SEO Small Tools: The Free SEO Toolbox

How free SEO tools help you find and fix errors

The value of a good SEO tool is that it turns something invisible into something you can act on. Search engines judge your site on hundreds of signals, most of which you cannot see just by looking at your pages in a browser. Your title tag might be truncated in results, your canonical tag might be pointing at the wrong URL, your sitemap might list pages that no longer exist, your structured data might contain a syntax error that stops it appearing as a rich result. All of these are silent failures — nothing on the page looks broken, but you are quietly losing clicks, crawl budget or eligibility for enhanced listings.

A focused tool exposes exactly one of those signals and tells you whether it is healthy. Because each tool checks a single thing, the feedback is specific: not "your SEO score is 68", but "your meta description is 210 characters and will be cut off — aim for around 155". That specificity is what makes free tools genuinely useful. A single vague score gives you nothing to do; a concrete finding gives you a task. Work through the findings, correct each one, and the aggregate effect on how search engines understand your site can be substantial.

The tools in this collection fall into natural groups that map onto the way SEO itself is structured. On-page tools look at the content and markup of individual pages. Technical tools look at how crawlable and well-built the site is as a whole. Off-page and backlink tools help you plan and understand the links pointing at you. Keyword and content tools help you target the right topics. Local tools handle the specifics of ranking in a place. Domain tools assess a site at a high level. Developer and utility tools handle the encoding, formatting and conversion tasks that come up constantly in technical SEO work. And a set of calculators handles the marketing maths — ROI, cost per click, conversion rate — that surrounds every campaign. The sections below take each group in turn.

How search engines actually work

To use SEO tools well, it helps to understand what they are ultimately serving. Search engines do three distinct jobs — crawling, indexing and ranking — and almost every SEO error is a failure at one of these three stages. When you know which stage a problem belongs to, the right tool and the right fix become obvious.

Crawling: can search engines reach your pages?

Crawling is the discovery stage. Automated programs called crawlers or spiders follow links from page to page and from site to site, fetching the HTML of each page they find. They discover new pages through internal links, through links from other sites, and through your XML sitemap. If a page has no links pointing to it and is not in your sitemap, crawlers may never find it. And if your robots.txt tells crawlers to stay out of a section, they will not fetch those pages at all. This is why robots.txt mistakes and orphaned pages with no internal links are such common, silent causes of pages simply not appearing in search — the crawl never happened. Tools that check robots.txt, trace redirects and find broken links all serve the crawling stage: they make sure search engines can actually reach what you want them to see.

Indexing: do search engines store and understand your pages?

Once a page is crawled, the search engine decides whether to add it to its index — the vast database of pages it can show in results — and works out what the page is about. This is where your title, headings, content and structured data do their work: they tell the engine the page's topic and quality. A page can be crawled but not indexed, for several reasons: a noindex directive telling the engine to leave it out, a canonical tag pointing at a different URL so the engine indexes that one instead, or content so thin or duplicated that the engine decides it is not worth storing. Tools that analyse meta tags, reveal canonical directives, measure content and validate structured data all serve the indexing stage: they make sure that once a page is found, it is understood correctly and kept in the index.

Ranking: which indexed page wins for a given search?

When someone searches, the engine selects from its index the pages it judges most relevant and trustworthy for that query, and orders them. Ranking considers hundreds of signals: how well the content matches the searcher's intent, the quality and relevance of the links pointing at the page, the page's speed and mobile-friendliness, and much more. This is the stage where content quality, keyword targeting and backlinks matter most — and the stage where no tool can promise a result, because ranking is competitive and largely outside your direct control. What tools can do is make sure you are not losing rank to fixable problems: a slow page, a poorly-targeted title, an unnatural link profile. They clear the obstacles so your genuine relevance and authority can be recognised.

Why this matters for choosing a tool

When something is wrong, ask which stage it belongs to. Is the page not appearing at all? That is usually crawling or indexing — check robots.txt, noindex and canonicals. Is it indexed but ranking poorly? That is the ranking stage — look at content quality, intent match, page speed and links. Framing problems this way turns a vague worry ("my SEO is bad") into a specific diagnosis you can take to the right tool. The whole toolbox is organised, in effect, around these three stages.

On-page SEO tools

On-page SEO is everything you control directly on a page: the title tag, the meta description, the heading structure, the body content, the internal links and the structured data. It is the most immediately fixable part of SEO, because you own every element and can change it in minutes. It is also where the most common and costly mistakes live — a duplicated title across a hundred pages, an H1 that says nothing about the topic, a meta description left blank so Google writes its own.

Titles and meta descriptions

Your title tag and meta description are the first thing a searcher sees, before they ever reach your site. The title is one of the strongest on-page ranking signals and the single biggest influence on whether someone clicks. The description does not directly affect ranking, but a compelling one dramatically improves click-through rate. Use the Meta Tags Analyzer to pull the real title, description, canonical and robots directive straight from a page's HTML and flag anything outside the recommended length ranges. Use the SERP Snippet Preview to see exactly how your listing will render in Google as you type, so you can tune the wording and length before publishing. When you are writing from scratch, the Meta Tag Generator and Meta Description Generator give you a well-formed starting point with live character counts.

Headings and content structure

A clear heading hierarchy helps both readers and search engines understand what a page is about. There should be exactly one H1 that states the page's main topic, with H2s for major sections and H3s nested beneath them — never skipping levels or using headings purely for visual size. The on-page analysis tools check whether your target keyword actually appears where it matters: in the title, the H1, the URL, the opening text and the meta description. If your page is about a topic but never mentions it in these prominent places, you are making search engines guess.

Word and content analysis

The Word Counter measures length, reading time and readability, which matters because thin pages rarely satisfy a searcher's intent and long, unstructured walls of text rarely get read. Content that is comprehensive, well-organised and genuinely answers the question tends to perform; content padded to hit an arbitrary word count does not. The tools help you judge whether a page has enough substance to compete, without encouraging you to stuff it.

Internal linking and structured data

Internal links pass authority around your site and help search engines discover and understand the relationships between pages. Every important page should be reachable through internal links with descriptive anchor text. Structured data (schema markup) can make your pages eligible for rich results — star ratings, FAQ drop-downs, breadcrumb trails. The FAQ Schema Generator and LocalBusiness Schema Generator produce valid JSON-LD you can drop into a page, and the guidance on each tool is clear that you should only mark up content that is actually visible on the page, because marking up content that is not there is against search-engine guidelines.

Technical SEO tools

Technical SEO is about making sure search engines can crawl, render, understand and index your site efficiently. Get it wrong and it does not matter how good your content is — if crawlers cannot reach a page, or are told not to index it, or hit an endless chain of redirects, that content will never rank. Technical issues are the most dangerous kind precisely because they are silent: a single stray line in a configuration file can remove an entire section of a site from search with no warning anywhere.

Robots.txt and crawl control

The robots.txt file at the root of a domain tells crawlers which parts of the site they may visit. It is powerful and unforgiving: a misplaced "Disallow: /" can block the whole site. The Robots.txt tester fetches a site's real robots.txt, parses the rules and lets you check whether a specific path is allowed or blocked for a given crawler, so you can confirm you are not accidentally hiding pages you want indexed — or failing to hide ones you do not. The Robots.txt Generator helps you build a correct file from scratch with the right syntax.

Sitemaps, canonicals and indexation

An XML sitemap lists the URLs you want search engines to know about; it should contain only canonical, indexable, live pages — not redirects, error pages or duplicates. Canonical tags tell search engines which version of a page is the master when several URLs show similar content, preventing duplicate-content dilution. Getting canonicals right is one of the subtler technical skills, and one of the most common places to slip: a canonical pointing at the wrong URL, or at the homepage on every page, can quietly suppress a whole site. The analysis tools surface the canonical a page actually declares so you can verify it is correct.

Redirects and status codes

When a page moves, a proper 301 redirect passes its ranking signals to the new location. Problems arise with redirect chains (A redirects to B redirects to C), redirect loops, and redirects that return the wrong status code. The Redirect Checker follows a URL's redirect path and shows each hop and status code, so you can flatten chains to a single hop and catch loops before they waste crawl budget and slow users down. Checking for broken links — internal or outbound — matters too, because a page full of 404s is a poor experience and wastes the crawl.

Speed, mobile and rendering

Page speed and mobile-friendliness are both ranking factors and, more importantly, major influences on whether visitors stay. While the precise lab scores that services like PageSpeed Insights produce require Google's own testing infrastructure to generate honestly, there is a great deal you can do yourself: compress and correctly size images, minify your CSS and JavaScript, remove render-blocking resources and unused code. The developer tools in this toolbox — the CSS Minifier and HTML Formatter among them — help with the hands-on part of making pages lighter and faster.

Off-page and backlink tools

Off-page SEO is everything that happens away from your own site that influences how search engines perceive it — overwhelmingly, this means backlinks. A link from another site is a vote of confidence, and links from relevant, trusted sites remain one of the strongest ranking signals there is. Off-page work is harder than on-page work because you do not control it: you have to earn links through genuinely useful content, relationships and outreach. The tools here help you plan and understand that effort rather than pretending to manufacture it.

Understanding and planning backlinks

Because the proprietary link metrics (Domain Rating, Trust Flow and similar) are paywalled and cannot be produced honestly for free, the backlink tools in this toolbox focus on planning and strategy rather than displaying fabricated scores. The backlink and campaign planning calculators help you think through how much link-building effort a competitive goal realistically needs, frame a budget, and set expectations — using transparent, clearly-labelled heuristics rather than pretending to know the exact number of links required to rank, which no honest tool can tell you.

Anchor text and link profiles

The anchor text of your backlinks — the clickable words that link to you — sends a signal about what your page is about. A healthy profile is varied and natural: mostly branded and generic anchors, with exact-match keyword anchors used sparingly. An unnatural profile, heavy with the same commercial keyword, is a classic over-optimisation pattern that can trigger problems. The anchor-text distribution tools help you think about and plan a natural-looking mix rather than concentrating risk in one phrase.

Earning links the right way

The single most important principle of off-page SEO is that the best links are earned, not bought in bulk from low-quality sources. Content that genuinely deserves to be referenced — original research, useful tools, clear guides — attracts links naturally over time. Digital PR, guest contributions to reputable sites in your field, and being genuinely helpful in your community all build a link profile that search engines trust. Shortcuts that manufacture links at scale from irrelevant sites tend to be a liability, not an asset.

Keyword research and content tools

Keyword research is how you discover what your audience is actually searching for, so you can create content that meets that demand. Done well, it aligns your content with real intent; done badly, it produces pages targeting phrases nobody searches, or stuffed with keywords in a way that repels readers. The keyword and content tools here help with the parts of research that can be done honestly without a paid search-volume database.

Generating keyword ideas and variations

The Long-Tail Keyword Generator and related tools help you expand a seed topic into the longer, more specific phrases that make up the majority of all searches. Long-tail keywords are less competitive and usually convert better because they capture more specific intent — someone searching "best running shoes for flat feet" is closer to buying than someone searching "shoes". Building out a set of these variations gives you a content roadmap: each becomes a potential page or section that answers a specific question.

Search intent and content targeting

Behind every search is an intent — informational (learning), navigational (finding a specific site), commercial (researching before buying) or transactional (ready to act). Matching your content to the dominant intent for a keyword is essential: a product page will not rank for an informational query, and a blog post will not rank for a transactional one. The keyword intent classifier applies transparent, rule-based pattern matching to suggest the likely intent behind a phrase — clearly labelled as a quick sanity check, not a trained model — so you can align your page type to what searchers actually want.

Keyword density and on-page relevance

Once you have chosen a target, your content should mention it and its natural variations enough to be clearly relevant, but never so much that it reads as stuffed. There is no magic density percentage to hit; the goal is natural language that a human would write about the topic. The word and content analysis tools help you check that your keyword appears in the places that matter — title, headings, opening text — without tipping into repetition that harms readability and can look manipulative.

Writing and content utilities

A cluster of writing tools speeds up everyday content work: the Case Converter fixes capitalisation, the Remove Extra Spaces and Duplicate Line Remover tools clean up messy pasted text, the Find and Replace tool makes bulk edits, and the Lorem Ipsum Generator produces placeholder copy for layouts. The Blog Title Generator offers template-based headline ideas to get you started. None of these pretend to write your content for you with AI; they are honest, mechanical utilities that remove friction from the writing process.

Local SEO tools

Local SEO is how a business ranks for searches with local intent — "plumber near me", "best coffee in the city centre", or any query where the searcher wants a nearby result. It has its own signals and its own set of common mistakes, and for any business that serves customers in a physical area it is often the highest-return form of SEO there is. The local tools here handle the specifics.

NAP consistency

NAP stands for Name, Address and Phone number, and its consistency across the web is a foundational local-SEO signal. If your business is listed with slightly different addresses or phone formats across your website, your Business Profile and various directories, search engines become less confident that all those listings refer to the same real business — and that uncertainty can hold back your local rankings. The NAP Consistency Checker and NAP Formatter help you settle on one canonical format and apply it everywhere, so every citation reinforces the same information.

Local structured data and meta

LocalBusiness structured data tells search engines the concrete facts about your business — its name, address, hours, phone and type — in a machine-readable form that can power local rich results. The LocalBusiness Schema Generator produces valid JSON-LD for this. The Local Meta Description Generator helps you write descriptions that naturally include your service and target city, which is exactly the kind of specific, locally-relevant wording that performs for geographic searches. City and service keyword generators help you plan out location-specific pages without creating thin, near-duplicate doorway pages, which search engines penalise.

Building local relevance honestly

Beyond the technical signals, local ranking rewards genuine local relevance: real reviews from real customers, accurate categories on your Business Profile, and content that actually serves your area. The tools help you get the structured, technical parts right; the lasting results come from being a genuinely established, well-reviewed business in your location, which no tool can fake on your behalf.

Domain and website analysis tools

Sometimes you need to assess a site — your own or a competitor's — at a higher level than a single page. Domain tools look at signals that describe a whole site or domain: how long it has been registered, whether its basic security and configuration are sound, and how its pages present themselves to search engines.

Domain trust signals

Rather than showing a fabricated authority score, the Domain Trust Signals tool checks things that genuinely correlate with a trustworthy domain and are all real and verifiable: the domain's registration age, whether its SSL certificate is valid, whether sensible security headers are configured, and whether it publishes a robots.txt and sitemap. None of this replaces a full backlink audit, but all of it is honest — and a domain that fails several of these basic checks has real problems worth fixing regardless of any proprietary metric.

Domain age and history

A domain's age is a modest signal in its own right, but it is genuinely informative when you are evaluating a domain you might acquire or a competitor you are sizing up. The Domain Age Checker reports registration data so you can see how established a domain is. Age alone does not make a site rank, but a long, consistent history is one input among many when you assess a domain's standing.

Comparing and auditing pages

The duplicate-content and meta-comparison tools let you compare two URLs' titles and descriptions to see how similar they are, which is useful for spotting accidental duplication across your own pages or understanding how a competitor has positioned a page. Used across a set of pages, these checks help you ensure every important page is distinct and well-targeted rather than competing with itself.

Developer and utility tools

Technical SEO and web work throw up a constant stream of small encoding, formatting and conversion tasks. Having reliable, private, browser-based tools for these saves time and avoids pasting sensitive data into questionable websites. This toolbox includes a solid set of developer and utility tools, all of which run entirely in your browser.

Formatting, validating and minifying code

The JSON Formatter and JSON Viewer make working with API responses and structured data far easier — the formatter re-indents and validates, while the viewer renders a collapsible, colour-coded tree you can explore. The HTML Formatter beautifies or minifies markup, and the CSS Minifier strips comments and whitespace to shrink stylesheets for faster loading, reporting exactly how many bytes it saved. Smaller, cleaner code contributes directly to the page-speed side of technical SEO.

Encoding and conversion

The URL Encoder/Decoder handles the percent-encoding that query strings and tracking parameters require. The Base64 Encoder/Decoder and HTML Entity Encoder cover common encoding needs. The Text to Binary and Binary to Text converters use standard UTF-8 encoding and are useful for learning and debugging how text is actually stored. The Timestamp Converter translates between human dates and Unix time, and the HEX to RGB converter bridges the two most common colour formats in web work.

Testing and building

The Regex Tester lets you build and check regular expressions against sample text with live match highlighting, using your browser's native JavaScript engine so behaviour matches real code. The UTM Campaign Builder assembles correctly-formatted tracking URLs so your analytics attributes traffic properly — a small thing that, done wrong, quietly corrupts your marketing data. The Invisible Character Tool detects hidden Unicode characters (zero-width spaces, byte-order marks, non-breaking spaces and more) that can sneak into copied text and cause baffling display and data problems.

Calculators for marketers and SEOs

SEO and digital marketing are full of everyday maths: working out a percentage change in traffic, the ROI of a campaign, the cost per click of an ad, or the conversion rate of a landing page. The calculators here are genuinely functional and mathematically exact — they compute in your browser with no rounding beyond display and no invented inputs.

Marketing and advertising maths

The CPM Calculator works with the cost of a thousand ad impressions and solves for whichever value you are missing. The CPC and CTR Calculator turns spend and clicks into cost per click and click-through rate. The Conversion Rate Calculator turns visitors and conversions into a rate and a cost per conversion — the single most important efficiency metric for most sites. The ROI Calculator expresses return on any investment as a clear percentage and net gain. Together these cover the numbers you need to judge whether marketing effort is paying off.

Everyday and financial calculators

Beyond marketing, the toolbox includes broadly useful calculators: a Percentage Calculator that handles the three common percentage questions, a Discount Calculator for sale prices, an Age Calculator that is leap-year accurate, an Hours Calculator that handles overnight shifts and breaks, a Loan Calculator using proper amortisation, a Compound Interest Calculator that models regular contributions, a Profit Margin Calculator that clearly separates margin from markup, and a BMI Calculator that computes the standard formula while being clear that it is a screening indicator and not a medical diagnosis. Each is accurate, transparent about its method, and honest about its limitations.

How to run a full SEO audit with free tools

Individually, each tool fixes one thing. Used together in sequence, they let you run a genuine audit of a page or a site. Here is a practical workflow that moves from the highest-impact, easiest fixes to the deeper technical ones. You do not need to do all of it at once — even the first few steps will catch the most common problems.

Step 1 — Check the page's first impression in search

Start with how the page appears in Google. Run the Meta Tags Analyzer to pull the real title, description, canonical and robots directive, and check the lengths. Then use the SERP Snippet Preview to see the listing as a searcher would. Fix any title that is truncated or duplicated, write a compelling description if one is missing, and confirm the canonical points where it should. This single step resolves a surprising share of everyday on-page problems.

Step 2 — Verify the page can be crawled and indexed

Confirm the page is not accidentally blocked. Check the site's robots.txt with the tester to make sure the path is allowed, and confirm the robots meta directive is not set to noindex on a page you want ranked. Check that the canonical tag is self-referencing (or correctly pointing at the master version) rather than accidentally pointing elsewhere. These checks catch the silent failures that keep good pages out of the index entirely.

Step 3 — Trace redirects and hunt broken links

If the page has moved or links to other pages, run the Redirect Checker to flatten any redirect chains to a single hop and catch loops. Check for broken internal and outbound links, because 404s waste crawl budget and frustrate visitors. Clean navigation and working links are basic hygiene that pays off across the whole site.

Step 4 — Assess content quality and targeting

Use the Word Counter and on-page analysis to judge whether the content has enough substance and whether the target keyword appears in the title, H1, URL and opening text. Confirm the heading hierarchy is logical, with a single clear H1. Make sure the page genuinely answers the intent behind its target query rather than skirting around it.

Step 5 — Validate structured data and enhance the listing

If the page should be eligible for rich results, generate and add the appropriate structured data — FAQ, LocalBusiness or otherwise — using the schema generators, and only mark up content that is actually on the page. Valid schema can earn you a more prominent, more clickable listing.

Step 6 — Lighten and speed up the page

Finally, tackle performance. Compress and correctly size images, minify your CSS and JavaScript with the developer tools, and remove unused code and render-blocking resources. A faster page is better for both rankings and the humans using it. Run through this sequence for your most important pages first, then work down your priority list.

Common SEO errors and how to fix them

Most sites share the same handful of recurring problems. Here is a practical catalogue of the errors these tools most often surface, what each one costs you, and how to fix it. Work through the list against your own site and you will likely find several to correct.

Missing or duplicated title tags

A page with no title, or the same title as many other pages, confuses search engines and wastes your strongest on-page signal. Fix it by writing a unique, descriptive title for every important page that includes its main topic and stays within the length that displays fully in results. The Meta Tags Analyzer and SERP Preview make this quick to check and tune.

Blank or over-long meta descriptions

Leaving the description blank lets Google write its own, often pulling an unflattering sentence from the page. Writing one that is too long gets it truncated. Fix it by writing a concise, compelling description of around 155 characters for each key page, previewing it before you publish.

Accidental noindex or robots.txt blocking

A stray noindex tag or an over-broad robots.txt rule can remove pages — or an entire site — from search with no visible error. This is one of the most damaging and most common technical mistakes. Fix it by checking the robots.txt with the tester and confirming the robots meta directive on important pages allows indexing.

Incorrect canonical tags

Canonicals pointing at the wrong URL, or at the homepage on every page, can suppress rankings across a site. Fix it by ensuring each page's canonical points at its own master URL, and by checking the declared canonical with the analysis tools.

Redirect chains and loops

Chains of redirects slow users down and dilute the signals a redirect is supposed to pass; loops break the page entirely. Fix them by flattening every chain to a single 301 hop using the Redirect Checker to trace the path.

Broken internal and outbound links

Links to pages that return 404 harm the user experience and waste crawl budget. Fix them by finding and updating or removing broken links, and by keeping your internal linking current as pages move.

Thin or duplicated content

Pages with little substance, or several pages covering nearly the same thing, compete with each other and rarely rank. Fix thin pages by expanding them into genuinely comprehensive resources, and consolidate duplicates or differentiate them clearly, checking similarity with the comparison tools.

Poor heading structure

Multiple H1s, skipped heading levels, or headings used purely for visual size make a page harder to understand. Fix it by using exactly one descriptive H1 and a logical nested hierarchy of H2s and H3s.

Missing or invalid structured data

Schema that is absent, or present but containing a syntax error, means no rich result. Fix it by generating valid JSON-LD with the schema tools and marking up only content that is genuinely on the page.

Slow-loading, heavy pages

Large uncompressed images and bloated code make pages slow, hurting both rankings and conversions. Fix it by compressing and sizing images correctly and minifying CSS and JavaScript with the developer tools.

Inconsistent NAP for local businesses

Different business names, addresses or phone formats across the web weaken local rankings. Fix it by standardising on one format with the NAP Formatter and applying it consistently everywhere your business is listed.

Hidden invisible characters in content

Zero-width spaces and other invisible Unicode characters can creep into copied text and cause display glitches, broken searches and data problems that are maddening to diagnose because nothing is visibly wrong. Fix it by scanning and cleaning text with the Invisible Character Tool before you publish or import it.

Broken analytics from bad tracking URLs

Malformed campaign URLs cause your analytics to misattribute traffic, quietly corrupting the data you use to make decisions. Fix it by building tracking links correctly with the UTM Campaign Builder so every parameter is properly formatted.

How to prioritise which SEO errors to fix first

A site audit often surfaces more issues than you can tackle at once, and treating them all as equally urgent is a recipe for spending a day on trivia while a serious problem lingers. The key is to prioritise by impact and effort. Some fixes are high-impact and low-effort — do these first, immediately. Others are high-impact but take real work — schedule them. Low-impact fixes, whatever their effort, come last.

At the top of any priority list are problems that stop pages being found or indexed at all, because nothing else matters if a page is invisible. An accidental noindex on an important page, an over-broad robots.txt block, or a canonical pointing at the wrong URL can each remove pages from search entirely, and each is usually quick to fix once identified. These are the classic high-impact, low-effort wins: check them first with the robots.txt and meta analysis tools and correct any you find the same day.

Next come issues that affect many pages at once. A title-tag pattern duplicated across a whole section, a redirect chain in your main navigation, or a structured-data error on a template all multiply across every page that uses them, so fixing the pattern once fixes hundreds of pages. Template-level and site-wide problems punch above their weight precisely because of that multiplication, so they rank high even when each individual instance seems minor.

After that, address page-level content and targeting on your most important pages — the ones that already get traffic or that you most want to rank. Improving the title, intent match, depth and internal linking of a page that is close to ranking well often yields more than perfecting a page nobody visits. Finally, work through the long tail of smaller issues: a missing alt attribute here, a slightly long description there. They are worth fixing, but only once the structural and high-traffic work is done. This impact-first order means that even if you only ever complete the top of your list, you will have captured most of the available benefit.

Measuring SEO progress the honest way

Once you start fixing issues, you will want to know whether it is working — and here, too, honesty matters more than a reassuring number. The temptation is to watch a single composite "SEO score" and celebrate when it rises. But those scores are made up of dozens of weighted checks, and a rising score can mask a falling one that matters more, or reward cosmetic changes that do nothing for real visibility. Better to track things that genuinely reflect performance.

The most meaningful signals come from your own analytics and search data: how many pages are indexed, how much organic traffic you receive, which queries bring people to you, your click-through rate from search, and — ultimately — conversions from organic visitors. These are real outcomes, not proxies. When you fix a batch of issues, watch whether indexation improves, whether impressions and clicks for the affected pages rise, and whether the pages you worked on start appearing for the queries you targeted. That is the honest measure of progress.

Give changes time to take effect. Search engines need to re-crawl and re-evaluate pages after you edit them, and rankings rarely move the same day. Judge a change over weeks, not hours, and be wary of attributing every fluctuation to your last edit — search results move for many reasons, including changes by competitors and by the search engines themselves. Keep a simple record of what you changed and when, so you can connect cause and effect over time rather than guessing.

Above all, resist the pull of vanity metrics. A tool that shows your "authority" ticking upward tells you nothing you can bank; real traffic, real rankings for real queries, and real conversions tell you everything. Use the toolbox to remove the errors that hold pages back, then measure success by what actually happens in search and on your site — not by a number designed to make you feel good.

Best practices for using SEO tools

Tools are only as good as the way you use them. A few principles will get you far more value from any SEO toolbox, this one included.

Fix issues in order of impact, not in the order you find them. A page blocked from indexing matters more than a slightly long meta description; a redirect loop matters more than a missing alt attribute. Triage first, then work down. Check before you publish, not just after — verifying the title, description, headings, links and schema of a new page before it goes live is far cheaper than fixing problems once they are indexed. Re-check periodically, because sites drift: content gets edited, pages move, plugins change output, and issues that were fixed can quietly return. A regular sweep for broken links, redirect chains and indexation problems keeps a site healthy over time.

Treat tool output as a diagnosis, not a prescription for gaming search engines. The goal is to remove genuine errors so your real content and links can be recognised, not to chase a number for its own sake. And trust real, verifiable checks over confident-looking scores; a tool that tells you your title is 71 characters is giving you a fact you can act on, while a tool that gives you a single mysterious "authority" number out of a hundred is giving you something you cannot verify and should not rely on.

Common mistakes to avoid

Just as there are best practices, there are recurring traps. Avoid chasing a single "SEO score" as if it were the goal — these composite scores compress dozens of unrelated signals into one number that hides what actually needs fixing. Avoid trusting free tools that display proprietary metrics like Domain Authority or keyword search volume for free, because those numbers are either scraped against terms of service or invented; a tool willing to fake one number may be faking others. Avoid over-optimising in pursuit of tool feedback — stuffing a keyword to raise a density figure, or piling exact-match anchors onto every link, creates the very unnatural patterns that search engines penalise.

Avoid fixing trivial issues while ignoring serious ones: a perfect meta description on a page that is accidentally set to noindex helps nobody. Avoid treating one audit as a permanent state; SEO health is ongoing, not a box you tick once. And avoid pasting genuinely sensitive data into online tools you do not trust — one of the reasons the tools here run in your browser is precisely so your text and code never leave your device.

Who these tools are for

The toolbox is built to be useful across the full range of people who work on websites. Business owners and website owners use it to keep their own sites free of the technical and on-page mistakes that hold them back, without needing to hire out every small task. Bloggers and content creators use it to polish each post before publishing — checking the title, description, headings and readability so their writing gets the visibility it deserves.

Digital marketers use the analysis tools and calculators to audit landing pages, build clean tracking URLs and measure the ROI, cost per click and conversion rate of their campaigns. SEO professionals and agencies use the tools to run fast checks across many client pages, standardise NAP data, validate structured data and trace redirects at scale. Developers use the formatters, minifiers, encoders and the regex tester constantly in the course of building and shipping sites. And students and people learning SEO use the tools to see how each signal works in practice, with clear explanations on every page. Whatever your role, the tools are free, immediate and honest about what they can and cannot tell you.

Privacy: how our tools handle your data

Privacy is a first-class concern in this toolbox, not an afterthought. The great majority of the tools — every calculator, every text and code utility, the converters, the formatters and the generators — run entirely in your browser using JavaScript. That means the text, code or numbers you enter are processed on your own device and are never uploaded to our server or stored anywhere. You can use them on confidential material with confidence.

A small number of tools have to fetch a live web page to do their job — for example, checking another site's meta tags, robots.txt or redirects. In those cases the only thing sent is the public URL you type in; your private content is not involved. Every tool page states plainly how it processes your data, so you always know what is happening. We do not run hidden uploads, we do not sell data, and we do not pad the toolbox with fake reviews, invented user counts or fabricated ratings. The tools earn their place by being genuinely useful and honest.

A tour of every tool category

The toolbox is organised into categories so you can go straight to the kind of check you need. Here is what each category contains and when you would reach for it. Every tool named below has its own dedicated page with full instructions, worked examples and its own FAQ.

Authority and trust tools

These assess a domain honestly, without inventing a score. The Domain Trust Signals tool checks real, verifiable indicators — registration age, valid SSL, security headers, and the presence of a robots.txt and sitemap — instead of showing a fabricated Domain Authority number. It is the honest answer to "how trustworthy is this domain", giving you concrete facts you can verify rather than a mysterious figure out of a hundred.

Website audit tools

This group finds the concrete faults on a page or site. The On-Page SEO Checker and Heading Structure Checker examine how a page is built; the Image Alt Checker finds images missing descriptive alt text; the Broken Link Checker and Link Analyzer surface dead links and examine your linking; the Duplicate Content Checker compares pages for unwanted similarity; and the Text-to-HTML Ratio tool flags pages that are mostly code and very little content. Together they form the backbone of a hands-on site audit.

Backlink tools

Because proprietary link metrics cannot be produced honestly for free, this category focuses on planning and structure. The Backlink Anchor Checker and Anchor Text Distribution tools help you think about a natural, varied anchor profile; the Backlink Campaign Calculator, Required Backlinks Estimator and Guest Post ROI Calculator help you plan effort and budget using transparent, clearly-labelled heuristics — never pretending to know the exact number of links needed to rank, which no honest tool can claim.

Domain tools

For assessing domains at a high level: the Domain Age Checker reports how long a domain has been registered, and the SSL Checker verifies a site's certificate. These give you real, checkable facts when you are evaluating a domain to buy, sizing up a competitor, or confirming your own site's basics are sound.

Technical SEO tools

This is the largest and most important group for keeping a site crawlable and indexable. The Robots.txt Tester and Robots.txt Generator handle crawl control; the XML Sitemap Validator checks your sitemap is well-formed; the Redirect Checker traces redirect chains and loops; the HTTP Header Checker inspects the response headers a server sends; the Schema Validator checks your structured data; and DNS and network tools — DNS Lookup, IP Lookup, Reverse DNS Lookup — help diagnose the infrastructure layer. These are the tools that catch the silent, site-wide failures.

Content tools

For assessing and improving the substance of a page: the Word Counter measures length, reading time and readability; the Keyword Density Checker shows how often terms appear so you can stay relevant without stuffing; and the Duplicate Content and similarity checks help ensure each page is distinct. These tools keep your content substantial, well-targeted and free of accidental duplication.

Keyword tools

For planning what to target: the Long-Tail Keyword Generator and City-Service Keyword Generator expand a seed idea into specific, lower-competition phrases, and the Keyword Intent Classifier applies transparent rule-based matching to suggest whether a phrase is informational, commercial or transactional — clearly labelled as a quick sanity check rather than a trained model. They give you a content roadmap grounded in real search behaviour, without inventing search-volume numbers.

Local SEO tools

For businesses that serve a place: the NAP Consistency Checker and NAP Formatter help you standardise your Name, Address and Phone across the web; the LocalBusiness Schema Generator produces valid local structured data; and the Local Meta Description Generator writes descriptions that naturally include your service and city. These handle the specifics that decide whether you show up for "near me" searches.

SEO agency tools

For running SEO as a service: the SEO Campaign Planner and SEO Pricing Calculator help you scope work and price it transparently. These are planning aids for professionals managing multiple clients and campaigns, built on clear assumptions rather than black-box numbers.

Text tools

Everyday text utilities that speed up content work: the Case Converter fixes capitalisation; Remove Extra Spaces and the Duplicate Line Remover clean messy pasted text; the Line Sorter orders lists; Find and Replace makes bulk edits; the Text Reverser flips text; the Lorem Ipsum Generator produces placeholder copy; the Blog Title Generator offers template-based headline ideas; and the Invisible Character Tool detects hidden Unicode characters that cause baffling problems. All run privately in your browser.

Developer tools

For the technical tasks that come up constantly: the JSON Formatter and JSON Viewer make structured data readable; the HTML Formatter beautifies or minifies markup; the CSS Minifier shrinks stylesheets and reports the bytes saved; the Regex Tester checks patterns with live highlighting; the URL Encoder/Decoder, Base64 Encoder/Decoder and HTML Entity Encoder handle encoding; the Timestamp Converter bridges human dates and Unix time; and the Text to Binary and Binary to Text converters use standard UTF-8. Cleaner, lighter code feeds directly into faster pages.

Utility tools

General-purpose helpers, including the binary and encoding converters, that support both SEO work and everyday web tasks. Like the rest of the toolbox, they process everything locally in your browser so your data stays private.

Marketing tools

For campaign tracking and measurement: the UTM Campaign Builder assembles correctly-formatted tracking URLs so your analytics attributes traffic properly — a small detail that, done wrong, quietly corrupts your marketing data for months.

Design and colour tools

For the visual side of building pages: the Contrast Checker tests colour combinations against accessibility standards; the CSS Gradient Generator produces gradient code; the HEX to RGB Converter bridges colour formats; the Aspect Ratio Calculator helps size images and video correctly; and the Social Media Image Guide gives the right dimensions for each platform. Accessible, correctly-sized visuals improve both usability and how your pages are perceived.

Calculators

Genuinely functional, mathematically exact calculators for marketers and everyone else: the Percentage, Discount, Age, Hours, Loan, Compound Interest, Profit Margin, ROI, CPM, CPC and CTR, Conversion Rate and BMI calculators. Each computes in your browser, is transparent about its formula, and is honest about its limitations — the BMI Calculator, for instance, is clear that it is a screening indicator and not a medical diagnosis.

Preview and social tools

To control how your pages appear when shared and searched: the SERP Snippet Preview shows your Google listing as you type, and the Social Preview Checker helps you see how a page will look when shared on social platforms. Getting these right improves click-through from both search and social.

SEO glossary of key terms

SEO has a vocabulary of its own. These plain-English definitions cover the terms you will meet most often while using the tools and reading about search optimisation.

Title tag

The HTML element that sets a page's title, shown as the clickable headline in search results and in the browser tab. One of the strongest on-page ranking signals and the biggest single influence on whether people click.

Meta description

A short HTML summary of a page. It does not directly affect ranking, but a compelling one improves click-through rate; if you leave it blank, the search engine writes its own from the page.

Heading tags (H1–H6)

HTML elements that structure content into a hierarchy. A page should have one descriptive H1 for its main topic, with H2s and H3s nested logically beneath it.

Canonical tag

An HTML signal that tells search engines which URL is the master version when several URLs show similar content, preventing duplicate-content dilution. A wrong canonical is a common, subtle cause of suppressed rankings.

Robots.txt

A plain-text file at a domain's root that tells crawlers which parts of the site they may visit. Powerful and unforgiving — a single stray rule can block an entire site.

Noindex

A directive that tells search engines not to include a page in their index. Useful for pages you deliberately want kept out of search, and dangerous when applied by accident to pages you want ranked.

XML sitemap

A file listing the URLs you want search engines to know about. It should contain only canonical, indexable, live pages — not redirects, duplicates or error pages.

Crawling

The process by which search engines discover pages by following links and reading sitemaps, then fetch their HTML. If a page cannot be crawled, it cannot be indexed or ranked.

Indexing

The process of storing and understanding a crawled page so it can appear in results. A page can be crawled but not indexed if it is set to noindex, canonicalised elsewhere, or judged too thin.

Ranking

The ordering of indexed pages for a given search, based on relevance, content quality, links, speed and many other signals. Competitive and largely outside your direct control.

SERP

Search engine results page — the page of results returned for a query. Optimising how your listing appears here (via the title, description and structured data) improves click-through.

301 redirect

A permanent redirect that sends users and search engines from an old URL to a new one and passes on most of the old page's ranking signals. The correct way to move a page.

302 redirect

A temporary redirect. Because it signals the move is not permanent, it does not pass ranking signals the way a 301 does — using it by mistake for a permanent move is a common error.

Structured data (schema)

Machine-readable markup, usually JSON-LD, that describes a page's content to search engines and can make it eligible for rich results such as FAQ drop-downs, star ratings and breadcrumbs. Only mark up content that is actually on the page.

Rich result

An enhanced search listing — with extra elements like ratings, FAQs or images — made possible by valid structured data. More prominent and more clickable than a plain listing.

Backlink

A link from another website to yours. Links from relevant, trusted sites are among the strongest ranking signals; low-quality or manipulative links can be a liability.

Anchor text

The visible, clickable words of a link. Anchor text signals what the linked page is about; a natural profile is varied, with exact-match keyword anchors used sparingly.

Domain Authority / Domain Rating

Proprietary third-party scores (from Moz and Ahrefs respectively) that estimate a domain's strength. They are built from private databases and available only through paid APIs — which is why no honest free tool can show them.

Crawl budget

The amount of crawling a search engine will do on your site in a given period. Wasting it on broken links, redirect chains and duplicate pages means important pages get crawled less often.

Keyword

A word or phrase people type into search. Choosing the right keywords aligns your content with real demand; the aim is to match the searcher's intent, not to repeat a phrase mechanically.

Long-tail keyword

A longer, more specific search phrase. Long-tail keywords are less competitive and usually convert better because they capture more precise intent.

Search intent

The goal behind a search — informational, navigational, commercial or transactional. Matching your page type to the dominant intent for a keyword is essential to ranking for it.

Keyword density

How often a keyword appears relative to total words. There is no ideal percentage; the goal is natural, relevant language, not hitting a number.

NAP

Name, Address and Phone number. Keeping these consistent across your site, your Business Profile and directories is a foundational local-SEO signal.

Alt text

A text description of an image, used by screen readers and search engines. Descriptive alt text improves accessibility and image SEO; missing alt text is a common, easily-fixed fault.

CTR (click-through rate)

The percentage of people who see your listing or ad and click it. Compelling titles and descriptions raise CTR from search; relevant ads raise it in advertising.

CPC (cost per click)

In paid advertising, the amount you pay for each click. Read alongside conversion rate, because cheap clicks that never convert are expensive overall.

CPM (cost per mille)

The cost of one thousand ad impressions — the standard unit for display and video advertising, useful for comparing placements of different sizes.

Conversion rate

The percentage of visitors who complete the action you want. Small improvements multiply the value of all your other marketing, which is why it is the metric to watch.

ROI (return on investment)

The gain from an investment expressed as a percentage of its cost. Always compare ROIs over the same time period, and be clear whether "return" means revenue or profit.

Open Graph

A set of meta tags that control how a page appears when shared on social platforms — the title, description and image in the preview card. Getting them right improves social click-through.

Organic traffic

Visitors who arrive from unpaid search results, as opposed to paid ads, social or direct visits. Growing organic traffic is the central goal of SEO and one of the truest measures of progress.

Impressions

The number of times your listing appears in search results, whether or not it is clicked. Rising impressions after a fix suggest a page is being shown for more queries.

Core Web Vitals

A set of Google metrics measuring real-world page experience — loading, interactivity and visual stability. Improving them benefits both rankings and the humans using your pages.

Mobile-first indexing

Google's practice of primarily using the mobile version of a page for indexing and ranking. It makes a fast, fully-featured mobile experience essential rather than optional.

Duplicate content

Substantially identical content appearing on more than one URL. It splits ranking signals and can leave pages competing with themselves; canonicals and consolidation are the usual fixes.

Internal link

A link from one page on your site to another. Internal links pass authority around your site and help search engines discover and understand how your pages relate.

Bounce and engagement

Signals about how visitors interact with a page after arriving. While not a simple ranking dial, content that genuinely satisfies intent tends to keep people engaged, which supports long-term performance.

Getting started with the toolbox

If all of this feels like a lot, remember that you do not need to do everything at once. The beauty of a collection of focused tools is that you can start anywhere and still make real progress. Pick one page that matters to you — your homepage, a key product or service page, or a post you want to rank — and run it through the first few steps of the audit workflow above. Check its title and description, preview its search listing, confirm it is not accidentally blocked, and trace any redirects. In fifteen minutes you will likely find and fix something worthwhile.

From there, let curiosity and need guide you. Publishing a new article? Preview the snippet and check the heading structure before it goes live. Launching a local business page? Standardise your NAP and generate LocalBusiness schema. Shipping a new template? Run the code through the formatters and minifiers, and validate the structured data. Planning a campaign? Use the calculators to model the ROI and build clean tracking URLs. Each tool solves a real problem the moment you have that problem, and each has its own page with step-by-step guidance if you want more detail.

Everything here is free, most of it runs privately in your browser, and none of it will ever show you a fabricated number to nudge you toward a purchase. Bookmark this hub, come back whenever a question arises, and work through the fixable issues one at a time. Fix the errors that hold your pages back, keep creating content that genuinely deserves to rank, and let the tools handle the technical detail so you can focus on the work that only you can do.

Frequently asked questions about our free SEO tools

Short answers to the questions people ask most often about using free online SEO tools to check a website and fix search-engine errors.