Die SEO-Toolbox

🛡️ Autorität & Vertrauen

Domain Trust Signals

A real, verifiable trust report: domain age, SSL status, security headers, and sitemap/robots presence — combined in one check. (Not a substitute for Moz DA or Ahrefs DR — those are paid, proprietary metrics we don't fabricate.)

Tool verwenden → 🏷️ Website-Audit

Meta Tags Analyzer

Check any page's title tag, meta description, canonical URL and robots directives for length and SEO issues.

Tool verwenden → 🤖 Website-Audit

Robots.txt Tester

Fetch and check any website's robots.txt, and test whether a specific path is allowed to be crawled.

Tool verwenden → 🗺️ Website-Audit

XML Sitemap Validator

Check that a sitemap URL is valid XML, see how many URLs it lists, and whether lastmod dates are present.

Tool verwenden → 📱 Website-Audit

Social Share Preview

See how a URL will look when shared on Facebook, LinkedIn or Twitter/X — pulls the real Open Graph and Twitter Card tags.

Tool verwenden → ⚖️ Website-Audit

Text-to-HTML Ratio Checker

Calculate how much of a page is visible text versus markup — a low ratio can be a thin-content signal.

Tool verwenden → 🧩 Website-Audit

Schema Markup Validator

Finds every JSON-LD structured-data block on a page, lists the schema types used, and flags missing required fields.

Tool verwenden → ✔️ Website-Audit

On-Page SEO Checker

Enter a page and your target keyword — see whether it appears in the title, H1, URL, meta description and opening text.

Tool verwenden → 📐 Website-Audit

Heading Structure Checker

See a page's full H1–H6 outline and catch structural issues like a missing H1, multiple H1s, or skipped heading levels.

Tool verwenden → 📑 Website-Audit

Duplicate Title/Meta Comparer

Compare two URLs' titles and meta descriptions to check how similar or duplicated they are.

Tool verwenden → ✅ Backlink-Tools

Backlink & Anchor Text Verifier

Paste a page URL and your domain — we'll confirm whether the link exists, show the exact anchor text, and whether it's dofollow.

Tool verwenden → 🔬 Backlink-Tools

Link Analyzer

Full breakdown of every link on a page: internal vs external counts, dofollow vs nofollow, and the external domains linked to.

Tool verwenden → 🔗 Backlink-Tools

Broken Link Checker

Scan a page's links and flag any that return an error (404, 500, etc). Checks up to 20 links per scan.

Tool verwenden → 📅 Domain-Tools

Domain Age Checker

Real WHOIS lookup showing when a domain was registered, its age, and expiry date.

Tool verwenden → 🌐 Domain-Tools

DNS Lookup

Look up a domain's A, AAAA, MX, TXT, NS and CNAME records in real time.

Tool verwenden → 📍 Domain-Tools

IP Lookup

Resolve a domain to its IPv4 and IPv6 addresses.

Tool verwenden → 🔄 Domain-Tools

Reverse DNS (PTR) Lookup

Look up the hostname an IP address resolves back to. (Note: this is a genuine PTR lookup, not a list of every domain hosted on that IP — no free source can honestly provide that.)

Tool verwenden → 🔒 Domain-Tools

SSL Certificate Checker

Check a domain's SSL certificate — issuer, validity dates, and days remaining before it expires.

Tool verwenden → 📡 Domain-Tools

HTTP Header Checker

See a page's full response headers — server, caching, security headers and more.

Tool verwenden → ↪️ Domain-Tools

Redirect Checker

Follow a URL's complete redirect chain step by step, and see the final destination and status code.

Tool verwenden → 🔍 Content-Tools

SERP Snippet Preview

See how your title and description will actually look in Google search results, live as you type — no page load needed.

Tool verwenden → 📊 Content-Tools

Keyword Density Checker

Paste your content or a URL to see keyword and keyphrase frequency, and spot over-optimization.

Tool verwenden → 📝 Content-Tools

Word Counter, Character Counter & Reading Time

Instant word count, character count, estimated reading time, and a Flesch reading-ease score as you type or paste.

Tool verwenden → 🧠 Content-Tools

Meta Title & Description Generator

Template-based title and meta description generator with live length meters. (Formula-based, not AI — we don't label template output as "AI-generated.")

Tool verwenden → 🎯 Keyword-Tools

Keyword Intent Classifier

A simple, transparent rule-based classifier that suggests whether a keyword looks informational, commercial, transactional or navigational.

Tool verwenden → 🌱 Keyword-Tools

Long-Tail Keyword Generator

Turn a seed keyword into dozens of long-tail variations using proven question, modifier and intent patterns — a starting list to research further.

Tool verwenden → 🏙️ Lokales SEO

City + Service Keyword Generator

Combine your services with a list of cities to instantly generate local keyword and landing-page ideas for local SEO campaigns.

Tool verwenden → ⚙️ Technisches SEO

Robots.txt Generator

Build a clean, valid robots.txt file with the right Allow/Disallow rules and sitemap line — copy-paste ready.

Tool verwenden → 🏢 Lokales SEO

LocalBusiness Schema Generator

Generate valid LocalBusiness JSON-LD structured data from your business details — helps local search understand your NAP info.

Tool verwenden → 📇 Lokales SEO

NAP Consistency Checker

Paste your business Name, Address and Phone as they appear on different listings to catch inconsistencies that hurt local SEO.

Tool verwenden → 📈 SEO-Agentur-Tools

Backlink Campaign Calculator

Plan a link-building campaign: enter your link target, cost per link and duration to see total cost, links per month, and a week-by-week pace.

Tool verwenden → 💰 SEO-Agentur-Tools

Guest Post ROI Calculator

Estimate the potential return of a backlink campaign from expected traffic, conversion rate and order value. All figures are clearly-labelled estimates.

Tool verwenden → 🗂️ SEO-Agentur-Tools

SEO Campaign Planner

Enter your website, target country, budget, link count and duration to generate a structured, phase-by-phase campaign outline you can copy.

Tool verwenden → 🧮 SEO-Agentur-Tools

Monthly SEO Budget Calculator

Break a monthly SEO budget across backlinks, content and technical work to see how many links and articles it realistically covers.

Tool verwenden → ⚓ Backlink-Tools

Anchor Text Distribution Planner

Enter your total link count to get a natural-looking anchor text mix (branded, exact, partial, generic, URL) so your profile does not look over-optimized.

Tool verwenden → 🎚️ SEO-Agentur-Tools

Required Backlinks Estimator

A rough, transparent estimate of how many quality links a campaign might target based on competition level — clearly labelled as a planning heuristic, not a guarantee.

Tool verwenden → 🖼️ Technisches SEO

Image Alt Text Checker

Scan a page and list every image, flagging any that are missing alt text — important for accessibility and image SEO.

Tool verwenden → 👁️ Text-Tools

Unsichtbare-Zeichen-Tool

Erkennt und entfernt unsichtbare bzw. versteckte Unicode-Zeichen wie Zero-Width-Spaces, BOM und geschützte Leerzeichen – vollständig in Ihrem Browser.

Tool verwenden → 🔤 Text-Tools

Case Converter

Convert text to UPPERCASE, lowercase, Title Case, or Sentence case instantly in your browser.

Tool verwenden → ✂️ Text-Tools

Remove Extra Spaces

Strip multiple spaces, leading/trailing spaces, and blank lines from text — great for cleaning copy-pasted content.

Tool verwenden → 📋 Text-Tools

Duplicate Line Remover

Remove duplicate lines from any list or block of text. Useful for cleaning keyword lists, URLs, and data exports.

Tool verwenden → 🔢 Text-Tools

Line Sorter

Sort lines of text alphabetically, reverse-alphabetically, or by length. Works entirely in your browser.

Tool verwenden → 🔍 Text-Tools

Find & Replace Tool

Find and replace text within a block of content — case-sensitive or case-insensitive, with an exact match count.

Tool verwenden → 🔁 Text-Tools

Text Reverser

Reverse text character by character, or reverse the order of lines — handy for quick text manipulations.

Tool verwenden → 📄 Text-Tools

Lorem Ipsum Generator

Generate placeholder Lorem Ipsum text of any length — words, sentences, or paragraphs — for design mockups and templates.

Tool verwenden → 🔗 Text-Tools

URL Encoder / Decoder

Encode or decode URL-encoded strings (percent-encoding). Useful for query strings, link building and redirect work.

Tool verwenden → 🔐 Text-Tools

Base64 Encoder / Decoder

Encode plain text to Base64 or decode Base64 back to readable text — runs entirely in your browser.

Tool verwenden → ⚙️ Entwickler-Tools

JSON Formatter & Validator

Paste raw JSON to format it with proper indentation, validate its syntax, and minify it. All processing happens in your browser.

Tool verwenden → 🌐 Entwickler-Tools

HTML Entity Encoder / Decoder

Encode special characters to HTML entities (& → &) or decode entities back to readable characters.

Tool verwenden → 📊 Marketing-Tools

UTM Campaign Builder

Build properly formatted UTM tracking URLs for Google Analytics campaigns — source, medium, campaign, term, and content.

Tool verwenden → 🕐 Entwickler-Tools

Unix Timestamp Converter

Convert Unix timestamps to human-readable dates and vice versa. Enter a timestamp or a date to see both formats.

Tool verwenden → 🎨 Design- & Farb-Tools

HEX ↔ RGB Colour Converter

Convert between HEX and RGB colour values instantly. Also shows the HSL equivalent. Works in your browser.

Tool verwenden → 🔲 Design- & Farb-Tools

Colour Contrast Checker

Check the contrast ratio between two colours against WCAG AA and AAA accessibility standards for text readability.

Tool verwenden → 🌈 Design- & Farb-Tools

CSS Gradient Generator

Create linear and radial CSS gradients with a visual preview and ready-to-copy CSS code. No libraries required.

Tool verwenden → 📐 Design- & Farb-Tools

Aspect Ratio Calculator

Calculate image dimensions while maintaining aspect ratio. Enter any two dimensions to find the third. Ideal for responsive design.

Tool verwenden → ✍️ Marketing-Tools

Blog Title Generator

Generate catchy blog title ideas from a topic using proven headline patterns. Template-based — clearly labelled, not AI.

Tool verwenden → 📱 Marketing-Tools

Social Media Image Size Guide

Current recommended image dimensions for Facebook, Instagram, Twitter/X, LinkedIn, Pinterest and YouTube — all in one reference.

Tool verwenden → 🗂️ Lokales SEO

NAP Formatter

Format your business Name, Address and Phone into a consistent NAP block ready to paste into citations, websites and directories.

Tool verwenden → 📍 Lokales SEO

Local Meta Description Generator

Generate localised meta descriptions using your business name, service, and target city. Template-based with live character count.

Tool verwenden → ❓ Technisches SEO

FAQ Schema Generator

Enter questions and answers to generate valid FAQPage JSON-LD structured data — copy-paste ready for your website.

Tool verwenden → ％ Rechner

Percentage Calculator

Work out percentages three ways: X% of Y, X is what % of Y, and percentage increase/decrease.

Tool verwenden → 🏷️ Rechner

Discount Calculator

Enter a price and a discount to see the amount saved and the final price you pay.

Tool verwenden → 🎂 Rechner

Age Calculator

Calculate exact age in years, months and days from a date of birth to any date.

Tool verwenden → ⏱️ Rechner

Hours Calculator

Add up hours and minutes between a start and end time, with an optional break deduction.

Tool verwenden → 🏦 Rechner

Loan Calculator

Calculate monthly loan repayments, total interest and total cost from amount, rate and term.

Tool verwenden → 📈 Rechner

Compound Interest Calculator

See how savings or investments grow over time with compound interest and regular contributions.

Tool verwenden → 💰 Rechner

Profit Margin Calculator

Turn cost and revenue into gross profit, profit margin % and markup %.

Tool verwenden → 📊 Rechner

ROI Calculator

Calculate return on investment as a percentage and net return from amount invested and returned.

Tool verwenden → 📣 Rechner

CPM Calculator

Work out CPM, total ad cost or impressions — solve for whichever value you're missing.

Tool verwenden → 🖱️ Rechner

CPC & CTR Calculator

Calculate cost-per-click, click-through rate and total spend for a PPC campaign.

Tool verwenden → 🎯 Rechner

Conversion Rate Calculator

Turn visitors and conversions into a conversion rate %, plus cost per conversion.

Tool verwenden → ⚖️ Rechner

BMI Calculator

Calculate Body Mass Index from height and weight (metric or imperial) with WHO category ranges.

Tool verwenden → 🌳 Entwickler-Tools

JSON Viewer

Paste JSON and explore it as a collapsible, colour-coded tree — great for large API responses.

Tool verwenden → 🧹 Entwickler-Tools

HTML Formatter & Beautifier

Re-indent messy or minified HTML into clean, readable markup with consistent nesting.

Tool verwenden → 🎨 Entwickler-Tools

CSS Minifier

Strip comments and whitespace from CSS to shrink file size for faster page loads.

Tool verwenden → 🔍 Entwickler-Tools

Regex Tester

Test JavaScript regular expressions against sample text and see every match highlighted live.

Tool verwenden → 0️⃣ Nützliche Tools

Text to Binary Converter

Convert text to binary (and back) using standard UTF-8 byte encoding.

Tool verwenden → 1️⃣ Nützliche Tools

Binary to Text Converter

Decode binary (space-separated 8-bit bytes) back into readable UTF-8 text.

Tool verwenden →