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Every page on this site, grouped by section. There are 47 tools, 8 reference tables, 10 guides and 12 supporting pages.
Binary Converters
Binary Converters, category overview
- Text to Binary Converter, Convert text to binary and back with ASCII, UTF-8 and UTF-16 support.
- Binary Decimal Hex Octal Converter, Four-way number base conversion with step-by-step working and BigInt support.
- Base64 Encoder & Decoder, Encode and decode Base64, including files, images and data URIs.
- SHA-256 Hash Generator, Generate SHA-1, SHA-256, SHA-384 and SHA-512 hashes with the Web Crypto API.
- Morse Code Translator, Translate text to Morse code with audio playback and adjustable speed.
- Hex to Text Converter, Convert hexadecimal to readable text and text to hex, byte by byte.
- Bitwise Operation Calculator, AND, OR, XOR, NOT and bit shifts with a live bit-by-bit visualisation.
- Binary Calculator, Add, subtract, multiply and divide binary numbers with carry-by-carry working.
- Roman Numeral Converter, Convert Roman numerals to numbers and numbers to Roman numerals.
- File Size Converter, Convert bytes, KB, MB, GB, TB between decimal (SI) and binary (IEC) units.
Text & Data Converters
Text & Data Converters, category overview
- JSON CSV XML YAML Converter, Convert between the four most common data interchange formats.
- Markdown to HTML Converter, Live Markdown preview with GitHub-flavoured syntax support.
- Text Case Converter, Fourteen case transformations including camelCase, snake_case and kebab-case.
- Text Diff & Compare Tool, Side-by-side and unified diff with line and word level comparison.
- URL Encoder & Decoder, RFC 3986 percent-encoding with batch mode and component breakdown.
- Word Counter & Text Statistics, Word, character, sentence and paragraph counts with reading time.
- Lorem Ipsum Generator, Generate placeholder paragraphs, sentences, words or list items.
- Text Line Tools, Sort, deduplicate, reverse, number, prefix and shuffle lines of text.
- HTML Entity Encoder & Decoder, Escape and unescape HTML entities, including named and numeric references.
- Email & Phone Extractor, Pull email addresses, phone numbers and domains out of any block of text.
SEO Tools & Analyzers
SEO Tools & Analyzers, category overview
- SERP Preview Tool, Pixel-accurate Google desktop and mobile snippet preview.
- Schema Markup Generator, Build valid JSON-LD for eleven schema.org types.
- Meta Tag Generator & Analyzer, Generate a complete head section with Open Graph and Twitter Cards.
- Keyword Density & Readability Analyzer, N-gram density plus Flesch, Gunning Fog and Coleman-Liau scores.
- Robots.txt Generator & Validator, Build robots.txt visually and test whether a URL would be blocked.
- XML Sitemap Generator, Turn a list of URLs into a valid XML sitemap with priorities and lastmod.
- Hreflang Tag Generator, Generate reciprocal hreflang annotations for multilingual sites.
- Redirect Generator (.htaccess & Nginx), Create 301 and 302 redirect rules for Apache, Nginx and Netlify.
Link & URL Tools
Link & URL Tools, category overview
- UTM Builder, Build tagged campaign URLs with presets, bulk mode and CSV export.
- QR Code Generator, Create QR codes for URLs, Wi-Fi and vCards with PNG and SVG download.
- Link Extractor from HTML, Extract every link with anchor text, rel values and internal/external split.
- Open Graph & Social Card Debugger, Inspect Open Graph and Twitter Card tags with platform previews.
- URL Slug Generator, Turn titles into clean, transliterated, SEO-friendly slugs.
- URL Parser & Query String Editor, Break a URL into its components and edit query parameters visually.
Web Development Calculators
Web Development Calculators, category overview
- Color Converter (HEX RGB HSL CMYK), Convert colours, check WCAG contrast and build harmonious palettes.
- CSS Gradient Generator, Linear, radial and conic gradients with unlimited colour stops.
- Regex Tester & Explainer, Live match highlighting, capture groups and plain-English explanations.
- Unix Timestamp Converter, Convert epoch timestamps across time zones and ISO 8601 formats.
- Password Generator & Strength Meter, Cryptographically secure passwords and passphrases with entropy maths.
- UUID Generator, Generate RFC 9562 version 4 and version 7 UUIDs in bulk.
- JWT Decoder, Decode JSON Web Token headers, payloads and expiry times locally.
- CSS Unit Converter, Convert px, rem, em, pt, %, vw and vh against a configurable root size.
- Aspect Ratio Calculator, Solve missing width or height for any aspect ratio, plus common presets.
- IP Subnet Calculator, CIDR maths: network, broadcast, host range, mask and wildcard.
- Cron Expression Generator, Build and read crontab schedules with a plain-English description.
- Random Number Generator, Cryptographically secure random integers, decimals, lists and picks.
- CSS & JS Minifier, Shrink CSS, JavaScript, HTML and JSON with a live saving report.
Guides
- Binary Numbers Explained for Beginners, How base-2 works, why computers use it and how to convert by hand.
- Character Encoding: ASCII, Unicode and UTF-8, A practical history of text encoding and how to avoid mojibake for good.
- Hashing vs Encryption vs Encoding, Three concepts that get confused daily, separated once and for all.
- Password Security and Entropy, What entropy really measures, how cracking works and what NIST recommends.
- The Complete Guide to SEO Meta Tags, Titles, descriptions, canonicals, robots directives and social markup.
- Structured Data and Rich Results, Choosing schema types, writing JSON-LD and validating it properly.
- URL Structure Best Practices for SEO, Slugs, depth, parameters, trailing slashes and international URLs.
- How QR Codes Actually Work, Encoding modes, Reed-Solomon error correction and design constraints.
- Regular Expressions from Zero to Confident, Build regex patterns step by step and avoid catastrophic backtracking.
- Colour and Contrast Accessibility, WCAG contrast ratios, colour blindness and building accessible palettes.
Reference tables
- ASCII Table, The complete ASCII character set with decimal, binary, hex, octal and HTML values.
- Binary Conversion Chart (0-255), Every value from 0 to 255 in binary, decimal, hexadecimal, octal and ASCII.
- HTML Entities Reference, Named and numeric HTML character references with copy-ready code.
- Unicode Blocks Reference, Unicode planes and blocks with code point ranges and UTF-8 byte lengths.
- HTTP Status Codes, Every HTTP response code, what it means and how it affects SEO.
- MIME Types Reference, Common media types mapped to file extensions and typical usage.
- Regex Cheat Sheet, Regular expression syntax, character classes, quantifiers and lookarounds.
- CSS Named Colors, All 148 CSS colour keywords with HEX, RGB and HSL values.