Developer & Web Tools
Developer & Web Tools tools
21 free tools. No sign-up, no server, works offline.
JSON Formatter & ValidatorFormat, validate and minify JSON. Pinpoints the exact line and column of any syntax error.XML Formatter & ValidatorIndent, tidy and check XML. Also minifies for production and reports tag structure.CSV to JSON ConverterConvert CSV or TSV into JSON, and back again. Handles quoted fields and embedded commas.Base64 Encoder & DecoderEncode text to Base64 or decode it back. Full Unicode support, plus URL-safe output.URL Encoder & DecoderPercent-encode text for URLs and query strings, or decode it back to readable form.HTML Entity Encoder & DecoderEscape text for safe display in HTML, or convert entities back to characters.JWT DecoderDecode a JSON Web Token to inspect its header, payload and expiry. Runs entirely in your browser.Meta Tag & Open Graph GeneratorGenerate SEO meta tags, Open Graph and Twitter Card markup, with live length warnings.robots.txt GeneratorBuild a valid robots.txt with crawl rules, sitemap references and common bot presets..htaccess Snippet GeneratorGenerate Apache rules for HTTPS redirects, www handling, caching, compression and security headers.UUID GeneratorGenerate cryptographically random version 4 UUIDs, singly or in bulk.Lorem Ipsum GeneratorGenerate placeholder text by paragraphs, sentences or words — classical Latin or plain English.URL Slug GeneratorTurn titles into clean, SEO-friendly URL slugs. Handles accents and multiple lines at once.Text Case ConverterConvert between camelCase, snake_case, kebab-case, PascalCase, CONSTANT_CASE, Title Case and more.Colour Converter & Contrast CheckerConvert between HEX, RGB, HSL and HSB, and check WCAG contrast against a background.CSS Gradient GeneratorBuild linear and radial CSS gradients with a live preview and copy-ready code.Favicon GeneratorGenerate every favicon and app icon size from one image, with the HTML to install them.Hash Generator (SHA-256, SHA-1, MD5, CRC32)Generate cryptographic and checksum hashes from text, entirely in your browser.Regex TesterTest regular expressions against sample text with live match highlighting and capture groups.Cron Expression ParserTranslate a cron expression into plain English and see exactly when it will next run.Markdown to HTML ConverterConvert Markdown to clean HTML, with support for headings, lists, code blocks, links and tables.