Developer & Web Tools
Developer & Web Tools tools
22 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.QR Code GeneratorCreate QR codes for URLs, text, WiFi, contact details and more. Download as SVG or PNG.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.