Developer Tools
Free online developer tools — format JSON, encode Base64, decode JWTs, generate UUIDs and more, all client-side.
JSON Formatter
Beautify, minify & validate JSON instantly.
Open tool NewBase64 Encode / Decode
Encode & decode Base64 text instantly.
Open tool NewURL Encode / Decode
Percent-encode & decode URLs and query strings.
Open tool NewText Diff Checker
Compare two texts and highlight differences.
Open tool NewUUID Generator
Generate random UUID / GUID v4 in bulk.
Open tool NewSlug Generator
Turn titles into clean, SEO-friendly URL slugs.
Open tool NewJWT Decoder
Decode JWT header & payload instantly.
Open tool NewHTML Encode / Decode
Escape & unescape HTML entities.
Open tool NewNumber Base Converter
Convert binary, octal, decimal & hex instantly.
Open tool NewRandom Number Generator
Generate random numbers in any range.
Open tool NewText to Binary Converter
Convert text to binary code and back.
Open tool NewRegex Tester
Test regex with live match highlighting.
Open tool NewQR Code Generator
Make QR codes for URLs, WiFi, text & more.
Open tool NewCSS Gradient Generator
Build linear & radial CSS gradients visually.
Open tool NewColor Palette Generator
Generate tints, shades & matching color schemes.
Open tool NewCron Expression Parser
Explain cron schedules & preview next runs.
Open tool NewJSON to CSV
Turn JSON arrays into CSV or TSV instantly.
Open tool NewURL Parser
Split a URL into host, path, query & hash.
Open tool NewColor Contrast Checker
Test color contrast against WCAG AA & AAA.
Open tool NewCSS Box Shadow Generator
Design CSS box-shadows with a live preview.
Open tool NewMarkdown to HTML
Convert Markdown to HTML with live preview.
Open tool NewBase64 to Image
Decode Base64 into a viewable image.
Open tool NewXML Formatter
Beautify, minify & validate XML.
Open tool NewYAML to JSON
Convert YAML ↔ JSON with validation.
Open tool NewCSS Minifier
Compress CSS & see bytes saved.
Open tool NewBarcode Generator
Make CODE128, EAN, UPC barcodes — free.
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