Developer tools
Format, validate, encode and generate: JSON, Base64, URL encoding, UUIDs, hashes, regex testing and more, all client-side.
10 tools
Base64 Encode/DecodeConvert text and files to Base64 and back — URL-safe, offline-capable, nothing leaves your browser.Color ConverterConvert an opaque sRGB color as you type, copy modern CSS values, and see its WCAG contrast against white and black.CSV ↔ JSONConvert in either direction live, then inspect the converted rows in a table before you copy or download.Hash GeneratorCreate and compare text or file checksums locally, without uploading them.JSON FormatterPretty-print, minify and explore JSON in a tree view — with the exact line and column of any syntax error.JWT DecoderPaste a JWT or Bearer token to read its claims and live expiry timing without sending or saving the token.Regex TesterTest a JavaScript regex as you type, inspect every match and capture, then return to the same local working state later.Screen Resolution CheckerSee the browser’s screen, viewport, DPR, and zoom readings side by side—without confusing CSS pixels with a panel’s native resolution.URL EncoderPercent-encode a value or full link, then inspect and edit its query parameters without sending the URL anywhere.UUID GeneratorGenerate secure UUID v4 or sortable v7 IDs in batches, then copy them in the format your code expects.