Developer tools
Textarea-first utilities for JSON, YAML, CSV, Base64, hashes, JWTs, regex, diffs and more. Paste, see the result live, copy out.
Files stay on your device. No accounts. Free.
JSON FormatterBeautify or minify JSON live, with clear errors.
JSON to YAML ConverterBoth directions, live, with validation.
CSV to JSON ConverterHeader-row CSV to a JSON array, and back.
Base64 Encode / DecodeText and file modes, both directions.
Hash GeneratorChecksum any text or file instantly.
JWT DecoderInspect tokens locally; expiry made readable.
Timestamp ConverterSeconds, millis, ISO and local, live.
Text DiffSide-by-side inputs, green/red line diff.
Regex TesterLive match highlighting, flags, groups.
Color ConverterPaste any CSS color, get every format.
URL Encode / DecodePercent-encoding, both directions, live.
Markdown PreviewType Markdown, see rendered HTML instantly.
UUID GeneratorCryptographically random v4 UUIDs, one or many.
Password GeneratorLength, character sets, cryptographic randomness.
QR Code GeneratorAny text or URL to a downloadable QR code.
SQL FormatterBeautify SQL live, MySQL and PostgreSQL aware.
XML FormatterBeautify or minify XML, with clear parse errors.
Cron ExplainerPlain English plus the next 5 run times.
More: Image tools · PDF tools · Text tools · Calculators