nolo
On-deviceYour files

Developer tools

Developer utilities that are safe for real secrets: everything is computed locally, nothing is logged.

  • ๐Ÿ”’ Nothing uploaded
  • ๐Ÿ“ด Works offline
  • โœ“ Free, no limits, no sign-up
  • ๐Ÿšซ No ads
JSON FormatterFormat, validate and minify JSON with exact error positions. JSON to CSVConvert a JSON array to CSV or TSV, nested objects flattened. CSV to JSONConvert CSV or TSV to a JSON array, numbers kept exact. Base64 Encode/DecodeEncode and decode Base64 text (UTF-8) and files. URL Encode/DecodePercent-encode or decode URLs and query strings. JWT DecoderDecode JWTs, check expiry and verify signatures locally. Hash GeneratorMD5, SHA-1, SHA-256, SHA-384, SHA-512 and HMAC of text. UUID GeneratorGenerate UUID v4 and v7, one or a thousand at a time. Regex TesterTest JavaScript regular expressions with live highlighting. Timestamp ConverterUnix timestamps to dates and back, in any time zone. Color ConverterHEX, RGB, HSL, HWB and OKLCH, plus a WCAG contrast checker. HTML EntitiesEscape and unescape HTML entities like & and <. Number Base ConverterBinary, octal, decimal, hex and base 36, any size. CSS MinifierSafely minify or beautify CSS in your browser.