Local-first devtools
Developer Toolbox
9 browser-only tools. Your data never leaves the tab.
JWT Toolkit
Crypto & SecurityDecode a JWT, verify its signature and claims, or sign a new one with your own key.
Hash Calculator
Crypto & SecurityCompute MD5 / SHA-1 / SHA-256 / SHA-384 / SHA-512 digests of text or files.
JSON Formatter
FormattingFormat, minify and validate JSON, with a tree view and path extraction.
Base64 EncoderConvert text, images and binary data to and from Base64 / Base64URL.EncodingURL EncoderConvert percent-encoding both ways, and break a URL into its parts and query parameters.EncodingColor ConverterConvert between HEX / RGB / HSL / OKLCH, with a contrast checker.FormattingRandom GeneratorGenerate UUID v4 / v7 and NanoID in bulk, plus strong passwords with a custom character set.GeneratorsQR Code GeneratorTurn text, links or Wi-Fi credentials into a downloadable QR code.GeneratorsTimestamp ConverterConvert Unix timestamps and dates both ways, with a time zone comparison.Date & Time