Small jobs slow developers down: tidying an API response, decoding a token, checking a file checksum or turning a timestamp into a readable date. These free developer tools handle those tasks in seconds. Everything runs locally in your browser, so the JSON, tokens, keys and files you paste are never sent to a server. Choose a tool below to get started.
JSON Formatter
Beautify, minify and validate JSON with exact error locations.
Open toolBase64 Encoder / Decoder
Encode or decode Base64 text and files, with URL-safe output.
Open toolURL Encoder / Decoder
Percent-encode or decode URLs and inspect every query parameter.
Open toolHash Generator
Create MD5, SHA-1, SHA-256, SHA-512 and HMAC hashes of text or files.
Open toolUUID Generator
Generate random v4 or time-ordered v7 UUIDs, up to 500 at once.
Open toolRegex Tester
Test regular expressions with live highlights, groups and replace.
Open toolJWT Decoder
Decode JWT header and payload and check expiry times instantly.
Open toolUnix Timestamp Converter
Convert Unix timestamps to dates and dates back to timestamps.
Open tool