WebDevTools

Fast, private developer tools that run in your browser. No sign-up, no uploads — everything runs on your device.

JSON EditorDataFormat, validate, minify and explore JSON online. Text and tree views, key sorting and search. Runs locally in your browser.
Base64EncodingEncode and decode Base64 with full UTF-8 support, URL-safe variant, and file to Base64 / data URI conversion. Nothing leaves your browser.
JWT DebuggerSecurityDecode JSON Web Tokens, check expiry, verify HS/RS/ES/PS signatures and sign new tokens. Keys and tokens never leave your browser.
Number BaseConversionConvert numbers between binary, octal, decimal, hexadecimal and any base 2–36. Arbitrary precision and two's complement view.
URL EncodeEncodingPercent-encode and decode URLs and query strings, and break a URL into its parts with an editable query parameter table.
HashSecurityGenerate MD5, SHA-1, SHA-256, SHA-384 and SHA-512 hashes and HMACs for text or files, in hex or Base64. Computed locally.
UUIDGeneratorsGenerate random v4 and time-ordered v7 UUIDs in bulk, and inspect any UUID for its version, variant and embedded timestamp.
TimestampConversionConvert Unix timestamps (seconds, ms, µs, ns) to human dates in any time zone and back. ISO 8601, RFC 2822 and relative time.
Linux CheatsheetReferenceSearchable Linux command cheatsheet: files, permissions, processes, networking, grep/sed/awk, archives, systemd and SSH.
SQL CheatsheetReferenceSearchable SQL cheatsheet: queries, joins with diagrams, aggregation, window functions, CTEs, DDL and indexes. PostgreSQL, MySQL, SQLite.