devtoolbox.cc
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.
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