Convert between JSON, YAML, CSV and XML
Paste anything on the left, pick what you want out. Detection is automatic.
JWT decoder
Decodes header and payload and checks expiry. Signature verification needs the secret, which stays on your server — this never asks for it.
Hash generator
SHA-1, SHA-256, SHA-384 and SHA-512 via the browser's own WebCrypto. MD5 is deliberately absent — browsers don't implement it, and it hasn't been safe to trust for years.
UUID generator
RFC 4122 version 4, from crypto.randomUUID.
Regex tester
Live matching with highlights and capture groups.
URL encode & decode
Component-level encoding (encodeURIComponent) — the one you want for query-string values.
Timestamp converter
Unix seconds or milliseconds ⇄ human dates, in UTC and your local zone.
Text diff
Line-by-line comparison — added lines in green, removed in red.
Cron expression explainer
Standard five-field cron: minute, hour, day-of-month, month, day-of-week.
Colour converter
HEX ⇄ RGB ⇄ HSL, with a live swatch.
Case converter & slugify
Every casing you need for variables, files and URLs.