Developer utilities

Validate, format, minify, sort keys, query with JSONPath and convert to or from YAML, TOML and CSV.

UTF-8 Base64 and hex, URL components and parsing, HTML entities, IDN-to-ASCII and quoted-printable byte escapes.

WebCrypto SHA-1 and SHA-2 digests over text or local files, plus HMAC with a text key.

Decode header and payload locally, explain time claims and clearly mark the signature as unverified.

Unix seconds and milliseconds, timezone-qualified ISO 8601 and RFC 2822, UTC forms and relative time.

Generate UUID v1, v4, v5 and v7, ULID and Nano IDs; inspect UUID versions and embedded timestamps.

Passwords and diceware passphrases from WebCrypto, with random selection estimates and WPA PSK derivation.

Match highlighting, groups, replace and flags, run in a worker with a timeout.

Parse a cron expression to English, list the next runs in a chosen timezone, or build one.

Text and JSON diff, side by side or unified, with whitespace ignored on request.

Generate QR codes for text, Wi-Fi and vCards, and scan one from your camera or an image.

Exact binary, octal, decimal and hex conversion, IP address to integer and back, and dotted IPv4 masks.

File permission calculator, symbolic and octal.

Format, validate and convert YAML.

Format, validate and convert XML.

Format, validate and convert CSV.

Preview Markdown and export the HTML.

HEX, RGB, HSL and OKLCH conversion with a contrast checker.

DNS record types, HTTP status codes, common ports, MIME types, ASCII, subnet cheat sheet and special-use ranges.