Format, encode, decode, hash and inspect data formats.
Format, validate and minify JSON with precise, human-readable error messages.
Convert JSON arrays to CSV and back, with proper quoting and nested-field flattening.
Encode and decode Base64 text — Unicode-safe — plus file to Base64 and back.
Percent-encode text for URLs, or decode an encoded URL back to plain text.
Decode a JSON Web Token’s header and payload, with expiry shown in plain English.
Generate one or hundreds of random v4 UUIDs, ready to copy.
SHA-1, SHA-256, SHA-384 and SHA-512 hashes of any text or file.
Test regular expressions live, with highlighted matches and capture groups.
Convert Unix timestamps to human dates and back — seconds or milliseconds, local and UTC.
Escape text for safe HTML, or decode entities back to readable characters.
Write Markdown with a live rendered preview, and export clean HTML.