What it does
Generate one or up to 1,000 identifiers at once and paste them straight into code:
- UUID v4: 122 random bits, the classic GUID.
- UUID v7 (RFC 9562): a 48-bit Unix millisecond timestamp followed by random bits. v7 values sort by creation time, which keeps database indexes compact.
- ULID: 26-character Crockford Base32, also time-sortable and URL-safe.
- Nil and Max special values.
Within a batch, v7 and ULID values are strictly increasing even when many are created in the same millisecond (the timestamp is kept and the random part is incremented, as RFC 9562 describes for monotonic generation).
Formatting options cover lowercase or UPPERCASE, with or without hyphens, {braces} like .NET Guid.ToString("B"), double or single quotes, and comma separators for arrays and SQL IN (...) lists.
Inspector
Paste any UUID, GUID or ULID to see its version, variant and validity. For v1, v6, v7 and ULID the embedded timestamp is decoded to UTC and local time. You also get the canonical form, the byte order used by .NET Guid.ToByteArray(), Base64, and the same 128-bit value expressed as a ULID (or as a UUID for a ULID).
How to use
Pick a type, set how many you need and press Generate (or Ctrl+Enter). Copy or download the list. Click any generated line to inspect it.
Privacy
Identifiers are generated in your browser with crypto.getRandomValues. Nothing is sent to a server. Your format settings are remembered locally.