UUID / ULID / NanoID Studio
Generate UUID v4, ULIDs and NanoIDs in bulk — copy or download.
Alphabet needs at least 2 unique characters.
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⏱ Timestamp encoded in the first ULID
UUID v4 is a 128-bit identifier with 122 random bits — generated here via your browser's cryptographically secure crypto.randomUUID(). The collision odds are astronomically low.
Format: xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx — the 4 marks the version, and y is one of 8/9/a/b. Great for database keys, request IDs and de-duplication.
ULID (Universally Unique Lexicographically Sortable ID) packs a 48-bit millisecond timestamp + 80 random bits into a 26-char Crockford base-32 string.
Because the time comes first, ULIDs sort chronologically as plain text — perfect for time-ordered records, URLs and log lines. Enable Monotonic to keep order even within the same millisecond.
NanoID is a tiny, URL-friendly unique-ID generator. It uses a secure random source and a customizable alphabet & length, so you can trade size for collision resistance.
The default 21-char alphanumeric ID has a similar collision profile to UUID v4 but is shorter and URL-safe. Shorten the length for human-friendly codes, but watch the collision odds below.
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100% offline — IDs are generated with your browser's secure random source (crypto.getRandomValues) and never leave your device.
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