UUID generator
Generate random UUID v4 identifiers in bulk, ready to copy.
Generate 1 to 1,000 version-4 UUIDs at once, using the browser’s cryptographic generator. Uppercase and dash-removal options let you paste straight into databases, tests, spreadsheets and seeds. No identifier is generated server-side — there is no record of what you created.
Frequently asked questions
What is a UUID v4?
A randomly generated 128-bit universal identifier in the 8-4-4-4-12 format (e.g. 550e8400-e29b-41d4-a716-446655440000). The "4" marks the version: all bits are random except those flagging version and variant.
Can two UUIDs collide?
In practice, no. There are 122 random bits: generating 1 billion UUIDs per second for 85 years still leaves only a ~50% chance of a single collision. For any real application, treat them as unique.
Can a UUID be used as a password or secret token?
Ours come from crypto.getRandomValues, so they are unpredictable — but the format is predictable and some systems generate non-random UUIDs (v1 uses timestamp and MAC). For secrets, prefer dedicated tokens like those from the password generator.