UUID Generator — This generator produces RFC 4122 version-4 UUIDs using your browser’s cryptographically secure random number generator (crypto.randomUUID). Each value is a 128-bit identifier with 122 random bits, so collisions are practically impossible at any realistic scale.
UUIDs are generated locally with your browser’s crypto API. Nothing is sent anywhere.
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What is uuid generator?
This generator produces RFC 4122 version-4 UUIDs using your browser’s cryptographically secure random number generator (crypto.randomUUID). Each value is a 128-bit identifier with 122 random bits, so collisions are practically impossible at any realistic scale.
Generate a single ID or up to 1,000 at once for seeding databases, fixtures, and test data, and copy them all with one click.
How to use it
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Choose a count
Any number from 1 to 1,000.
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Set the format
Toggle uppercase letters or remove hyphens for compact IDs.
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Generate and copy
Press Generate for a fresh batch; Copy all puts every UUID on your clipboard.
Examples
Standard format
The canonical 8-4-4-4-12 hexadecimal layout.
Result: f47ac10b-58cc-4372-a567-0e02b2c3d479
Compact uppercase
No hyphens, uppercase — common in legacy systems.
Result: F47AC10B58CC4372A5670E02B2C3D479
Frequently asked questions
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Last reviewed: 2026-09-18