TOOL · 09
UUID Generator
Generate version-4 UUIDs in bulk — tweak the format, copy one or all. Powered by your browser's cryptographic RNG.
Input
Output
About UUIDs
A UUID (Universally Unique Identifier) is a 128-bit value used as a practically collision-free key for database rows, file names, session IDs and more. Version 4 UUIDs are random-based: this tool draws 122 bits of entropy from your browser's Web Crypto API, so every value is generated locally and never touches a server.
Features
Version 4
Random-based UUIDs from 122 bits of cryptographic entropy.
Bulk generation
Generate 1 to 100 UUIDs in a single click.
Format options
UPPERCASE or strip hyphens — copy one or copy all.
100% private
Generated by your browser’s crypto RNG, never on a server.
How to use
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1
Choose a count
Pick how many UUIDs you need, from 1 to 100.
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2
Set the format
Optionally enable UPPERCASE or remove hyphens.
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3
Generate & copy
Click Generate, then copy a single UUID or the whole list.
Use cases
Database keys
Practically collision-free primary keys without a central generator.
Session & request IDs
Unique identifiers for tracing requests across services.
File names
Guarantee unique file names for uploads and exports.
Test data
Fill fixtures and mocks with realistic unique values.
Format
550e8400-e29b-41d4-a716-446655440000550e8400e29b41d4a716446655440000A UUID is 128 bits shown as 32 hex digits. The 13th hex digit is the version (4) and the 17th is a variant. 8-4-4-4-12 is the canonical grouping.
FAQ
Can two UUIDs be the same?
In theory yes, in practice no — generating a billion UUIDs a day for a century still makes a collision vanishingly unlikely.
Why version 4?
v4 is fully random and needs no coordination between machines, which makes it the default choice for most applications.
Are these cryptographically random?
Yes — the tool uses crypto.getRandomValues (with a secure fallback), not Math.random, so the output is suitable for identifiers.