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UUID v4 generator

Generate random UUID v4 identifiers and copy them.

About this tool

Generate random version 4 UUIDs for use as unique identifiers in databases, APIs and files. Each one is produced with your browser's secure randomness.

Why use it

  • Standards-compliant UUIDv4 values, ready to copy.
  • Generate one or many at once.
  • Created locally — no server sees your identifiers.

Common use cases

  • Assign a primary key to a new database record.
  • Create a unique filename or request ID.
  • Seed test data with realistic identifiers.

Tips

  • UUIDv4 collisions are astronomically unlikely, so they are safe as random keys.
  • Store them as a native UUID type when your database supports it.
How to use
  1. Click Generate.
  2. Copy the list.
  3. Generate again for new IDs.
FAQ
What kind of UUIDs are generated?
Random version 4 UUIDs suitable for unique identifiers in apps and databases.
Are the UUIDs generated on a server?
No. They are created locally using your browser cryptographic random source.
Can two UUIDs ever collide?
In practice no; version 4 has so many possible values that duplicates are astronomically unlikely.
Can I generate many at once?
Yes, produce a batch and copy them all for seeding data or test fixtures.
Are they safe to expose publicly?
Yes, a v4 UUID carries no personal or time information, unlike some other versions.
What format are they in?
The standard 8-4-4-4-12 hexadecimal layout with hyphens.

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