What UUID Generator does
UUID Generator uses crypto.randomUUID when available. Its fallback draws 16 cryptographic random bytes, sets the version nibble to 4 and the RFC variant bits, then formats the bytes in the familiar 8-4-4-4-12 hexadecimal layout.
Version 4 UUIDs are probabilistically unique rather than checked against a central registry or your database. Their large random space makes accidental collisions unlikely for ordinary use, but a UUID is still an identifier, not proof of authorization or secrecy.
How to use UUID Generator
- Enter a whole result count from 1 through 1,000.
- Select Generate UUIDs to request fresh browser cryptographic randomness.
- Copy or download the one-UUID-per-line result.
- Apply uniqueness constraints and authorization checks in the destination system rather than trusting format alone.
Important details
Version and variant bits
The fallback explicitly marks UUID version 4 and the standard variant before formatting. These fixed bits identify the layout while the remaining bits come from Web Crypto.
Identifiers are not credentials
A UUID can label records without coordinating a sequence, but possession of one must not grant access by itself. It should not replace a password, token, signature, or database constraint.
Practical uses
- Create identifiers for local fixtures, prototypes, or migration staging.
- Generate client-side correlation IDs for development testing.
- Prepare batches of version 4 UUID values for sample data.
Privacy and limitations
UUID generation happens locally and values are not sent to PagesTools. Once copied into a service, that service's storage and logging rules apply.
The tool provides no deterministic namespace mode, version 1, version 5, version 7, collision registry, database insertion, or access control. Web Crypto support is required, and no batch can exceed 1,000 values.