UUID generator
Generate random v4 or time-ordered v7 UUIDs, one or in bulk, with or without hyphens.
Processed on your device: your file never leaves your computer
What UUID generator does
The UUID generator creates unique identifiers following RFC 9562 with your browser's cryptographic random generator. Version 4 is fully random; version 7 starts with the date and time in milliseconds, so the identifiers sort by creation time, which is handy as a primary key in databases. You can generate up to 10,000 at once, in upper case or without hyphens, and download them as text.
Limits
- A job that takes longer than 1 minute is stopped so it doesn't freeze your device.
- Processed in your browser: your files are never uploaded to a server.
Frequently asked questions
Can two UUIDs be the same?
Not in practice: a v4 UUID has 122 random bits, so the chance of a repeat is negligible even after billions of them.
When should I use version 7?
When the identifiers are database keys: since they are ordered by time, indexes fragment less than with v4 UUIDs. Keep in mind that they reveal when they were created.
Are the generated UUIDs stored?
No. They are generated in your browser and never sent to a server.