UUID Generator
Version 4 UUIDs generated in your browser, ready to copy, plus a validator.
- Never leaves your device
- No sign-up
Validate UUID
Quick answer: To generate a UUID, just open the page: a UUID v4 is already there, ready to copy. Choose how many (up to 100), uppercase and hyphens, then click Generate. To check a UUID, paste it into Validate UUID.
How to do it in 3 steps
- 1Choose quantity and format.
- 2Click Generate UUID.
- 3Copy the list.
Why use Pronto Arquivo
Cryptographic
Uses the browser's crypto.randomUUID.
Bulk
Up to 100 UUIDs at a time.
Formats
Lowercase, uppercase, with or without hyphens.
Validator
Tells you whether a UUID is valid and its version.
Guides
UUID vs. GUID
They're the same thing: GUID is the name Microsoft uses.
Frequently asked questions
What is a UUID?
A 128-bit identifier that's practically unique, used as a key in databases and APIs.
What are the odds of a UUID v4 collision?
Negligible: there are 2¹²² possible values.
Is a UUID v4 safe as a token?
It's random, but for session tokens use a dedicated generator with more entropy.
Are the UUIDs saved?
No. They're generated in your browser and never sent anywhere.
