UUID Generator
Developer ToolsGenerate cryptographically random UUID v4 identifiers in bulk.
Runs entirely in your browser — nothing is uploaded
Features
- Generates up to 500 identifiers at once.
- Uses the Web Crypto RNG, not Math.random.
- Uppercase, hyphen-free and braced output variants.
- Copy the whole list or download it as plain text.
How to use the UUID Generator
- 1Choose how many UUIDs you need.
- 2Toggle formatting options such as uppercase or no hyphens.
- 3Click Generate, then copy the list.
Frequently asked questions
Are these safe to use as database keys?
Yes. Version 4 UUIDs carry 122 random bits, so collisions are not a practical concern.
Which UUID version is produced?
Version 4 (random), generated with crypto.getRandomValues and the correct version and variant bits set.
Where does the randomness come from?
The browser's crypto.getRandomValues, a cryptographically secure source seeded by the operating system. It is not Math.random, and the difference matters: Math.random is predictable enough that identifiers built on it can be guessed, which has been the root of real vulnerabilities.
How likely is a collision?
Negligible at any realistic volume. A v4 UUID carries 122 random bits, so you would need to generate billions per second for decades before a duplicate became likely. The practical risks with UUIDs are all elsewhere: truncating them, storing them as text when your database has a native type, or using them where a sequential key would index far better.