UUID Generator
Generate cryptographically random UUID v4 identifiers, one or in bulk, with uppercase, no-hyphen, and quoted formats.
Processed locally in your browser — nothing is uploaded.
UUID Generator
Bulk generate
UUIDs
Output appears here…About UUID Generator
Generate version 4 UUIDs using your browser's cryptographically secure random number generator. Generate one or hundreds at once, and format them as lowercase, uppercase, without hyphens, or quoted for direct pasting into code or SQL.
Common uses
- Get an ID for a test fixture, database row, or API key name
- Bulk-generate identifiers for seed data
Example
Input
Generate →
Output
8f14e45f-ceea-4a67-8c3d-1b2a9d3f5e7c
Limitations
- UUIDs are generated locally and never stored — refresh and they're gone
Frequently asked questions
Are the UUIDs I generate stored or logged anywhere?
No. They are produced in your browser by the platform's cryptographically secure random number generator and exist only on the page — refresh and they are gone, and no server ever sees them.
Can two randomly generated UUIDs collide?
In theory yes, in practice no. A version 4 UUID contains 122 random bits, so you would need to generate around 2^61 UUIDs — over two quintillion — before the odds of a single collision reach 50%.
What does the 4 in UUID v4 mean?
It is the version number, stored as the first character of the third group (xxxxxxxx-xxxx-4xxx-…). Version 4 means the UUID is generated from random data, unlike v1 (timestamp plus MAC address) or v5 (name-based hash).
Is a UUID v4 safe to use as a secret token?
It is unpredictable — this tool draws it from a CSPRNG, giving 122 bits of randomness — but UUIDs are designed as identifiers, not credentials, and routinely end up in logs and URLs. For session tokens or API keys, prefer a value generated and handled as a secret.
How many UUIDs can I generate at once?
Up to 1,000 per click in bulk mode. The list appears one per line in your chosen format and can be copied or downloaded as a text file.