UUID Generator
Generate random version 4 UUIDs in bulk — instantly and privately.
0 UUIDs · version 4
About this tool
A UUID (Universally Unique Identifier), also called a GUID, is a 128-bit value written as 32 hexadecimal digits in the familiar 8-4-4-4-12 pattern, like f47ac10b-58cc-4372-a567-0e02b2c3d479. Version 4 UUIDs are almost entirely random, which makes them practically guaranteed to be unique without any central coordination. Developers reach for them constantly: primary keys, idempotency keys, request and trace IDs, file names, and session tokens.
This generator creates version 4 UUIDs using your browser's built-in cryptographically secure random number generator, so the values are suitable wherever you need unpredictable, collision-resistant identifiers. Choose how many you need — anywhere from one to 100 — and click Generate to produce a fresh batch instantly. Hit Copy to grab the whole list, one UUID per line, ready to paste into code, a seed file, or a spreadsheet.
Because generation happens entirely client-side, no UUID is ever sent to a server, logged, or stored. Every batch is brand new and disappears the moment you leave the page, which makes this a quick, dependable utility for both throwaway test data and real identifiers you are about to commit to a database.
Examples
Input
Count: 1
Output
f47ac10b-58cc-4372-a567-0e02b2c3d479
One random version 4 UUID (each run produces a different value).
Input
Count: 3
Output
9b2e4c1a-7d3f-4a6b-8c5e-1f0d2a3b4c5d 3e7a1b9c-2d4f-4e8a-9b1c-6d5e4f3a2b1c c4d5e6f7-8a9b-4c0d-1e2f-3a4b5c6d7e8f
Three UUIDs, one per line — values are random each time.
Common uses
- Generating a primary key or surrogate ID for a new database row or document
- Creating an idempotency key to safely retry a payment or API request without duplicates
- Producing request, trace, or correlation IDs for logging and distributed tracing
- Seeding test fixtures or mock data with unique identifiers during development
- Naming uploaded files or temporary objects so they never collide in storage
- Issuing opaque session, invite, or reset tokens that are hard to guess
Frequently asked questions
Is this UUID generator free?
Yes. It is completely free with no sign-up, no limits, and no watermarks.
What version of UUID does it generate?
It generates version 4 UUIDs, which are random. Each one is produced by the browser's crypto.randomUUID() and follows the standard 8-4-4-4-12 hexadecimal format.
How many UUIDs can I generate at once?
You can generate anywhere from 1 to 100 UUIDs in a single batch. Enter a number in the field and click Generate.
Are the UUIDs truly random and unique?
They use your browser's cryptographically secure random source. Version 4 UUIDs have so much entropy that collisions are vanishingly unlikely, so they are safe to treat as unique.
Is my data uploaded or stored anywhere?
No. Every UUID is generated locally in your browser and is never sent to a server, logged, or stored.
Embed this tool
Free to use on your own site. It stays fast and private for your visitors.
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