UUID Generator
Last updated: March 30, 2026Generate random UUID v4 identifiers.
This UUID generator creates cryptographically random version 4 (v4) UUIDs instantly in your browser. Generate one or a batch of up to 100 at once, and copy a single value or the whole list with a click — ready for database keys, API keys, session IDs and test data. The Web Crypto API produces them locally, so nothing is sent to a server.
How to use UUID Generator
This free UUID generator creates cryptographically random version 4 (v4) identifiers instantly in your browser. Generate a single UUID or a large batch at once, ready to copy for database primary keys, API keys, session IDs and test data. The values are produced locally with the Web Crypto API and never sent anywhere.
Read the full guide: UUID Generator Guide: Create Unique v4 IDs Instantly
- 1Choose how many UUIDs you want to generate, from one to a full batch.
- 2Click Generate to produce random version 4 UUIDs instantly.
- 3Copy a single value or the whole list and paste it into your code, database or test fixtures.
Cryptographically random
Values come from the Web Crypto API, giving high-quality randomness suitable for unique keys.
Bulk generation
Create many UUIDs in one click instead of generating them one at a time.
Private by design
Every identifier is generated on your device, so nothing is logged or transmitted to a server.
Generate a UUID v4
Get a single random version-4 UUID — a 128-bit identifier that needs no central registry to stay unique — and copy it in one click for a quick primary key, request ID or unique token.
Bulk-generate UUIDs
Set a count of up to 100 and generate the whole list at once, then copy them together. Useful for seeding a database table, building a set of test fixtures, or pre-allocating IDs without scripting a loop.
Create a GUID
GUID is Microsoft's name for the same 128-bit value. The v4 UUIDs generated here are valid GUIDs and work anywhere a GUID is expected — .NET, SQL Server, the Windows registry and more.
Make IDs for test data and mocks
Generate throwaway unique identifiers for unit tests, mock API responses and sample records. Because everything runs offline in your browser, you can do it with no network and nothing logged.
UUID Generator — frequently asked questions
What is a version 4 UUID?
A v4 UUID is a 128-bit identifier whose digits are almost entirely random. It is the most common UUID type because it needs no central authority to stay unique.
Are these UUIDs guaranteed to be unique?
Uniqueness is practically guaranteed, not mathematically absolute. The number of possible v4 UUIDs is so vast that the chance of a collision is negligible for any realistic use.
Can I trust these for production keys?
Yes. Because they use the browser's cryptographic random source, they are suitable for database keys, tokens and other identifiers in production systems.
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