UUID Generator
Generate v4 UUIDs / GUIDs in bulk · free, no signup
Free UUID / GUID Generator
A UUID (universally unique identifier), also called a GUID, is a 128-bit value used to label records, files, sessions and devices without a central authority. Version 4 UUIDs are random, which makes collisions astronomically unlikely.
Generate a single UUID or a whole list, then copy or download it. Options let you use uppercase letters or remove the hyphens to match the format your database or API expects.
Key features
Bulk generation
Create up to 1,000 UUIDs at once.
Format options
Uppercase, no hyphens and braces.
Secure randomness
Built on the browser's crypto random generator.
Copy or download
Copy the list or save it as a text file.
How to use it
- Choose how many UUIDs you need.
- Pick the format options.
- Click Generate.
- Copy or download the results.
Worked example
Example
f47ac10b-58cc-4372-a567-0e02b2c3d479 9b2f4c1e-7a3d-4e6b-8f21-5d9c0a4b7e13 (version 4: the 13th character is always 4 and the 17th is 8, 9, a or b)
Who uses this tool
Software developers
Create unique IDs for records, sessions and files.
QA and test engineers
Generate large batches of test data.
Database designers
Choose collision-safe identifiers.
Tips for the best results
- Use lowercase, hyphenated UUIDs unless your system needs another format.
- Generate in bulk for seed data, then download the list.
- Store UUIDs in a native UUID column type where available.
- Do not use UUIDs as secrets — they are identifiers, not passwords.
Common mistakes to avoid
- Treating a UUID as a security token.
- Removing hyphens in one place but not another.
- Assuming UUIDs sort by creation time (v4 does not).
Why use AZRS QuickFix?
It is 100% free, needs no signup and has no watermark or usage limits. The tool runs in your browser, so what you type stays on your device, and it works on phones, tablets and desktops. New tools are added every week — bookmark this page or browse the full QuickFix toolbox.
Frequently asked questions
What is a UUID v4?
A UUID made from random numbers, formatted as 8-4-4-4-12 hexadecimal characters.
Can two UUIDs be the same?
Theoretically yes, practically no. The chance of a collision is vanishingly small.
Is a GUID different from a UUID?
No. GUID is Microsoft's name for the same identifier standard.
Are UUIDs safe to use as database keys?
Yes, though they are larger and less sortable than integer IDs.
Are UUIDs really unique?
In practice yes — the chance of two random v4 UUIDs colliding is astronomically small.
What is the difference between UUID versions?
v1 uses time and hardware, v4 is random, v5 is name-based, and v7 is time-ordered.