Can two UUIDs ever be the same?

In theory, but the odds are so tiny that it isn't a practical concern.

What's the difference between UUID and GUID?

They are the same thing; GUID is Microsoft's name for it.

Is the randomness secure?

Yes — it uses the browser's crypto API.

Are they in uppercase?

Lowercase, which is the common standard; both forms are valid.

Does it support UUID v7?

No, this tool creates version 4 only.

UUID Generator

Generate cryptographically random UUID v4 identifiers.

Reading time:: 2 min
Last updated:: 5 August 2026
Price:: Free, no signup

Your text

Results (live)

Type or paste text to see the result.

What the UUID Generator does

Create version 4 UUIDs like '3f6c2a1e-8b4d-4e7a-9c21-5d0f8a7b6e43' — 128-bit identifiers that are, for practical purposes, guaranteed never to repeat. Type a number to get that many at once, up to 1,000.

They're created with your browser's cryptographic random generator, the same source used for secure keys.

Why the UUID Generator is useful

Databases, APIs and apps need IDs that can be made on any machine without checking a central counter. UUIDs solve that, which is why they appear in almost every modern system.

Generating a batch here is handy for seeding test data or filling a spreadsheet of records.

Also known as: uuid generator, guid generator, uuid v4, free uuid generator, online uuid generator, uuid generator online free, uuid generator tool.

How to use the UUID Generator

1
Enter how many
Leave blank for one, or type e.g. 20.
2
Copy the list
One UUID per line.
3
Paste into your project
Database seeds, fixtures or config files.

Key features

RFC 4122 version 4 format
Cryptographically secure randomness
Bulk generation up to 1,000
One per line for easy pasting

Benefits

Unique IDs without a central server
Fast test data creation
Secure randomness without installing anything

Real-life use cases

Seeding a database

A developer generates 50 UUIDs to give each sample customer record a realistic primary key.

Tracking event IDs

A product manager adds a fresh UUID to each row of an event planning sheet so items can be referenced unambiguously.

Tips for the best results

The '4' at the start of the third group marks it as a version 4 UUID.
UUIDs aren't secret — don't use them as passwords.
Store them in a native UUID column where your database supports it; it uses less space than text.

Conclusion

Generate one UUID or a thousand, securely and instantly, ready to drop into your code or data.

Frequently asked questions

Can two UUIDs ever be the same?: In theory, but the odds are so tiny that it isn't a practical concern.
What's the difference between UUID and GUID?: They are the same thing; GUID is Microsoft's name for it.
How many can I generate?: Up to 1,000 per run.
Is the randomness secure?: Yes — it uses the browser's crypto API.
Are they in uppercase?: Lowercase, which is the common standard; both forms are valid.
Does it support UUID v7?: No, this tool creates version 4 only.

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Keep exploring

Browse the full tools directory, filter by category, or read guides on the Text Tools Hub blog.