What is a UUID generator?

It creates UUID v4 identifiers — 128-bit values shown as 8-4-4-4-12 hex characters — for unique database IDs, API keys, and session tokens.

Is UUID the same as GUID?

In practice yes for random v4 values. Microsoft often says GUID; the format matches. Read more in UUID vs GUID.

UUID v4 uses 122 random bits. Collision risk is negligible for normal apps. You would need absurd generation rates for a realistic collision.

Is this cryptographically secure?

Where available the tool uses crypto.randomUUID(). Older browsers may fall back to weaker randomness — use a backend crypto library for security-critical tokens.

Can I generate UUIDs in bulk?

Yes. Set a count (up to 100) and use Copy All to paste the list into code or a spreadsheet.

Developer Tools

Popular

UUID Generator

Create one or many random UUID v4 identifiers in your browser — nothing is uploaded.

How many?

Output

About UUID Generator

Generate RFC 4122 version 4 UUIDs (also called GUIDs) in your browser. Create a single ID or bulk-generate values for database keys, API tests, and distributed systems — nothing is uploaded.

How to Use UUID Generator

Choose how many UUIDs to generate.
Click Generate to create UUID v4 identifiers.
Copy one UUID or use Copy All for bulk seeds and tests.

UUID Generator Formula

A UUID v4 is 122 bits of randomness in the 8-4-4-4-12 hex layout. Position 13 is always 4 (version); position 17 is 8, 9, a, or b (variant). Example format: 550e8400-e29b-41d4-a716-446655440000.

UUID Generator Examples

Single UUID v4

550e8400-e29b-41d4-a716-446655440000

Bulk seed list

Generate 10–100 UUIDs and Copy All into a seed file.

Python / Java style

Same string format as uuid.uuid4() in Python or UUID.randomUUID() in Java.

Common Use Cases

Database primary keys without central ID servers
API and integration test fixtures
Client-side IDs before a record is saved
Correlation IDs in logs and distributed systems

UUID vs GUID

Read the full guide

How to Use UUID Generator: Complete Guide (2026) - 5 min read

Frequently Asked Questions about UUID Generator

What is a UUID generator?: It creates UUID v4 identifiers — 128-bit values shown as 8-4-4-4-12 hex characters — for unique database IDs, API keys, and session tokens.
Is UUID the same as GUID?: In practice yes for random v4 values. Microsoft often says GUID; the format matches. Read more in UUID vs GUID.
Are UUIDs unique?: UUID v4 uses 122 random bits. Collision risk is negligible for normal apps. You would need absurd generation rates for a realistic collision.
Is this cryptographically secure?: Where available the tool uses crypto.randomUUID(). Older browsers may fall back to weaker randomness — use a backend crypto library for security-critical tokens.
Can I generate UUIDs in bulk?: Yes. Set a count (up to 100) and use Copy All to paste the list into code or a spreadsheet.

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