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UUID Generator

Generate globally unique IDs for DB keys, trace IDs, and temp filenames. Uppercase, URN, compact formats supported.

Privacy: processed locally, never uploaded.

↓ Paste in the input area below to see results instantly

Count
Format

Output

UUID list

5a624429-76e1-4824-a614-822a00d48440
4ab3a53f-d7e8-415d-8327-61cb06d70afe
971051db-01fe-46bf-a85a-ed4a993313b5
e955b6f6-050e-4a35-a4cb-df70277e4dfd
56c77993-253d-4187-b348-cf4052eebdab

Notes

About UUID v4

Cryptographically random identifiers，ideal for database keys, request IDs, and unique filenames. Generated 5 ID(s).

Generate globally unique IDs for DB keys, trace IDs, and temp filenames. Uppercase, URN, compact formats supported.

Quick start

  1. Set count

    Up to 100 per batch.

  2. Pick format

    Default hyphenated; switch case or URN per team convention.

  3. Generate and copy

    Click generate, then copy the batch.

What is UUID v4

Version 4 uses random bits; collision risk is negligible without a central coordinator.

Common use cases

DB primary keys, distributed log requestId, frontend temp keys.

Typical Workflow

When developing API services, we often need unique identifiers for each request. Open the UUID generator, select the no-hyphen format, and batch generate 20 IDs. Preload these into a Redis queue, then pop them when new requests arrive - more efficient than real-time generation.

For user-uploaded files, using UUIDs instead of original filenames is safer. Generate IDs in URN format like 'urn:uuid:xxx' as S3 storage paths. This structured naming avoids conflicts while enabling easy file location via Uniform Resource Identifier.

Examples

Standard

Input

  
Output
 
550e8400-e29b-41d4-a716-446655440000
   
 
 
 
 
FAQ
 
 
 Can duplicates occur? 
Theoretically yes, but the v4 space is so large duplicates are practically impossible.
 
 UUID v1 support? 
Only v4 random UUIDs for now; the best general-purpose choice.
 
 Can generated UUIDs collide? Does it require internet? 
v4 UUIDs use strong randomness with negligible collision probability (theoretically needing ~2^64 IDs for potential conflict). All computations happen locally in your browser without internet, and no IDs are uploaded to servers.