UUID v4 Generator
Generate cryptographically random RFC 4122 Version 4 UUIDs individually or in bulk.
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Output & Format Settings
Generated UUIDs (0)
RFC 4122 Version 4 StandardAbout UUID v4 Generator
Fast, developer-friendly UUID v4 generator. Generate single or bulk unique identifiers with customizable uppercase, hyphenation, braces, and export formats (JSON, SQL IN, CSV).
Accepted Input:Batch size from 1 to 1,000 UUIDs and formatting rules
Output Result:Valid RFC 4122 UUID v4 strings in list, JSON, SQL, or CSV
Processing model:UUIDs are generated using your browser's native crypto.randomUUID engine with zero tracking.
How It Works
1Step 1
Choose how many UUIDs you want to generate (from 1 to 100).
2Step 2
Toggle formatting options: uppercase/lowercase, hyphens, braces, or quotes.
3Step 3
Select your export structure (Plain List, JSON Array, SQL IN clause, or CSV) and copy or download.
Common Use Cases
Generating primary keys for relational databases (PostgreSQL, MySQL, SQLite).
Creating unique correlation IDs, transaction IDs, and idempotency keys for distributed APIs.
Mocking test fixtures, synthetic database seeds, and test datasets.
Frequently Asked Questions
Quick answers to common questions for users and search assistants
What is a UUID version 4?
A Version 4 UUID is a 128-bit identifier generated using cryptographically strong pseudo-random numbers. The odds of a collision among billions of IDs are mathematically negligible.
Is there any risk of duplicate UUIDs?
Generating 1 billion UUIDs per second for 85 years yields less than a 50% chance of a single duplicate.