UUID Generator
Generate cryptographically secure UUID v4 (Universally Unique Identifier) strings in configurable bulk quantities — 1, 5, 10, 50, or 100 at a time — using your browser's native crypto.randomUUID() API for true cryptographic entropy. UUIDs are the industry standard for generating unique database primary keys, distributed system identifiers, session tokens, correlation IDs for log tracing, and idempotency keys for payment processing. Unlike sequential integer IDs, UUID v4 identifiers are statistically guaranteed to be unique without central coordination, making them ideal for microservice architectures, offline-first applications, and merge-safe distributed databases. Each generated UUID follows the canonical 8-4-4-4-12 hexadecimal format with the version 4 indicator. Copy individual UUIDs or the entire batch with a single click — all generation happens locally in your browser with no server dependency.
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How to use UUID Generator
- 1 Select how many UUIDs you need (1, 5, 10, 50, 100).
- 2 Click "Generate UUIDs".
- 3 Copy individual UUIDs, copy all, or download as a text file.
Key Features of UUID Generator
Cryptographically Secure
Generates RFC 4122 compliant version 4 UUIDs using standard window.crypto.
Bulk Generation
Generate up to 100 UUIDs in a single click.
When to Use UUID Generator
Database Primary Keys
Generate UUIDs for use as primary keys in distributed databases where auto-incrementing integers would cause conflicts.
API Idempotency Keys
Create unique request identifiers for API calls to prevent duplicate processing in payment systems and critical operations.
Test Data Generation
Batch generate UUIDs for creating test fixtures, mock data, and seed scripts for development and QA environments.
Frequently Asked Questions
Can two UUIDs collide?
The probability of a duplicate v4 UUID is astronomically low (1 in 2.71 quintillion).
What is the format of a UUID v4?
A UUID v4 follows the pattern xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx where x is a random hexadecimal digit and y is one of 8, 9, a, or b. The "4" indicates version 4 (random).
Where are UUIDs commonly used?
UUIDs are used as database primary keys, session identifiers, API request tracking IDs, distributed system node identifiers, and anywhere a globally unique identifier is needed without a central authority.
How many UUIDs can I generate at once?
You can generate up to 100 UUIDs in a single batch. For larger quantities, run multiple batches or use the copy-all feature.
Are the generated UUIDs truly unique?
Yes. UUID v4 uses cryptographically secure random generation. The collision probability is approximately 1 in 5.3 x 10^36.
Pro Tips & Best Practices
Use v4 for Most Cases
UUID v4 (random) is the most commonly used version with 122 bits of randomness, making collisions virtually impossible.
Batch Generate for Databases
Generate multiple UUIDs at once when preparing seed data, test fixtures, or database migration scripts that require unique identifiers.
Lowercase for Consistency
While UUIDs are case-insensitive per RFC 4122, use lowercase consistently in your applications to avoid comparison issues.