UUID Generator – Generate v1, v4, v5 UUIDs & GUIDs Online
Generate UUIDs in v1, v4, or v5 format — cryptographically secure, bulk generation up to 1000
ℹ️ UUID Information
- Version 1: Time-based, includes MAC address and timestamp
- Version 4: Random, most commonly used
- Version 5: Name-based using SHA-1, deterministic
🔧 Common Use Cases
- Database primary keys
- Session identifiers
- File/object names
- API request IDs
- Distributed system identifiers
Generated UUIDs (5)
a916d516-e04c-4bf7-a73f-37de22d533128c2254c5-af57-4450-a041-d5245e739d825b56aeb3-cadb-4706-9a02-9ccb6f3ee995fd53be61-209a-40a0-b847-65a5c52bb5c7f5d8115c-90b3-4b8c-a3db-288a645af988📊 Statistics
With 5 UUID v4 generated, the probability of any collision is approximately: negligible
This is astronomically low. You would need to generate trillions of UUIDs before having even a 50% chance of collision.
Frequently Asked Questions
What is a UUID?
A UUID (Universally Unique Identifier) is a 128-bit value written as 32 hexadecimal digits in a 8-4-4-4-12 pattern. It's designed to be globally unique without requiring a central authority.
What is the difference between UUID v1 and v4?
UUID v1 uses your machine's MAC address and a timestamp — it's unique but reveals when and where it was created. UUID v4 is completely random, making it the most popular choice for most applications.
Can two UUIDs ever be the same?
Theoretically yes, but practically no. A UUID v4 has 122 random bits, giving approximately 5.3 x 10^36 possible values. You'd need to generate 2.71 quintillion UUIDs to have a 50% chance of a single collision.
Are the UUIDs cryptographically secure?
Yes. This generator uses the Web Crypto API (crypto.getRandomValues), which provides cryptographically secure randomness — not Math.random().
When should I use UUID v5?
Use v5 when you need deterministic IDs — the same namespace + name always produces the same UUID. Useful for generating consistent IDs from URLs, DNS names, or other identifiers.
Can I generate UUIDs in bulk?
Yes. Set the count (up to 1000) and generate them all at once. Copy all or download as a text file for batch operations.
UUID Generator: Generate v1, v4, v5, v7 UUIDs & GUIDs Online
Universally Unique Identifiers — 128-bit values practically guaranteed to be unique across all space and time — are created by this UUID generator. Random UUIDs (v4), time-based (v1), or deterministic (v5) with a namespace can be generated. Bulk generation of up to 1000 at once is supported. Each UUID is cryptographically random and ready to use as database primary keys, API request IDs, or session tokens. Also known as "uuid v4 generator", "guid generator", and "uuidv4".
UUID versions explained
Version 1 uses your MAC address and timestamp — unique but reveals when and where it was created. Version 4 is completely random — the most popular choice for most applications. Version 5 is deterministic — the same input always produces the same UUID, useful for generating stable IDs from known values.
Bulk generation
100 UUIDs for test data or database seeding can be generated in bulk with one click. Each one is cryptographically random (v4) using the Web Crypto API, not Math.random(). All can be copied at once or downloaded as a text file.