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UUID Generator
Generate one or multiple RFC 4122 UUIDs instantly – Version 1 (timestamp) or Version 4 (random) – copy individually or download as a list.
✓ Free✓ No signup✓ Privacy first✓ Runs in your browser
Cryptographically secure UUID v4 generation · browser-native crypto · no server
How it works
Convert in three steps
1. Choose your version
Select UUID v1 (timestamp-based) or UUID v4 (randomly generated). V4 is the most commonly used and recommended for most applications.
2. Set the quantity
Enter how many UUIDs to generate - from one to hundreds at once. Each one is unique.
3. Copy or download
Copy individual UUIDs to clipboard, copy all at once, or download the full list as a plain text file.
FAQ
Common questions
A UUID (Universally Unique Identifier) is a 128-bit identifier formatted as a 32-character hex string separated into groups by hyphens – for example: 550e8400-e29b-41d4-a716-446655440000. They are used to uniquely identify records, sessions, database rows, API resources, and anything else that needs a globally unique key without central coordination.
UUID v1 is generated from the current timestamp and the machine MAC address – which means it is time-sortable but reveals when and roughly where it was generated. UUID v4 is generated from random numbers – no timing or hardware information is embedded. V4 is preferred for most use cases because it is unpredictable and does not leak system information.
In practice, yes. The probability of generating two identical UUID v4 values is astronomically small. For any real-world application generating even millions of UUIDs, a collision is effectively impossible. They are safe to use as unique identifiers without a centralized sequence or uniqueness check.
Yes, and it is a common pattern – especially in distributed systems where multiple services need to generate IDs without coordinating. The tradeoff is that UUIDs are larger than integer IDs and non-sequential UUID v4 values can cause index fragmentation in some databases. UUID v1 or ULID are better choices when time-ordering matters for performance.
Keep going
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Convert timestamps used in UUID v1 generation.
JWT Decoder
Inspect JWTs that use UUIDs as subject or jti claims.
About the UUID Generator
UUIDs are one of the most widely used identifier formats in software – every major database, API framework, and cloud service supports them. Generating them for testing, seeding databases, creating dummy data, or verifying format expectations is a constant developer task. This generator produces RFC 4122-compliant v1 and v4 UUIDs directly in your browser – no server call required, no API key, no rate limit. Generate one for a quick paste into a query, or produce hundreds at once for a test data seed file.
Benefits
- RFC 4122-compliant UUID v1 and v4 generation - correct format guaranteed.
- Bulk generation - produce up to hundreds of unique IDs in a single click.
- Copy all or individually - flexible output for different workflow needs.
- Entirely client-side - no server involved, no IDs logged anywhere.
Privacy
UUID generation runs entirely in your browser. No generated values are transmitted to or stored on any server.