UUID Generator: Create v4, v1, and v5 UUIDs in Your Browser
Generate UUID v4 (random), v1 (timestamp), and v5 (namespace) identifiers in single or bulk mode. Format output with uppercase, braces, or hyphen-free styles for databases, APIs, and test fixtures.
Key Features
- UUID v4, v1, and v5 generation
- Bulk generate up to 1,000 UUIDs at once
- Uppercase, {braces}, and hyphen-free formatting
- Session history of recently generated IDs
- One-click copy for single or bulk output
Common Use Cases
- Create primary keys for database seed scripts
- Generate correlation IDs for distributed tracing
- Produce test fixtures for unit and integration tests
- Assign unique identifiers in API mock servers
- Generate deterministic v5 IDs from namespace + name
Benefits
- Cryptographically random v4 via crypto.randomUUID when available
- No server dependency — works offline
- Bulk copy saves time in QA and development
- Free with no generation limits beyond bulk cap
What is a UUID?
A UUID (Universally Unique Identifier) is a 128-bit value formatted as 36 characters with hyphens. UUIDs are used for database keys, API identifiers, session tokens, and anywhere you need a unique ID without a central allocator.
This tool generates UUIDs entirely in your browser using crypto.randomUUID() and the Web Crypto API — nothing is sent to a server.
Which version should I use?
UUID v4 is random and the best default for most applications. UUID v1 embeds a timestamp and is useful when time-ordering matters. UUID v5 is deterministic — the same namespace and name always produce the same UUID, ideal for stable IDs derived from URLs or domain names.
Use bulk mode to generate up to 1,000 UUIDs at once for test data or batch imports.
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