UUID Generator
Professional UUID generation, validation, and analysis with support for all UUID versions.
Generator Settings
Timestamp-based with MAC address
Name-based using MD5 hash
Random or pseudo-random
Name-based using SHA-1 hash
UUID Tools0 generated
No UUIDs generated yet
Click 'Generate UUID' to start
Generator Statistics & Analysis
About this tool
A UUID (Universally Unique Identifier, also called a GUID) is a 128-bit value designed to be unique across space and time without any central coordination. That property makes UUIDs ideal as database primary keys, session and request identifiers, file names, and API resource IDs — especially in distributed systems where two nodes must generate non-colliding IDs independently. The most common variant, version 4, is almost entirely random, which is why collisions are, for practical purposes, impossible.
This generator produces RFC 9562-compliant UUIDs using the browser's cryptographically strong Web Crypto random number generator. Create one identifier on demand or bulk-generate hundreds for seeding test data, and copy them in the exact casing and formatting your codebase expects. All generation is local — no identifier is ever sent to a server.
How to use
Generate a UUID
Click generate to produce a fresh, random version-4 UUID.
Bulk generate
Set a count to create many UUIDs at once for seeding databases or test fixtures.
Adjust the format
Toggle options like uppercase or hyphenation to match your storage or code conventions.
Copy the result
Copy a single UUID or the whole batch to your clipboard.
UUID at a glance
| Aspect | Detail |
|---|---|
| Length | 128 bits, shown as 36 characters (32 hex digits + 4 hyphens) |
| Version 4 | Random — the default, collision-resistant general-purpose ID |
| Format | 8-4-4-4-12 hexadecimal groups, e.g. 550e8400-e29b-41d4-a716-446655440000 |
| Randomness | Web Crypto CSPRNG — cryptographically strong |
Generation is fully client-side and RFC 9562-compliant.
Frequently asked questions
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