QuickFnd Tool
UUID Generator
Generate universally unique identifiers (UUIDs) in various versions for use in databases, session IDs, and more.
UUID Generator
About UUID Generator
UUID Generator creates universally unique identifiers (UUIDs/GUIDs) instantly in your browser. Generate one or multiple v4 UUIDs — the standard for random, collision-resistant identifiers used in databases, APIs, and distributed systems.
Why use UUID Generator?
- Generate RFC 4122-compliant v4 UUIDs — statistically guaranteed to be unique.
- Copy individual UUIDs or generate batches for bulk database seeding.
- All generation is client-side using the browser crypto API — no server round-trip.
- Standard hyphenated format, no-hyphens, or uppercase options available.
How to use it
Click Generate UUID to create a new random UUID v4 instantly.
Click Copy to copy it to your clipboard.
Use the Bulk option to generate multiple UUIDs at once for batch operations.
Toggle format options if you need uppercase or non-hyphenated output.
Best use cases
Generating primary keys for database records in PostgreSQL, MySQL, or MongoDB
Creating unique session tokens or API keys for web applications
Seeding test databases with unique identifiers for development
Generating correlation IDs for distributed system tracing and logging
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UUID Generator Online
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Free UUID Generator
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Best UUID Generator
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Frequently asked questions
What is the difference between UUID v4 and other versions?
UUID v4 is randomly generated using cryptographic randomness with no structure or meaning. v1 includes a timestamp and MAC address. v5 is name-based. For most use cases, v4 is the right choice.
Can two generated UUIDs ever be the same?
In theory yes, but the probability is roughly 1 in 5.3 undecillion — effectively impossible in practice. UUIDs are considered collision-proof for all real-world applications.
Is UUID the same as GUID?
Yes. GUID (Globally Unique Identifier) is Microsoft's term for the same concept — same format, same 128-bit size, same collision resistance.
Are these safe to use as database primary keys?
Yes, UUID v4 is widely used as a primary key. Be aware that random UUIDs can cause index fragmentation in some databases. PostgreSQL handles this well; MySQL-heavy workloads may prefer time-ordered UUIDs.
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