What is UUID Generator?

Our UUID Generator creates version 4 Universally Unique Identifiers — 128-bit values rendered in the canonical 8-4-4-4-12 hexadecimal format, like 550e8400-e29b-41d4-a716-446655440000. A v4 UUID carries 122 bits of cryptographically secure randomness (6 bits encode the version and variant), so each one is for all practical purposes unique with no central registry needed.

Databases, APIs, and distributed systems depend on exactly this: two servers on opposite sides of the planet can each mint a UUID locally at the same moment and be confident the IDs will never collide.

How to use

1. Choose how many UUIDs you need — one for a quick test, or a batch of dozens for seeding a table.
2. Click generate; each UUID is produced instantly from your browser's cryptographically secure random source.
3. Pick your output format: standard hyphenated form, or without hyphens for systems that expect a compact 32-character hex token.
4. Copy individual UUIDs or the whole batch and paste them as primary keys, request IDs, or correlation IDs in your code.

Common use cases

• Database primary keys: a backend developer designing a multi-region Postgres schema uses UUID primary keys so rows created on any node never clash when replicated.
• API request tracing: a DevOps engineer assigns each incoming request a UUID as a correlation ID, so logs from a dozen microservices can be joined on that single value.
• Test fixtures: a QA engineer seeding a staging database generates a batch of UUIDs as user IDs, order IDs, and session tokens.
• File and upload naming: a developer handling user uploads renames each file to a UUID, eliminating filename collisions and leaking no information about upload order or user identity.

FAQs

What is the difference between UUID v1 and v4?

Version 1 UUIDs embed the generator's MAC address and a timestamp, leaking hardware identity and creation time. Version 4 is pure randomness — no machine or time information — which is why v4 is the default for APIs, public IDs, and distributed keys.

Can two UUIDs ever collide?

Theoretically yes, practically no. With 122 random bits, you'd need to generate about a billion UUIDs per second for a century to reach even a 50% chance of one duplicate. For every real-world purpose, v4 UUIDs are unique.

Can I use UUIDs as passwords or secret tokens?

A v4 UUID has 122 bits of entropy, and stripping the hyphens gives a clean 32-character hex token suitable for API keys or password-reset tokens. The caveat: transmit each token over HTTPS and store only a hash server-side — the UUID format itself is not the security mechanism.

Do I need an account, and is anything stored?

No account, no signup, no install. UUIDs are generated locally in your browser from its secure random source and never touch a server, so nothing is logged or stored — safe even for pre-production secrets.