ToolPDFsUUID Generator
Generate secure UUIDs with your browser's built-in crypto support.
Generates RFC 4122 UUIDs using `crypto.randomUUID()` in the browser.
Output
66c0923d-bd5b-473b-b685-9589f1b33017 61e7892e-5cea-457a-b759-98be33337663 a9c2f461-c5e8-48f6-90b2-c91002e34a0b 715f9c04-64ec-4d9f-8939-6aeb00994511 42c01cf5-2332-46d6-8554-b6b131300cee
How it works
A UUID (Universally Unique Identifier) is a 128-bit identifier standardised by RFC 4122 that is used to uniquely tag database rows, API resources, session tokens, file names, and event IDs without requiring coordination between systems. Two correctly generated UUIDs have an astronomically low probability of colliding, making them safe for distributed systems, microservices, and identifiers generated on the client.
ToolPDFs UUID Generator creates Version 4 UUIDs using the browser native Web Crypto API via crypto.randomUUID(). This is the same cryptographic random source used by operating systems for key generation. The generated UUIDs are returned instantly in the standard hyphenated format and can be copied to the clipboard with one click. You can generate multiple UUIDs per session.
No UUID is logged or sent anywhere. The tool runs entirely in your browser and is free with no account required.
Features
- Generates Version 4 UUIDs using the browser Web Crypto API for true randomness.
- Returns UUIDs in the standard RFC 4122 hyphenated format.
- Generate multiple UUIDs in a single session.
- One click copy to clipboard.
- Nothing is logged or transmitted. Runs entirely in your browser.
Frequently asked questions
What is a Version 4 UUID?
Version 4 is the most common UUID type. It is generated using a cryptographically secure random number source, with a few bits set to identify the version and variant. It does not encode the time or MAC address.
Are UUID collisions a real risk?
In practice, no. The probability of generating the same Version 4 UUID twice is astronomically small, roughly one in 5.3 undecillion. For most applications the collision risk can be treated as zero.
Can I use these UUIDs in a production database?
Yes. The UUIDs are generated using the browser cryptographic random source, which meets the randomness requirements of RFC 4122. They are suitable for database primary keys, API resource IDs, and session tokens.
Is there a limit to how many UUIDs I can generate?
No. Generate as many as you need during a session.
Why use a UUID instead of a sequential integer?
UUIDs can be generated anywhere in a distributed system without a central authority assigning IDs. They also do not expose the total number of records in your system the way sequential integers do.