UUID Generator — Free
Generate version 4 UUIDs (random) instantly. Bulk generation, copy individually or all at once.
UUID v4
Version 4 UUIDs use random bits, making collisions astronomically unlikely.
Bulk generation
Generate up to 100 UUIDs at once and copy them all in one click.
Fully private
Uses the browser's built-in crypto API. Nothing leaves your device.
What is a UUID?
A UUID (Universally Unique Identifier) is a 128-bit value, usually written as 32 hexadecimal characters split into five groups (like 550e8400-e29b-41d4-a716-446655440000), designed to be unique across systems without any central coordination. Pixvert's UUID generator creates version 4 UUIDs — the random-based version most commonly used in software.
Version 4 UUIDs are generated using random or pseudo-random numbers, and the probability of two generated UUIDs colliding is so astronomically low that they're treated as guaranteed-unique in practice — used as database primary keys, session identifiers, file names, and request tracking IDs across countless independent systems.
This generator uses `crypto.randomUUID()`, the standard browser API for cryptographically strong UUID generation, and supports bulk generation of up to 100 at once, plus formatting options like uppercase letters or removing the dashes.
How to generate a UUID
- 1
Set the quantity — choose how many UUIDs you need, up to 100 at once
- 2
Choose formatting options — toggle uppercase letters or remove dashes if your use case requires it
- 3
Generate — UUIDs are created instantly using the browser's crypto API
- 4
Copy all — copy the full list with one click, ready to paste into code, a database, or a spreadsheet
When to use a UUID generator
Database primary keys
Generate unique IDs for records that need to be unique across distributed systems without a central counter.
API request tracing
Create a unique identifier to trace a single request across multiple services or logs.
Test data and seed scripts
Quickly generate a batch of realistic unique IDs for populating a development or test database.
File and session naming
Use a UUID as a unique, collision-free file name or session token.
Why use Pixvert's UUID generator?
- ✓Cryptographically random: built on crypto.randomUUID(), the standard secure browser API
- ✓Bulk generation: generate up to 100 UUIDs at once instead of one at a time
- ✓Formatting options: uppercase or no-dash variants to match your system's requirements
- ✓100% local, free, no signup: UUIDs are generated in your browser and never logged
Frequently Asked Questions
What UUID version does this tool generate?
Version 4, which is generated using random numbers rather than being derived from a timestamp or hardware address — the most commonly used version in modern software.
How likely is a UUID collision?
Extremely unlikely. With 122 random bits, you would need to generate roughly a trillion UUIDs per second for about 85 years before a 50% chance of any collision, per the UUID specification.
Are these UUIDs sent to a server or logged?
No, generation happens entirely in your browser using the Web Crypto API. Nothing is transmitted or stored.
Can I generate UUIDs without dashes?
Yes, toggle the no-dash option to get a compact 32-character hexadecimal string instead of the standard dashed format.
Can I generate more than 100 at once?
The tool caps bulk generation at 100 per batch. For larger volumes, run the generator multiple times or generate UUIDs programmatically in your own code.
Are these UUIDs suitable for production use?
Yes, they're generated using the same cryptographically secure random source browsers use elsewhere, making them suitable for real database keys, tokens, or identifiers.