Generate cryptographically random UUID v4 identifiers instantly. Generate single or bulk UUIDs formatted with or without hyphens. Useful for database keys, session IDs, and unique tokens.
Key Features
Generates RFC 4122 compliant version 4 (random) UUID identifiers
Cryptographically secure random number generation (CSPRNG)
Bulk generation capability producing up to 500 UUIDs in one click
Formatting options for uppercase, lowercase, with or without hyphens
How to Use
Select how many UUIDs you wish to generate.
Choose formatting options (hyphens vs compact, uppercase vs lowercase).
Click "Generate UUIDs" to produce new identifiers.
Review the generated list in the output box.
Copy individual UUIDs or the entire batch to your clipboard.
Example
Sample input
(generate — no input required)
Sample output
550e8400-e29b-41d4-a716-446655440000
Edge Cases
Version 4 random vs version 1 time-based
Uppercase vs lowercase hex
Nil UUID 00000000-0000-0000-0000-000000000000
Frequently Asked Questions
What is a UUID v4 and how random is it?
A UUID v4 is a 128-bit identifier with 122 bits of cryptographic entropy. The probability of generating a duplicate UUID is so infinitesimally small that collisions are practically impossible.
Are these UUIDs safe to use as primary keys in databases?
Yes. UUIDs eliminate ID enumeration risks and allow distributed systems to generate unique keys independently without database locks.
What is the standard format of a UUID v4?
The canonical format is 32 hexadecimal characters separated into five groups: 8-4-4-4-12 (e.g. 123e4567-e89b-12d3-a456-426614174000).
Privacy notice: when you run this tool, your input is sent over HTTPS to our server, processed in memory and returned. It is not stored or logged. Avoid pasting live secrets such as private keys or passwords.