UUID / GUID Generator
Generate RFC 4122 compliant version 4 UUIDs individually or in bulk with zero latency.
ihatetools / developer / uuid-generator
UUID v4 Generator
Quantity & Formatting Options
Count:
Generated 0 UUIDs
How it works
01
Select Quantity & Formats
Choose how many UUIDs to produce (up to 500) and toggle uppercase, braces, or hyphens.
02
Cryptographic Generation
UUIDs are created using crypto.randomUUID() or high-entropy CSPRNG bytes conforming to RFC 4122 v4.
03
Copy or Export
Copy individual IDs, copy the entire list, or download as a TXT/JSON file instantly.
Frequently Asked Questions
This tool generates Version 4 (v4) UUIDs based on cryptographically secure pseudorandom numbers according to RFC 4122.
With 122 bits of random entropy, the probability of generating a duplicate v4 UUID is roughly 1 in 5.3 x 10^36, making collisions mathematically negligible.
No. All generation happens locally within your browser using the Web Crypto API with zero network communication.