Free UUID Generator
Generate RFC 4122-compliant Version 4 universally unique identifiers (UUIDs) with cryptographically strong randomness. Each UUID is a 128-bit value displayed in the standard 36-character format (8-4-4-4-12). Supports batch generation from 1 to 100 UUIDs at once with individual copy buttons for each ID and a convenient "Copy All" button to grab the entire batch. Ideal for software developers assigning unique database primary keys, system architects designing distributed system identifiers, QA engineers creating test data with unique IDs, application developers generating session tokens or transaction IDs, and anyone needing collision-resistant unique identifiers without a central authority.
How to Use
- Set the quantity with the number field - generate 1 to 100 UUIDs in a single batch
- Click Generate to produce new random UUIDs instantly
- Copy individually using the copy button next to each UUID
- Or click Copy All to copy the entire batch to your clipboard
Features
- Batch generation - 1 to 100 UUIDs at once
- Individual copy buttons for each UUID
- Copy All button for bulk clipboard copy
- Standard UUID v4 format (8-4-4-4-12 hex digits)
- Cryptographically random using browser's crypto API
What Makes UUID v4 Useful
UUID v4 values are random identifiers that can be created independently by different systems without asking a central server for the next number. This is useful for distributed databases, offline-first apps, temporary test data, event IDs, and import jobs where sequential IDs could collide or reveal business volume.
Collision and Safety Notes
A UUID v4 contains 122 random bits after the version and variant bits are reserved. That creates an extremely large identifier space, but good engineering still treats uniqueness as something to verify. If a UUID is used as a database key, keep a unique constraint in place. If it is used as a security token, make sure the surrounding workflow also checks authorization, expiration, and storage safety.
Privacy
All UUID generation happens locally in your browser through the Web Crypto API. No generated IDs are transmitted to a ClickTooly server, and the page works offline after it has loaded.
Last reviewed: July 2026.