About UUID & GUID v4 Generator
Generate standard Universally Unique Identifiers (UUID v4) for database primary keys, API tokens, and distributed systems. Supports bulk generation (up to 500 at once), formatting options, and hyphen removal.
Key Capabilities & Features
- Compliant RFC 4122 Version 4 UUID generation
- Bulk generation from 1 to 500 UUIDs in a single click
- Uppercase and lowercase formatting options
- Toggle hyphens on or off (raw 32-hex)
- 1-Click copy individual UUID or batch export
How to Use UUID & GUID v4 Generator
Choose Batch Size
Select how many UUIDs you need (1 to 500).
Select Formatting
Choose uppercase/lowercase and whether to include hyphens.
Generate & Copy
Click generate to produce fresh identifiers and copy.
Privacy & In-Browser Execution Guarantee
Generated locally using window.crypto.getRandomValues. Zero external transmission.
Frequently Asked Questions
Can two UUID v4 values ever collide?
The probability of a collision in UUID v4 is practically zero ($2^{-122}$). Generating billions of UUIDs per second for decades would still yield a negligible collision risk.
What is the difference between UUID v1, v4, and v7?
UUID v1 uses timestamps and MAC addresses; UUID v4 is pure cryptographic randomness; UUID v7 is time-ordered for optimal database B-tree indexing.
Are UUIDs safe to expose in public URLs?
Yes. UUID v4 contains no sequential data or hardware identifiers, preventing attackers from predicting neighboring record IDs or enumerating resources.