UUID Generator - Free Online Tool | PivaBox

Generate UUID v4 identifiers in bulk, copy to clipboard

UUID Generator — Generate UUID v4 Identifiers in Bulk for Development and Databases

1. Set the number of UUIDs you want to generate using the count input (1–100). UUIDs are 128-bit universally unique identifiers generated using the browser's built-in cryptographic random number generator (crypto.randomUUID()).
2. Click Generate to create cryptographically random UUID v4 identifiers. Each UUID follows the standard 8-4-4-4-12 hexadecimal format (e.g., 550e8400-e29b-41d4-a716-446655440000), with version 4 indicated by the first digit of the third group.
3. Click any individual UUID to copy it to your clipboard, or use Copy All to copy the entire list at once. Generated UUIDs are perfect for database primary keys, API request IDs, session tokens, file names, and distributed system identifiers.

Frequently Asked Questions

Is the UUID Generator free to use?

Yes, PivaBox UUID Generator is completely free. Generate as many UUIDs as you need — there are no usage limits, no account requirements, and no hidden fees. Ideal for developers who need quick UUIDs during prototyping, testing, or production setup.

Are my generated UUIDs uploaded to any server?

No. All UUID generation happens entirely in your browser using the built-in <code>crypto.randomUUID()</code> Web API — the same cryptographic-quality entropy source used by SSL/TLS encryption. Your identifiers never leave your device, which is critical when generating IDs for security-sensitive applications, authentication tokens, or proprietary database schemas.

What is UUID v4, what are the different UUID versions, and when should I use each?

UUID (Universally Unique Identifier) is a 128-bit value standardized by RFC 9562. Version 4 UUIDs are generated from random numbers — they are the most commonly used variant because they require no coordination with a central authority. The UUID format is 32 hexadecimal digits in five groups: 8-4-4-4-12. The UUID standard defines several versions: v1 (time-based, includes MAC address — privacy concern), v3 (MD5 hash of namespace + name), v4 (random — most popular, this tool), v5 (SHA-1 hash of namespace + name), v7 (time-ordered, ideal for database primary keys because they sort naturally). Use v4 for general-purpose unique IDs, session tokens, and API keys. Use v7 for database primary keys where index locality matters (PostgreSQL, MySQL/InnoDB). Use v5 when you need deterministic IDs derived from existing data. UUIDs are preferred over auto-incrementing integers in distributed systems because they can be generated independently across multiple servers without collisions. One UUID collision would require generating 1 billion UUIDs per second for 85 years to have a 50% probability — they are practically guaranteed unique.