What is a UUID generator online?

A UUID generator creates random, RFC 4122-compliant Version 4 UUIDs (Universally Unique Identifiers) — 128-bit identifiers used as database primary keys, session tokens, and file names.

Is this UUID generator free with no signup?

Yes — 100% free. Generate 1 to 100 UUIDs at once in standard, no-hyphen, or uppercase formats. Runs entirely in your browser.

UUID Generator — Free Online Tool (2026)

Use UUID Generator for free — generate random v4 uuids in bulk. This tool runs 100% in your browser with zero server uploads. Part of ZeroApiTools, a collection of 65+ free developer tools. No signup, no API keys, no data collection. Works offline.

ZeroApiTools' free UUID Generator Online creates random, RFC 4122-compliant Version 4 UUIDs in bulk — instantly, in your browser, with no server, no API calls, and no signup required.

What is a UUID Generator?

A UUID (Universally Unique Identifier) Generator creates random 128-bit identifiers in the format `xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx`. Version 4 UUIDs are generated using random numbers, making collisions statistically impossible, making them ideal as primary keys, session IDs, and file names.

How to Use the UUID Generator on ZeroApiTools?

Enter how many UUIDs you want to generate (1 to 100 at a time).
Select your preferred format: standard with hyphens, without hyphens, or UPPERCASE.
Click Generate and copy individual UUIDs or copy all at once to your clipboard.

Is a UUID the same as a GUID?

Yes. GUID (Globally Unique Identifier) is Microsoft's term for UUID. They follow the same standard and are fully interchangeable. Both have the same format and collision probability.

Are generated UUIDs truly unique?

Version 4 UUIDs are generated from 122 bits of randomness, making the probability of a collision astronomically low (1 in 5.3×10^36). For practical purposes, every generated UUID can be treated as globally unique.