Are the UUIDs truly random?

Yes. They are generated using the browser's built-in WebCrypto API (crypto.getRandomValues), which provides cryptographically strong random bytes — the same source used for encryption keys.

Is any data sent to a server?

No. All UUID generation happens entirely in your browser. Nothing is transmitted to Top10k or any third party.

What UUID version does this tool generate?

This tool generates UUID v4, the most widely used version. It uses 122 random bits with four bits set to identify the version (4) and two bits set to identify the variant (RFC 4122).

Can I generate duplicate UUIDs?

In theory, duplicates are possible, but the probability is astronomically low — roughly 1 in 5.3 × 10^36. In practice you will never encounter a collision in normal use.

How many UUIDs can I generate at once?

You can generate between 1 and 100 UUIDs per batch. For larger volumes, click "Generate" multiple times or adjust the count and regenerate.

What format is the output?

Each UUID is a lowercase string in the standard 8-4-4-4-12 hyphenated format, e.g. 550e8400-e29b-41d4-a716-446655440000.

Random UUID Generator

Name: Random UUID Generator
Availability: InStock
Author: Nham Vu

Generate cryptographically secure random UUID v4 values instantly in your browser using the WebCrypto API.

Options

Number of UUIDs

Cryptographically secure

100% client-side, no server

RFC 4122 v4 compliant

Generated UUIDs 0 UUIDs

Click Generate to create UUIDs

Copied!

Summary

Generate cryptographically secure random UUID v4 values instantly in your browser using the WebCrypto API.

How it works

Choose how many UUIDs to generate (1 to 100).
Click "Generate" to create the UUIDs instantly using your browser's WebCrypto API.
Each UUID follows the RFC 4122 v4 format: xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx.
Click any UUID to copy it to your clipboard, or use "Copy All" to grab the full list.
Use "Clear" to reset the list and start fresh.

Use cases

Generate unique database primary keys during development or testing.
Create unique identifiers for distributed systems and microservices.
Produce test data with guaranteed unique IDs for QA workflows.
Generate correlation IDs for log tracing across services.
Create unique file or object names in storage systems.
Prototype API payloads that require valid UUID fields.

Frequently Asked Questions

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Last updated: 2026-05-28 · Reviewed by Nham Vu