UUID Generator

Generate random UUID v4 and GUID values for databases, API fixtures, tests and application records. Everything runs locally in your browser.

Generated UUIDs

Generated UUIDs appear here.

Browser-native crypto

The tool uses crypto.randomUUID when available and falls back to Web Crypto random bytes in older compatible browsers.

UUID and GUID formats

Use lowercase UUIDs for APIs and databases, uppercase GUIDs for Microsoft-style tooling, or hyphenless values when a system requires compact IDs.

Private by default

Generated IDs stay on your device unless you copy and use them somewhere else. No upload endpoint is used.

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Frequently Asked Questions

What is a UUID?

A UUID is a 128-bit identifier commonly used in databases, APIs, logs and distributed systems. Version 4 UUIDs are random identifiers.

Are UUID and GUID the same thing?

For most practical use, yes. GUID is the Microsoft name for the same 128-bit identifier format that UUID describes.

Does this UUID generator upload anything?

No. UUID generation runs in your browser using browser-native crypto APIs. No generated value is sent to Convertr servers.

Can I generate multiple UUIDs at once?

Yes. Use the quantity field to create up to 100 UUIDs in one click.

UUID Generator

Generate random UUID version 4 values for records, fixtures, and test data.

Input
A requested count and letter-case choice.
Output
RFC 4122-style UUID v4 strings ready to copy or download.
Real limitations
Random UUIDs are not sequential, human-friendly, or a substitute for authorization; uniqueness is probabilistic rather than guaranteed.
Privacy and data handling
a requested count and letter-case choice is processed in this browser tab. Convertr does not receive or store it; closing or reloading the page clears the working state unless the tool explicitly offers a local download.

How to use this tool

  1. Provide a requested count and letter-case choice in the tool controls.
  2. Choose the settings that affect RFC 4122-style UUID v4 strings ready to copy or download, then run the tool.
  3. Review RFC 4122-style UUID v4 strings ready to copy or download before copying or downloading it.

Common failure modes

A browser without secure random generation cannot create values, and very large counts are limited to protect the tab.

Useful example

Generate five lowercase UUID v4 identifiers for seed records in a development database.