What is a UUID?
A UUID is a 128-bit universally unique identifier, usually written in five hexadecimal groups. It helps identify records, events, files, sessions and distributed entities without relying on a central sequence.
Tool for developers
UUID v4 Generator
Generate UUID v4 identifiers in seconds for tests, APIs, databases, logs and automation. Generation runs locally in the browser with the Web Crypto API.
Client-side: generated UUIDs are not sent to the server.
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Result
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History
The tool is structured for v1 or v7 in the future, but today it prioritizes correct and secure UUID v4 generation.
Generate 1 to 100 UUIDs at once.
The UUID is generated as canonical v4; formatting only changes the output you copy or download.
Ready to generate UUIDs.
Generated UUIDs
100% in browserGenerated UUIDs will appear here.
Session history
localThis session history will appear after the first generation.
How to use the UUID generator
- Choose how many UUIDs you want to generate.
- Click Generate to create UUID v4 values locally in the browser.
- Copy one item, copy all items or download a .txt file with the results.
When to use UUIDs
Use UUIDs when you need to create identifiers outside the database, integrate different systems, avoid collisions in distributed data, expose IDs in APIs or prepare realistic test data for development and QA.
UUID v4 in practice
UUID v4 is based on cryptographic randomness. This tool uses crypto.randomUUID() when available and a crypto.getRandomValues() fallback, preserving the required version 4 and RFC 4122 variant bits.
UUIDs in databases and APIs
In databases, UUIDs can be public keys, correlation IDs or external identifiers. In APIs, they reduce predictability of numeric IDs and help track requests, webhooks and events.
Real examples for developers
Use UUIDs for request_id in logs, idempotency_key in payments, queue job IDs, upload identifiers, test fixtures, local environment seeds and public references in REST endpoints.
Frequently asked questions
Are UUIDs sent to the server?
No. Generation, copy actions, session history and download happen in the browser.
Which UUID version does the tool generate?
The tool generates UUID v4, the most common option for secure random identifiers.
Can I generate multiple UUIDs at once?
Yes. Choose a quantity between 1 and 100, then copy or download all results.
Is history saved permanently?
No. It is local to the browser session and is not stored in the Utinix backend.
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recorded generations