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UUID Generator
Generate RFC 4122 UUID v4 values. A browser-based developer tool that runs entirely client-side — no data is sent to our servers, no account required.
Use UUID Generator now
Free — open instantly, no account needed.
What it does
The UUID Generator is designed for developers who need to generate rfc 4122 uuid v4 values quickly and accurately, without setting up local tools or depending on third-party services.
Whether you're working in math & hashing or integrating it into a broader development pipeline, this tool saves time and reduces the risk of manual errors. All processing runs in your browser — your data never leaves your machine.
- ► Accelerating development workflows with instant output
- ► Reducing boilerplate and repetitive manual configuration tasks
Key features
- ✓RFC 4122 version 4 (random) UUID
- ✓Cryptographically random using crypto.getRandomValues()
- ✓Standard format: xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx
- ✓Used as primary keys, request IDs, idempotency keys
- ✓No two generated UUIDs should ever collide
Example
Generate a v4 UUID
Output
f47ac10b-58cc-4372-a567-0e02b2c3d479
How to use it
- Open UUID Generator by clicking on it in the Dev-Belt dashboard.
- Enter your input in the provided fields — all processing happens instantly in your browser.
- Copy the output using the Copy button, or paste it directly into your project.
- No sign-in required — the tool is ready to use immediately on page load.
When to use this in your project
Primary keys in a database
Use UUIDs instead of sequential integers to avoid exposing record counts and enable distributed ID generation without coordination.
Idempotency keys for APIs
Payment and job APIs use idempotency keys to prevent duplicate operations — generate one per request.
File naming in object storage
Avoid name collisions in S3/GCS by using a UUID prefix — guarantees uniqueness across all clients and services.
Developer notes
!All processing runs in your browser — no input is sent to Dev-Belt servers.
!This is a free tool — no account or sign-in required.
!If output does not match your expectations, check input encoding (UTF-8 vs ASCII) and whether trailing newlines are present.
Privacy & Security
All Dev-Belt tools run 100% in your browser using client-side JavaScript. Your input data is never sent to our servers, never logged, and never stored. This includes code snippets, credentials, tokens, API keys, and any other sensitive information you enter. We only track authentication events for account management — never tool usage, search queries, or input data.
Related keywords
uuidguidunique-idrandom
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246 Developer Tools — One Dashboard
UUID Generator is one of 246 browser-based tools on Dev-Belt. Free tools work instantly — no account required. Pro unlocks the full suite at $12/month.