JavaScript UUID Generator
Generate RFC 4122 UUIDs (v4) using JavaScript’s crypto API. Produce one or many UUIDs instantly.
JavaScript UUID Generator
Powered byJavaScript & the Web Crypto API
All UUIDs are generated locally using crypto-safe randomness; nothing is sent to a server.
Set a count and click Generate to produce UUIDs.
Why generate UUIDs with JavaScript?
JavaScript is built into every browser. This tool uses it to generate RFC 4122 UUIDs locally without any backend required.
Cryptographically secure
This tool uses the browser's secure random source via crypto.randomUUID() when available.
Bulk generation
Generate from 1 to 1000 UUIDs at once and copy them in one click.
No tracking, no server
Everything happens locally in your browser; nothing is logged or transmitted.
What is a UUID?
A UUID (Universally Unique Identifier) is a 128-bit identifier standardized by RFC 4122. It is often displayed as a 36-character string with hyphens.
UUID v4 is generated randomly and is commonly used for database keys, API IDs, and distributed systems.
- 128 total bits (16 bytes)
- Format: 8-4-4-4-12 hex digits
- Version 4: random, with 122 random bits
- Useful for unique IDs without central coordination
UUID Format
32 bits
16 bits
16 bits
16 bits
48 bits
This tool generates UUIDs compliant with RFC 4122 version 4 (random) using the browser's crypto API.
UUID Versions Compared
All UUID versions are 128 bits, so they all follow the same formatting.
| Version | Generation Method | Use Case | Requires |
|---|---|---|---|
| v1 | Timestamp + MAC address | Time-ordered logging | Network interface |
| v2 | DCE security (UID/GID) | Legacy DCE systems | System identity |
| v3 | MD5 hash of namespace+name | Deterministic IDs | Namespace + name |
| v4 | Random | General purpose — UUID v4 Generator → | None |
| v5 | SHA-1 hash of namespace+name | Deterministic IDs (secure) | Namespace + name |
| v6 | Reordered timestamp (RFC 9562) | Sortable time-based IDs | Clock + node |
| v7 | Unix timestamp + random (RFC 9562) | Database-friendly sortable IDs | None |
Example UUIDs
Click an example to generate it instantly.
Frequently Asked Questions
Answers to common questions about generating UUIDs in JavaScript.
crypto.randomUUID() when available, which uses cryptographically secure randomness.
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