Random UUID Generator (Generate V4 UUIDs Online)
Need unique identifiers for your database rows, API requests, or testing? This tool generates highly secure, random Version 4 UUIDs (Universally Unique Identifiers) using your browser's native Web Crypto API. Generate up to 100 at a time, format them with or without hyphens, and copy them all instantly.
100% Private & Secure
This tool runs completely inside your browser using client-side WebAssembly and JS. Zero data is ever sent to our servers.
UUIDs are generated securely using the native Web Crypto API (crypto.randomUUID) on this device.
How to use this tool
- Select the number of UUIDs you want to generate (up to 100 at once).
- Choose your preferred format (standard with hyphens or no hyphens).
- Select the casing (lowercase or UPPERCASE).
- Click 'Generate UUIDs' to create a fresh batch.
- Click 'Copy to Clipboard' to instantly copy the entire list.
Example Usage
Standard Lowercase (V4)
123e4567-e89b-12d3-a456-426614174000
Standard Uppercase (V4)
123E4567-E89B-12D3-A456-426614174000
No Hyphens
123e4567e89b12d3a456426614174000
When to use this tool
- Generating unique primary keys for SQL or NoSQL database records.
- Creating unique transaction IDs or idempotency keys for REST APIs.
- Mocking massive amounts of realistic test data.
- Generating obscure, non-sequential unguessable tokens.
Frequently Asked Questions
What is a UUID?
UUID stands for Universally Unique Identifier. It is a 128-bit label used for information in computer systems. Standard UUIDs are represented as 32 hexadecimal characters, displayed in 5 groups separated by hyphens.
What version of UUID does this tool generate?
This tool generates UUIDv4 (Version 4). Version 4 UUIDs are completely randomized, meaning they are generated primarily from cryptographic pseudo-random number generators rather than MAC addresses or timestamps. This makes them perfectly suited for almost all modern development use cases.
Are the UUIDs truly random and secure?
Yes. This tool utilizes the native window.crypto.randomUUID() Web API built directly into your internet browser. It provides cryptographically secure pseudo-randomness, ensuring the identifiers are mathematically virtually guaranteed to be unique.
Are these UUIDs sent to your servers?
No. The entire generation process happens locally in your device's memory. No identifiers are ever transmitted across a network or saved, guaranteeing 100% privacy and security for your projects.