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UUID Generator

Generate cryptographically random UUIDs v4 — bulk generation, instant, free

v4 (random)

🔒 Each UUID is cryptographically random and unique

About UUID Generator

UUID Generator is a free, browser-based utility built for developers and engineers who need a fast, reliable way to generate cryptographically random uuids v4 — bulk generation, instant, free. Whether you're debugging an API response, preparing data for deployment, or validating configuration files, this tool handles the job in seconds — with zero server calls. Everything runs locally in your browser, so your source code and data stay private.

How to Use

1
Select count Choose how many UUIDs to generate — from 1 up to 100 at once.
2
Choose format Select lowercase (e.g. a1b2c3d4...) or UPPERCASE (e.g. A1B2C3D4...) output.
3
Click "Generate" UUIDs appear instantly in the output box — one per line.
4
Copy all results Hit 📋 Copy All to copy every UUID to your clipboard in one click.
🔒 Privacy note: Uses crypto.randomUUID() — cryptographically secure. Collision probability is astronomically low (1 in 5.3×10^36 per pair).

Frequently Asked Questions

A UUID (Universally Unique Identifier) is a 128-bit identifier standardised by RFC 4122. It is represented as 32 hexadecimal digits displayed in five groups separated by hyphens: xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx. UUIDs are designed to be unique across space and time without requiring a central authority to assign them, making them ideal for distributed systems.
UUID v4 uses cryptographically secure random numbers for all bits except two fixed version bits (the 4 in the third group) and two variant bits. This tool uses the browser's built-in crypto.randomUUID() API, which draws from the operating system's cryptographically secure random number generator (CSPRNG) — the same source used for TLS keys and other security-sensitive operations.
Theoretically yes, but the probability is so small it is practically impossible. The chance of a collision between any two randomly generated v4 UUIDs is approximately 1 in 5.3×10^36. To have a 50% chance of a collision you would need to generate 2.71 quintillion (2.71×10^18) UUIDs — more than the estimated number of grains of sand on Earth.
UUIDs are used anywhere a unique identifier is needed without a centralised issuer: database primary keys (especially in distributed databases), REST API resource identifiers, session tokens, file names to avoid conflicts, idempotency keys in payment systems, tracking IDs in analytics, and correlation IDs in microservices logging.
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Tool Info
Category Developer
Privacy 🔒 Client-side
Version v4 (RFC 4122)
Max Batch 100 UUIDs
Cost Free