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Developer Tools

UUID Generator

Pure Frontend No Upload Crypto-Secure Random Bulk Generation
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Generate

Generate UUIDs / GUIDs free online. Supports versions v4, v7 and batch generation up to 1000, with uppercase and hyphen options. 100% private — uses cryptographically secure randomness, never leaves your browser.

What is a UUID?

A UUID (Universally Unique Identifier) is a 128-bit identifier used to uniquely identify data in distributed systems — such as database primary keys, API request IDs, and session tokens. v4 uses random numbers with an astronomically low collision rate; v7 prepends a timestamp so values sort by time, improving database index performance.

Tips

Crypto-Secure Random

This tool uses the browser's Web Crypto API (crypto.getRandomValues), producing cryptographically secure randomness — not Math.random — suitable for session tokens, reset links, and other sensitive scenarios.

Choose the Right Version

For general use pick v4 (random, unpredictable). For database primary keys where index performance matters, pick v7 (time-ordered); ULID is shorter and sortable. Generate any quantity in bulk.

Privacy

All IDs are generated locally in your browser with no server requests, and work offline. Safe for generating test fixtures on locked-down or air-gapped machines.

Common Use Cases

Database Keys

Generate unique primary keys for distributed systems

API Identifiers

Create unique tracking IDs for requests and sessions

Test Fixtures

Bulk-generate large sets of random IDs for development

FAQ

Is a UUID guaranteed unique?

UUID v4 has 122 bits of random entropy — a collision probability of about 1 in 5.3×10^36 — effectively unique in practice. v7 combines a timestamp with randomness and is practically impossible to duplicate.

What is the difference between v4 and v7?

v4 is fully random and unpredictable, ideal for externally exposed IDs. v7 begins with a current timestamp so values sort chronologically, making it more efficient as an indexed primary key.

Are the IDs sent to your server?

No. Everything is generated in your browser via the Web Crypto API with no network requests, and nothing is logged or stored.