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Developer Security & Identity Tool

Free Bulk UUID / GUID v4 Generator

Generate cryptographically secure Version-4 UUIDs (Universally Unique Identifiers) in bulk with custom casing, hyphenation, braces, and 128-bit browser randomness.

Workflow

What Makes UUID v4 Collision-Proof?

128 Bits of Pure Entropy

A Version 4 UUID has 122 random bits, yielding 5.3 × 10³⁶ possible combinations (virtually impossible to collide).

Hardware Web Crypto

Generated using `crypto.getRandomValues()` directly in your device CPU, bypassing insecure pseudo-random math.

Database Primary Keys

Ideal for PostgreSQL, MongoDB, distributed microservices, and session tokens without sequential ID leaks.

FAQ

Frequently Asked Questions

They are functionally identical. **UUID** (Universally Unique Identifier) is the open IETF standard RFC 4122, while **GUID** (Globally Unique Identifier) is Microsoft's implementation term used extensively in Windows, COM, and .NET.

The odds are virtually zero. Even if a computer system generated 1 billion UUIDs every second for 100 years consecutive, the probability of creating a duplicate UUID is only about 50%.

Sequential IDs (1, 2, 3...) expose business metrics to scrapers (like your total user count or order volume) and make insecure direct object reference (IDOR) attacks easier. UUIDs are cryptographically unpredictable and can be generated concurrently across multiple distributed microservices without waiting on a central database lock.

Never. Every UUID generated on this page is produced directly inside your browser using the local JavaScript crypto.randomUUID() or crypto.getRandomValues() API. Nothing is transmitted or logged.
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