UUID / GUID Generator.
Generate, validate, and decode UUIDs instantly. Fully client-side — nothing ever leaves your browser.
UUID Validator
Why Use This UUID Generator?
UUIDs are the standard way to create globally unique identifiers without a central authority. Our generator uses the browser's native Web Crypto API for true randomness.
Cryptographically Random: Uses crypto.randomUUID() — the Web Crypto API standard built into every modern browser, producing genuine v4 UUIDs.
Bulk & Formatted: Generate up to 100 UUIDs at once and export them in the exact format your codebase needs — plain, braced, quoted, or comma-separated.
Built-in Validator: Instantly check any UUID for validity and get version detection (v1/v3/v4/v5) plus a visual anatomy breakdown.
How to Use the UUID Generator
Set your count: use the number input or +/- buttons to choose 1–100 UUIDs, then click Generate.
Pick your format: toggle uppercase/lowercase, hyphens on/off, and choose plain, braced, quoted, or comma output.
Copy or download: click Copy All to grab everything, click any individual UUID to copy it, or Download .txt for a file.
Validate a UUID: paste any UUID into the Validator box to instantly see if it's valid and which version it is.
Frequently Asked Questions
What is a UUID?
A UUID (Universally Unique Identifier) is a 128-bit label standardised by RFC 4122. It is written as 32 hexadecimal digits in 5 hyphen-separated groups, e.g. 550e8400-e29b-41d4-a716-446655440000.
What is the difference between UUID v1 and v4?
v1 UUIDs embed a timestamp and MAC address, making them partially sequential. v4 UUIDs are completely random, which is why they are preferred for privacy and unpredictability.
Are these UUIDs truly unique?
In practice, yes. The probability of two random v4 UUIDs colliding is astronomically small — about 1 in 5.3 × 10³⁶ for any pair.
Is it safe to use UUIDs as database primary keys?
Yes. UUIDs are a very common primary key choice for distributed systems because they can be generated independently by any service without coordination.
What does GUID mean?
GUID stands for Globally Unique Identifier — Microsoft's term for the same concept. A GUID and a UUID are technically identical.
What is the variant field in a UUID?
The variant field (bits 64–65) identifies the UUID layout. RFC 4122 UUIDs use variant '10', meaning the two most significant bits of segment 4 are always '10' in binary — which is why the first character of segment 4 is always 8, 9, a, or b.
Can I use these UUIDs in production code?
Yes. The UUIDs are generated with crypto.randomUUID(), a CSPRNG available in all modern browsers and Node.js 14.17+. They are standards-compliant RFC 4122 v4 UUIDs.