🆔 UUID / ULID Generator

Generate UUID v1, v4, and v7 instantly. Bulk generate up to 100 UUIDs at once. Free online UUID generator — cryptographically random, runs entirely in your browser.

Type

Count

Uppercase

How to Use

Choose type and count

Select UUID v4 or ULID from the type selector, then set the count (1–20).

Click Generate

Press Generate to instantly create cryptographically secure identifiers.

Copy your IDs

Click the Copy button next to any ID, or use Copy All to copy the entire list.

Frequently Asked Questions

What is a UUID? +

A UUID (Universally Unique Identifier) is a 128-bit label used to uniquely identify objects in software. UUID v4 is randomly generated, producing IDs like "550e8400-e29b-41d4-a716-446655440000". The probability of collision is astronomically low.

What is the difference between UUID v4 and other UUID versions? +

UUID v1 is based on time and MAC address. UUID v3 and v5 are name-based using MD5/SHA-1 hashes. UUID v4 is fully random and is the most commonly used version for databases and distributed systems.

What is a ULID? +

ULID (Universally Unique Lexicographically Sortable Identifier) is an alternative to UUID that is sortable by creation time. It is 26 characters in Crockford Base32. The first 10 characters encode millisecond timestamp, the remaining 16 are random.

Are generated UUIDs truly unique? +

UUID v4 uses cryptographic randomness (crypto.getRandomValues). The probability of generating a duplicate UUID is 1 in 5.3×10^36 — effectively zero for all practical purposes.

Is any data sent to a server? +

No. UUIDs and ULIDs are generated entirely in your browser using the Web Crypto API. Nothing is sent to any server.

संपूर्ण गाइड: UUID Generator

UUID Generator क्या है?

UUID (Universally Unique Identifier) Generator RFC 4122 compliant unique identifiers बनाता है। UUIDs 128-bit values हैं जो globally unique होते हैं — दो independently generated UUIDs के same होने की probability astronomically low होती है। Format: xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx।

Database primary keys, session IDs, API keys, distributed system node IDs, और file names के लिए ideal। UUID v4 (random) सबसे commonly used है; UUID v7 time-ordered है जो database indexing के लिए better है।

कैसे उपयोग करें

Version select करें: v4 (random) या v7 (time-ordered)।
Quantity set करें bulk generation के लिए।
Generate click करें — UUIDs list में appear होंगे।
Copy all करें bulk use के लिए।

Pro Tips

UUID v7 use करें database primary keys के लिए — sequential nature से index fragmentation कम होता है।
UUIDs को lowercase store करें — case-insensitive comparison से bugs avoid होते हैं।
Hyphens के साथ standard format (8-4-4-4-12) maintain करें interoperability के लिए।