UUID Generator — Free Online Tool
Generate unique UUIDs (v1 and v4) online for free. Bulk generate multiple UUIDs, copy individually or all at once. No signup required.
About UUID Generator
UUIDs (Universally Unique Identifiers) are 128-bit identifiers guaranteed to be unique across space and time without a central registry. They are essential in software development for database primary keys, session tokens, transaction IDs, file names, and API request tracing. Our generator produces both Version 1 UUIDs (time-based) and Version 4 UUIDs (randomly generated — the most common type). Generate a single UUID or up to 1000 at once in standard hyphenated format or without hyphens.
Frequently Asked Questions
What is the difference between UUID v1 and v4?
v1 is time-based and includes a timestamp. v4 is randomly generated. v4 is recommended for most use cases.
Are the generated UUIDs truly unique?
v4 UUIDs have 2^122 possible values — the probability of collision is negligible.
Can I generate multiple UUIDs at once?
Yes — generate up to 1000 UUIDs in bulk and copy them all at once.
Can I get UUIDs without hyphens?
Yes — toggle the hyphen format to get compact 32-character strings.
Are these generated securely?
Yes — v4 UUIDs use cryptographically secure random number generation.