UUID & GUID Generator (v4)
Generate cryptographically secure RFC 4122 compliant UUID (v4) strings directly in your browser without any network requests.
About UUID v4 (Universally Unique Identifier)
What is a UUID?
A UUID (Universally Unique Identifier) is a 128-bit number standardized by RFC 4122 to uniquely identify information across computer systems without requiring central coordination.
Security & Privacy
This tool uses your browser's native crypto.getRandomValues() Web API to generate cryptographically secure pseudorandom numbers. Your generated UUIDs are processed 100% locally and are never stored or transmitted.
📖 Detailed Guide & Use Cases
Generate RFC 4122 compliant Version-4 Universally Unique Identifiers (UUIDs) and Globally Unique Identifiers (GUIDs). Generate single or bulk batches of UUIDs with uppercase/lowercase formatting and hyphen toggles.