Generate Globally Unique Identifiers (GUIDs) instantly. Choose version, quantity, and format. All generation is client-side — nothing is sent to any server.
A GUID (Globally Unique Identifier) — also known as a UUID (Universally Unique Identifier) — is a 128-bit number used to uniquely identify information in computer systems. GUIDs are standardized by RFC 4122 and have a probability of collision so astronomically low they are considered unique for all practical purposes. They are widely used as primary keys in databases, correlation IDs in distributed systems, session tokens, and file identifiers.
Version 4 GUIDs use random or pseudo-random numbers for all 122 variable bits. They require no coordination between generators making them ideal for distributed systems.
Version 1 GUIDs incorporate the current timestamp and the host's MAC address. They are monotonically sortable by creation time, useful for time-ordered database records.
The standard format is xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx. Braces format wraps in curly braces for .NET/COM usage. No-hyphens removes separators for compact storage.
All GUIDs are generated entirely in your browser using the Web Crypto API. No data is transmitted to any server, making this tool safe for sensitive projects.