UUID/GUID Generator

Not in practice. UUID (Universally Unique Identifier) is the name used in the official RFC 4122 standard, while GUID (Globally Unique Identifier) is Microsoft's name for its own implementation of essentially the same 128-bit format. Modern GUIDs and standard UUIDs are structurally identical — same length, same hyphen placement, same version/variant bits — so the terms are used interchangeably today, including by this tool.

Astronomically unlikely. A UUID v4 has 122 random bits (the other 6 bits are fixed to mark the version and variant), giving roughly 5.3 × 10^36 possible values. Even if you generated a billion UUID v4s every second, you'd need to run for far longer than the age of the universe before a 50% chance of any collision occurred. For virtually every real-world application, treating UUID v4 collisions as impossible is the correct engineering assumption.

Removing hyphens produces a compact 32-character hex string, which some systems expect for storage keys, filenames, or URL slugs. Wrapping in single quotes (e.g. 'uuid') is handy for pasting directly into a SQL INSERT statement, while wrapping in braces (e.g. {uuid}) matches the traditional .NET/COM GUID literal format used in C# and Windows registry entries. Toggle whichever matches where you're about to paste the value.

Every UUID here comes from crypto.randomUUID(), the same cryptographically secure random number generator (CSPRNG) built into modern browsers and used by most server-side UUID libraries under the hood — so there's no quality trade-off. Generating locally also means the identifiers you create (which might map to real database rows, test fixtures, or session tokens) are never transmitted anywhere or logged by a server, and you don't need to install a package for a one-off batch.