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GUID generator

GUID is simply Microsoft's name for the exact same 128-bit identifier format the rest of the industry calls a UUID — this page exists because .NET, SQL Server and Windows developers search for "GUID", and everything generated here is a standard RFC 9562 v4 identifier that works anywhere either name is expected.

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How to use this tool

  1. Pick how many you need

    A preset (1, 10, 25, 100) or any number up to 100.

  2. Set formatting options

    Toggle uppercase and hyphens to match what SQL Server, .NET or your config expects.

  3. Copy one or copy all

    Each row has its own copy button, or grab the whole batch at once.

Questions people ask

What is the actual difference between a GUID and a UUID?

None, practically speaking — GUID (Globally Unique Identifier) is the name Microsoft used when it adopted the same 128-bit format that the rest of the industry, following RFC 9562, calls a UUID. A GUID generated here works identically anywhere a UUID column, parameter or field is expected.

Does SQL Server expect a particular GUID format?

SQL Server's NEWID() and uniqueidentifier columns expect the standard hyphenated, lowercase-or-uppercase-either-way format this tool produces by default — toggle uppercase on if your specific tooling or style guide expects capital hex digits.

Can I generate GUIDs without the hyphens, for a .NET string literal?

Yes — turn off the hyphens option and you get the same 32 hex characters run together, which is the format some .NET code and config files expect instead of the hyphenated form.

Are these GUIDs actually random, or predictable?

They come from crypto.randomUUID() (or crypto.getRandomValues() as a fallback) — the browser's cryptographically secure random source, the same one used for encryption keys, not the predictable Math.random().

Can two GUIDs ever collide?

With 122 random bits per identifier, the odds are astronomically small — you would need to generate billions of GUIDs per second for decades before expecting a single collision.

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