About this tool
About GUID Generator
Use this online GUID generator to create one random GUID or a batch of up to 500 UUID v4-compatible values for Windows applications, databases, APIs, test fixtures and configuration files. Choose the exact display style your destination expects, then copy individual values or download the list as TXT.
GUID and UUID terminology
GUID means Globally Unique Identifier. Microsoft commonly uses GUID terminology, while standards and many other platforms use UUID. A random GUID normally has the same 128-bit structure as a UUID v4; the practical difference is often how software displays or accepts the value. Use the UUID v4 Generator when the target documentation specifically asks for UUID rather than GUID.
Choose a GUID format
Keep the standard 8-4-4-4-12 hyphen layout for broad compatibility. Switch to uppercase when matching Windows examples, remove hyphens for a compact field, or add braces when an API, registry entry or configuration format expects them.
Generate GUIDs in bulk
Create up to 500 values at once. The browser cryptography API supplies secure random bytes, and the tool sets the UUID version and variant bits before applying your selected display format. For database keys that should roughly follow creation order, compare this output with the UUID v7 Generator or ULID Generator.
GUID format examples
A standard GUID has five hexadecimal groups in an 8-4-4-4-12 layout, for example 550e8400-e29b-41d4-a716-446655440000. A compact representation removes hyphens, while Windows software may expect uppercase values inside braces. Formatting changes the representation rather than the identifier's value.
Use the UUID Generator for standard UUID v4 output, or compare the UUID v7 Generator when creation-time ordering matters. Confirm the accepted format in your application before importing a large batch.
GUIDs are identifiers, not secrets
A random GUID collision is extremely unlikely, but important databases should still enforce uniqueness. GUIDs are not passwords or authorization tokens. Use the Nil UUID Generator only when you explicitly need an empty all-zero placeholder.