Create unique identifiers for databases, APIs and files: random version 4 or sortable version 7, in the format you need, and check any existing UUID.
Your files never leave your device
A UUID (also called GUID) is a 128-bit identifier written as 32 hexadecimal characters, such as 3f2a…-…. It is so unlikely to repeat that it can be created anywhere without a central register.
Yes in practice. Version 4 has 122 random bits from your device’s cryptographic generator; a repeat is astronomically unlikely.
They are the same thing. GUID is the name Microsoft uses, often written in upper case with braces.
v7 is usually better for primary keys because new values sort in time order, which keeps indexes efficient.
Yes, up to 1000 per click. Copy them all or save them as a text file.
No. They are created on your device and are not saved or sent.
Yes for versions 1 and 7. Paste it in the checker to see when it was created.