.NET Short Unique Identifier

Question

I need a unique identifier in .NET (cannot use GUID as it is too long for this case).

Do people think that the algorithm used here is a good candidate or do you have

Answer 1

    public static string ToTinyUuid(this Guid guid)
    {
        return Convert.ToBase64String(guid.ToByteArray())[0..^2]  // remove trailing == padding 
            .Replace('+', '-')                          // escape (for filepath)
            .Replace('/', '_');                         // escape (for filepath)
    }

Usage

Guid.NewGuid().ToTinyUuid()

It's not rocket science to convert back, so I'll leave you that much.