Generate version 4 UUIDs from your browser's cryptographic random source. Produce one or a few thousand at a time, in lowercase, uppercase, braced or hyphen-free form, and copy the lot in one click.
A v4 UUID has 122 random bits. You would need to generate about 2.7 x 10^18 of them before a 50% chance of any collision - roughly a billion a second for 85 years. In practice you can treat them as unique.
v4 is entirely random. v7 puts a millisecond timestamp in the leading bits, so UUIDs sort chronologically. That makes v7 much friendlier to database indexes, because inserts land at the end of the B-tree instead of scattering across it.