Generate UUID v4 (random), v7 (time-ordered, and the right default for a database key these days), v1, and the name-based v3 and v5 — plus ULID and NanoID when you want something shorter.
Take up to a thousand at a time, choose hyphens, braces, case, quotes, commas, Base64 or URL encoding, and copy or download the batch. Every identifier is generated in your browser from its cryptographic random source; nothing is requested from a server.