Because .pak files are not a universal format, different game engines require different tools. If online tools fail, these are the standards:

: Since these tools run in a browser, a user on macOS or Linux can often extract files from a Windows-based game without needing a virtual machine.

As of today, a PAK file extractor that runs entirely online does not exist. The format is too fragmented, the technical hurdles too high, and the economics too poor (who pays for an ad-supported PAK extractor?).

For a truly functional online PAK extractor, a developer would need to solve three near-impossible problems: