The short, honest version.

Use the tools for anything lawful. Your files are yours; what the tools produce from them is yours too.

No promises of perfection. The tools are free and provided as-is. Keep a copy of anything important. Every tool works on a copy of your file, but that’s your safety net, not a guarantee.

Be reasonable. Rate limits exist so one script doesn’t eat the free thing everyone else uses.

This page is the short version, and it is the version that applies today. Longer formal terms will replace it before anything on this site is ever paid for.