You appended ten domains and erased four hundred.

You appended ten domains and erased four hundred.

The myth: the disavow tool adds your new entries to the existing list.

Actually, every upload replaces the entire file. There is no append. Upload a fresh ten-line file and your previous four hundred lines are gone the moment you confirm.

Reality: this is the single most common operational disaster in disavow work — someone pulls a quick list, uploads it, and silently undoes a year of cleanup.

The failure mode is treating the tool like a form that remembers. It doesn't. It's a full-file swap, every time.

The fix: always download the current file first, edit that exact file, then re-upload the complete version. Keep it version-controlled. Never upload a partial list against a live property.

Reality check: upload is overwrite, not merge — assume it every single time.