Find and delete the empty pages in a PDF automatically. This is aimed at scanner output, where feeding a double-sided stack through leaves a blank page for every sheet that only had content on one side. Because a scanned blank is rarely pure white, the detection has an adjustable threshold so that dust, speckle and faint show-through from the other side are still treated as blank.
Those pages carry more marks than the threshold allows - usually scanner noise, a punch hole shadow or ink showing through from the reverse. Making the detection less strict will catch them.
A page holding only a faint mark, a thin line or a small logo can fall under the threshold. Tighten the setting so less is treated as blank, then re-run.
Yes, and it is more reliable there, because a genuinely empty page in a generated PDF has no content at all and no noise to work around.
Files are uploaded over an encrypted connection and processed on CoonTool's own server, not in your browser. The working copy is deleted automatically once the job is done, and in any case within 24 hours. Nothing is stored permanently and no account is required.