Open the PDF in the PDF editor of Eofent Capture, choose Compress PDF, pick a level and press Preview. In the video a two page scan goes from 3.9 MB to 174 KB.
7 SCHRITTE · CHROME UND EDGE
DIESE ANLEITUNG GIBT ES VORERST AUF ENGLISCH
Open the PDF tab, press Open a PDF and pick the file.
You will find it under PDF tools in the list on the left.

Small shrinks scans the most, and Best quality keeps more detail. You can also set the resolution for scanned pages in dpi.

The panel shows the size before and after, with a preview of the first page next to the original.
GUT ZU WISSEN
Scanned pages shrink a lot. Pages of real text shrink little, because most of their size is text and fonts already.
This keeps the smaller version as a step you can undo.
GUT ZU WISSEN
The new file keeps every page and its text, but not bookmarks or form fields.
Nothing is written to your disk until you save or export.
The smaller file lands in your Downloads folder.

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