Start with preserve mode. Size savings depend on your PDF; keep your original and review the result.
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Image-based compression replaces each page with a picture. It removes selectable/searchable text and interactive forms, can remove links and accessibility information, and reduces visual quality. Keep the original. A smaller file is not guaranteed.
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Individual tools are free: 2 successful export actions per day, with no promotional watermark. A split or image ZIP counts as one export action.