How PDF size reduction works
This browser tool renders each PDF page as a JPEG image and rebuilds a new PDF. It checks progressively lower image resolutions and quality settings, then saves the first copy that is smaller than the selected source file.
Because pages become images, editable and searchable text is not retained as text. Forms, links, vector graphics, and digital signatures are not preserved as their original PDF objects. Small type and fine lines can become harder to read. Open the copy and compare it with the original before using it.
The result depends on the file. If none of the generated copies is smaller than the original, the tool reports that no smaller copy was produced and does not download a larger file.