tumbler
Pro "software, find free resources and download and install it on your computer.
2. Then we find a PDF file that needs to be compressed. Let's look at the capacity before compression. What we see is 195K.
3. Open the file, click Document and select Optimized Scanned PDF from the drop-down menu.
4. We can see that moving the slider to the left can reduce the quality of the PDF, and the PDF can be compressed accordingly.
Let's try to move the slider to the left. After clicking OK, we can see that the document is indeed compressed a little, but it is not obvious. But if it is a document with many pictures, the effect should be remarkable.