PDF file is too large, there are several possibilities,

1, the picture itself is too large, for example, the pixels are too high, or the size is too large, resulting in a large PDF.

Solution: In PS, available? Action? This function can reduce all the pictures at once. Then turn to PDF.

2. Aiming at the existing PDF compression. Two methods:

A. save as-compressed file. ? This function is in Acrobat? There should be more than nine.

B. Reprint PDF. Open the PDF and press ctrl? +? p？ Do the following, you can choose the "minimum file"? , or "print", or define it yourself.