Compress images before adding them to the PDF
Reduce image resolution
Use JPEG instead of PNG when possible
Remove unnecessary pages
Delete unused fonts and embedded files
Avoid embedding all fonts if not needed
Save the PDF as an optimized or reduced-size version
Use PDF compression tools or software
Flatten layers and transparency
Convert scanned pages to grayscale
Lower the quality of exported images
Remove comments, annotations, and form fields
Downsample high-resolution graphics
Recreate the PDF with smaller source files
Use a newer PDF compression method if supported