Compress images before creating the PDF
Reduce image resolution in the PDF
Convert images to JPEG instead of PNG when possible
Remove unnecessary pages
Delete unused fonts
Embed only required fonts
Flatten layers and transparency
Remove annotations, comments, and form data
Optimize for web or screen instead of print
Use PDF compression tools or “Reduce File Size” options
Re-save the PDF with a smaller export setting
Convert scanned pages to black-and-white if suitable
Crop unnecessary margins and white space
Avoid high-resolution graphics when not needed
Split large PDFs into smaller files if appropriate