Compress images inside the PDF
Reduce image resolution
Convert images to grayscale
Remove unnecessary pages
Delete embedded fonts
Subset fonts instead of embedding full fonts
Optimize PDF for web
Remove metadata and hidden data
Flatten annotations and form fields
Remove bookmarks, comments, and attachments
Use PDF compression tools
Save as a reduced-size PDF
Re-export the PDF with lower quality settings
Convert scanned pages to text with OCR
Split large PDFs into smaller files
Use vector graphics instead of high-resolution images
Avoid duplicate images and objects
Use a newer PDF compression format
Reduce transparency and effects
Rebuild the PDF from the source file with smaller settings