Compress images in the PDF
Reduce image resolution
Convert images to grayscale
Remove unnecessary pages
Delete embedded fonts
Subset embedded fonts
Remove unused objects and metadata
Save the PDF as an optimized or reduced-size version
Use a PDF compressor tool
Print to PDF with lower quality settings
Flatten annotations and form fields
Convert the PDF to a more efficient format if possible
Split large PDFs into smaller files
Recreate the PDF from source files with smaller export settings