Use a PDF compressor tool
Reduce image resolution
Compress embedded images
Remove unnecessary pages
Delete unused objects and metadata
Optimize for web viewing
Convert images to grayscale
Lower the PDF quality setting when exporting
Use a smaller font subset
Flatten annotations and form fields
Remove embedded fonts if possible
Save the PDF as an optimized version
Recreate the PDF with lower compression settings
Split large PDFs into smaller files
Use a different file format if PDF is not required