Use a PDF compressor tool
Reduce image resolution
Compress embedded images
Convert images to JPEG instead of PNG
Remove unnecessary pages
Delete unused objects and metadata
Flatten annotations and form fields
Optimize fonts
Save as a reduced-size PDF
Use “Save As” instead of repeated editing saves
Lower scan quality before creating the PDF
Convert color images to grayscale
Remove embedded attachments
Use PDF optimization settings in Adobe Acrobat or similar software
Split large PDFs into smaller files
Recreate the PDF from source files with smaller export settings