Use a PDF compressor tool
Reduce image resolution
Compress embedded images
Remove unnecessary pages
Delete unused objects and metadata
Save the PDF as an optimized version
Convert images to JPEG instead of PNG when suitable
Lower scan quality for scanned documents
Flatten annotations, forms, and layers
Remove embedded fonts if possible
Split large PDFs into smaller files
Export the PDF with smaller page dimensions
Use “Reduce File Size” or “Optimize PDF” in PDF software
Recreate the PDF with lower quality settings