Use a PDF compressor tool
Reduce image resolution
Convert images to JPEG instead of PNG
Remove unnecessary images
Delete unused pages
Remove embedded fonts if possible
Subset embedded fonts
Remove metadata and hidden data
Flatten annotations and form fields
Optimize for web viewing
Save the PDF as a reduced-size version
Print to PDF with lower quality settings
Use OCR only when needed
Compress scanned pages
Convert color pages to grayscale
Reduce page size
Remove bookmarks and links if not needed
Use a newer PDF version with better compression
Split large PDFs into smaller files