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 and subset fonts
Save the PDF as a reduced-size version
Print to PDF with lower quality settings
Convert scanned pages to grayscale
Convert color pages to black and white
Use OCR only when needed
Split large PDFs into smaller files
Remove embedded attachments
Use a smaller page size if possible