Use a PDF compressor tool
Reduce image resolution before creating the PDF
Compress embedded images
Remove unnecessary pages
Delete unused fonts
Remove embedded media and attachments
Save the PDF as optimized or reduced size
Use grayscale instead of color when possible
Lower scan quality for scanned documents
Convert images to JPEG instead of PNG when appropriate
Flatten annotations and form fields
Remove metadata and hidden data
Recreate the PDF with smaller page dimensions if possible
Split large PDFs into smaller files
Use “Print to PDF” with reduced quality settings