Use a PDF compressor tool
Reduce image resolution
Compress images inside the PDF
Remove unnecessary pages
Delete embedded fonts
Convert images to grayscale
Save the PDF as optimized or reduced size
Remove annotations and comments
Flatten form fields and layers
Use “Print to PDF” with lower quality settings
Re-export the document with smaller image settings
Split large PDFs into smaller files
Remove duplicate or unused objects
Use a PDF editor’s “Optimize PDF” feature