Use a PDF compressor tool or app
Reduce image resolution before saving the PDF
Re-save the PDF with “Optimize” or “Reduce File Size” options
Remove unnecessary pages
Delete unused fonts and embedded objects
Convert images to JPEG instead of PNG when possible
Lower the quality of embedded images
Flatten annotations, forms, and layers
Use “Save As” instead of repeated edits and saves
Compress the PDF in Adobe Acrobat or similar software
Use online PDF compression services
Print the PDF to a new PDF with smaller settings
Split large PDFs into smaller files
Remove duplicate or hidden content
Export the document with smaller file settings from the source app