Compress the PDF using an online PDF compressor
Reduce image quality or resolution before saving the PDF
Remove unnecessary pages from the PDF
Delete unused fonts, objects, and metadata
Save the PDF with a lower quality setting
Convert images in the PDF to a smaller file format
Use “Save As” or “Optimize PDF” in a PDF editor
Split the PDF into smaller files
Recreate the PDF with smaller source files
Convert the PDF to a different format and back if needed