Remove unnecessary pages
Compress images before adding them to the PDF
Lower image resolution
Use grayscale instead of color if possible
Remove embedded fonts you do not need
Subset fonts instead of embedding full font files
Delete unused objects, layers, and metadata
Optimize the PDF with a PDF editor
Save the file as a reduced-size or optimized PDF
Use “Print to PDF” with smaller quality settings
Convert scanned pages to black and white
Split large PDFs into smaller files
Avoid using high-resolution images
Re-export the document with lower quality settings
Use PDF compression tools or online compressors