Use “Save As” or “Export” with a smaller file size preset
Reduce image resolution before creating the PDF
Compress images inside the PDF
Convert images to JPEG instead of PNG when possible
Remove unnecessary embedded fonts
Subset fonts instead of embedding full font files
Delete unused pages
Remove hidden layers, comments, and annotations
Flatten transparency
Reduce page dimensions if possible
Convert color images to grayscale when appropriate
Optimize PDF for web or screen rather than print
Avoid scanned pages at very high DPI
Use OCR on scanned documents and resave with compression
Remove duplicate or unnecessary objects
Downsample large images
Recreate the PDF from the source file with lighter export settings
Use PDF compression tools or editor optimization features
Split large PDFs into smaller files if suitable
Avoid attaching large files inside the PDF
Use vector graphics instead of high-resolution raster images when possible