Compress images before creating the PDF
Reduce image resolution in the PDF
Convert color images to grayscale when possible
Remove unnecessary embedded fonts
Subset fonts instead of embedding full font files
Delete unused pages
Remove blank pages
Remove hidden objects and unused metadata
Optimize the PDF with a compression tool
Save the PDF using “reduced size” or “optimized” settings
Use a lower-quality scan setting for scanned documents
Convert large images to JPEG instead of lossless formats
Flatten transparency and layers
Remove annotations, comments, and form fields if not needed
Split large PDFs into smaller files
Re-export the document with smaller file size settings
Use PDF compression software or online compressors
Avoid embedding unnecessary attachments
Use vector graphics instead of high-resolution raster images when possible