Why some PDFs barely shrink
Text-heavy files and PDFs already saved with efficient compression have little redundant data. Repeatedly compressing a PDF will not always make it smaller. If the result is no smaller, keep the original.
11 ZONE COMPRESS PDF
PDF Tips
Practical reading for lighter documents.
Choose the right compression mode
Start with Recommended for everyday sharing. Use High Quality for photographs or detailed diagrams. Strong Compression reduces compatible images more aggressively, so inspect small labels and image detail afterward.
A simple document-sharing checklist
Keep the original, choose a clear filename, check every page in the compressed copy and confirm the recipient’s attachment limit. If a PDF is password-protected or signed, obtain an appropriate unsigned, unencrypted copy before optimization.