PDF compression guide: reduce file size without losing clarity
Use this guide to keep PDFs lightweight while protecting readability, layout, and image quality.
PDF size grows quickly with images, scans, and embedded fonts. Compression helps shrink files without rebuilding the document.
Use the checklist below to pick the right compression level and avoid common quality issues.
If you also need to reorder or remove pages, do that first to keep compression focused.
When to compress a PDF
- Email attachments fail or get blocked by size limits.
- Uploads are slow or rejected by portals and forms.
- Shared storage has strict size quotas.
- You need faster downloads for mobile viewers.
Compression levels explained
Quality first
Light compression that keeps text sharp and images clean.
Best for: print-ready documents and contracts.
Balanced
A practical mix of size savings and quality retention.
Best for: reports, handouts, and sharing.
Size first
Aggressive compression for the smallest possible file.
Best for: email limits and quick sharing.
Pre-compression checklist
- 1Remove blank pages or unnecessary sections.
- 2Split large files if only part of the PDF is needed.
- 3Choose a compression level based on the audience.
- 4Preview the output to confirm readability.
- 5Keep the original file as a backup.
Common issues and quick fixes
Text looks soft or blurry
Switch to a lighter compression level and re-export if needed.
File size barely changes
Text-only PDFs compress less. Remove images or split the file.
Output file is larger
Compression is content-dependent. Use the original if it stays smaller.
Ready to compress?
Open the compressor and choose the level that fits your use case.
Open PDF Compressor