Docly practical guide
How to Reduce PDF File Size
Large PDFs are usually caused by high-resolution scans and uncompressed images. Choosing the right compression level can preserve readability while making the document easier to upload and share.
Steps to compress a PDF
Add your file to PDF Compress and choose a compression level. The balanced setting is a practical first attempt because it targets a useful compromise between file size and image quality.
After processing, compare the new size and inspect small text, signatures, stamps and tables. If the file is still above the limit, create another copy with stronger compression.
Choosing a compression level
Medium compression is often suitable for documents viewed on screen. Use light compression for print, technical drawings or long-term archives. Strong compression may be necessary for strict upload limits, but review fine visual details afterwards.
What makes a PDF large?
Scans above 300 DPI, full-page photographs, unnecessary colour data and embedded fonts can add substantial size. For text-only scans, grayscale or black-and-white capture can create smaller files from the start.
Quick checklist
- ✓Keep the original and share a compressed copy.
- ✓Check the portal's MB limit before processing.
- ✓Avoid repeatedly compressing the same output; restart from the original.
Tools in this guide
Frequently asked questions
Does PDF compression damage text?
The text layer is usually preserved; visible changes mainly affect scanned images and photographs.
Why is my PDF so large?
High-resolution scans, photographs and uncompressed images are the most common causes.