5 Ways to Reduce PDF File Size

Why Are PDF Files So Large?

The main reason is embedded high-resolution images. A single 300 DPI document scan can weigh 5-10 MB. A document with a dozen such scans quickly grows to hundreds of megabytes.

Method 1: Optimize Embedded Images

The most effective method. Images inside PDFs can be recompressed at lower quality — the difference is often imperceptible to the eye.

Method 2: Remove Unused Objects

PDF files often contain "junk": deleted pages, unused fonts, hidden layers. Our compression tool automatically removes them during re-saving.

Method 3: Reduce Quality for Web

For documents that will only be viewed on screen, 72-96 DPI is sufficient instead of the standard 300 DPI.

Method 4: Split and Re-merge

Sometimes it helps to split the PDF into parts, process each separately, and merge back.

Method 5: Proper Source File Format

When creating PDFs from images, use JPG to PDF with optimal quality settings.

Quality Recommendations

See also: Merge PDF, PDF to JPG, Protect PDF