Compress PDF Files

Why PDF file sizes vary

A document with many high-resolution photographs or scanned pages can be much larger than a text-only PDF. Embedded fonts, color images, and repeated graphics also add bytes. Compression results depend on how the original file was made; a PDF that is already optimized may not become smaller.

Keep a copy of the original when image detail or selectable text matters. After compression, open the new file and inspect small print, diagrams, signatures, and photographs at the zoom level the recipient will use.

Reduce size without losing important detail

Start with only the pages you need: use Split PDF before compressing a large report or application. For future document scans, choose a resolution suitable for reading rather than scanning every page as a high-resolution photograph. Color scans can be larger than grayscale pages, but changing color or resolution may affect how stamps and annotations appear.

A size target is not a promise that every document can reach that exact number while staying readable. If a form has a strict upload limit, check its instructions and compare the downloaded result before submitting. Do not repeatedly compress an already compressed copy when clarity is important.

Text and image quality after compression

This tool re-saves the PDF structure; it does not rasterize pages or reduce image resolution. Text remains part of the PDF rather than being turned into page pictures. Because embedded scans and photographs may already be compressed, some documents will show little or no size reduction. When the optimized copy would be larger, the original is kept unchanged.