How to Compress a PDF Without Losing Too Much Quality

What makes a PDF large

High-resolution scans and photographs usually account for most of a PDF's size. Embedded fonts, duplicated assets, and unnecessary pages can also add weight, but image resolution is normally the first setting worth checking.

Choose a useful quality target

Compression is a tradeoff: smaller files discard more image detail. Use a moderate setting for documents that contain diagrams, small labels, signatures, or photographed text. Stronger compression is better suited to screen-only drafts.

Always judge the downloaded result at 100% zoom. Check fine text and image-heavy pages instead of relying only on the new file size.

• Keep the original file.
• Test a moderate setting first.
• Check searchable text and clickable links after processing.
• Use the compressed copy only when it meets the destination's size limit.

Reduce size before compression

Delete unnecessary pages, crop oversized scan margins, and avoid merging duplicate documents. These changes can reduce size without degrading the content users need to read.