How to Compress PDF Without Losing Quality

Compress PDFs without sacrificing readability

Reducing PDF size is essential for email, web publishing, and storage. The secret is to remove excess weight while keeping the content crisp and usable.

What to compress first

• Images are usually the largest part of a PDF. Downsample them to 150–200 DPI for screen use.
• Fonts can often be subset to remove unused characters, which cuts file size without changing text appearance.
• Unneeded metadata, bookmarks, and embedded thumbnails can also be removed safely.

Use compression wisely

Preserving quality means choosing the right compression settings. For photos, JPEG compression works well if you keep the quality level high enough, and for line art, lossless compression is often best.

With SmashPDF, you can test compression levels instantly and download a preview so you can compare file size to visual quality before sharing.