How much smaller will my PDF be?

Typical reduction is 40–80% depending on the content. Image-heavy PDFs see the biggest improvements. Already-optimized PDFs may see minimal change.

Will compression reduce the quality?

The Recommended preset balances size and quality well. Maximum compression reduces images to screen resolution (72dpi). Minimum keeps high quality at 300dpi.

What are the compression presets?

Recommended (good balance, ~72dpi images), Maximum (smallest file, lower image quality), and Minimum (light compression, 300dpi, high quality).

What if my PDF is already small?

If compression would make the file larger, we return your original file with a message that it is already well-optimized.

Compress PDF — Reduce PDF File Size

Reduce PDF file size by up to 80% without losing quality. Perfect for email attachments.

Drag & drop files here

or click to browse · PDF · max 25MB

How to use Compress PDF

1
Upload
Upload the PDF file you want to compress.
2
Choose quality
Select a compression level: Recommended, Maximum, or Minimum.
3
Download
Download your compressed PDF and see the size reduction.

Frequently asked questions

How much smaller will my PDF be?: Typical reduction is 40–80% depending on the content. Image-heavy PDFs see the biggest improvements. Already-optimized PDFs may see minimal change.
Will compression reduce the quality?: The Recommended preset balances size and quality well. Maximum compression reduces images to screen resolution (72dpi). Minimum keeps high quality at 300dpi.
What are the compression presets?: Recommended (good balance, ~72dpi images), Maximum (smallest file, lower image quality), and Minimum (light compression, 300dpi, high quality).
What if my PDF is already small?: If compression would make the file larger, we return your original file with a message that it is already well-optimized.

More PDF tools

Need more? Generate documents with AI

After using Compress PDF, take it further — let ZenDoc AI edit, improve, or generate entirely new documents from your content.

Edit before compressing? Use AI