Compress PDF Online

Make a PDF smaller. Light keeps your text selectable; Strong turns pages into pictures for big scans.

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How to use Compress PDF

Shrink a PDF for email or upload forms. Light mode tidies the file and keeps text; Strong mode rebuilds each page as a compressed picture, which helps most for scanned documents.

  1. Add your PDF.
  2. Choose Light (keeps text) or Strong (pages become pictures).
  3. For Strong, pick the picture detail (72, 110 or 150 dpi) and JPG quality.
  4. Press Start. If the result is not smaller, we keep your original and say so.

Why use Compress PDF here

  • Light and Strong modes
  • Adjustable detail and quality for Strong
  • Never makes the file bigger: keeps the original instead

Frequently asked questions

Why did my PDF not get smaller?

Light mode only tidies the structure, so already-efficient PDFs may not shrink. Try Strong, which re-encodes every page as a picture.

What is the downside of Strong?

Pages become pictures, so text is no longer selectable or searchable. It works best for scans, which are pictures already.

Which dpi should I choose?

72 is smallest, 110 is a good balance for reading on screen, and 150 is sharper for printing.

Is Compress PDF free?

Yes, and you do not need an account. The free plan allows up to 20 MB and 5 files at a time, and 10 free uses a day. After that you can come back tomorrow or choose a plan. The paid plans (Plus and Pro) remove the wait and raise the file size limit to 250 MB and 500 MB.

Do I need to install anything?

No. Open the page and use it. There is nothing to install, and it works on phones, tablets and computers.

What if something goes wrong?

Open Support from the menu at the top of the page and tell us what happened. A use that fails is not counted against your limit.

Does it work on my phone?

Yes. It works in current versions of Chrome, Safari, Edge and Firefox on phones, tablets and computers. Very large files can be slow on older phones.

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