Compress PDF

Compress PDF online for free. Shrink your pdf's file size in seconds — fast, secure, and with no software to install.

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Drop your PDF file here
or click to choose — files stay private and are deleted automatically

How to shrink your PDF's file size

  1. Step 1Upload your PDF file. Drag and drop it into the box above, or click to browse your device.
  2. Step 2PDF4 will shrink your PDF's file size automatically — processing runs in seconds, no settings to fiddle with.
  3. Step 3Download your compressed PDF. Files are sent over a secure connection and deleted automatically within a few hours.

Frequently asked questions

Is the Compress PDF tool free to use?

Yes. You can shrink your PDF's file size right here online for free — no account, email, or credit card required. Sign up only if you want higher limits, larger files, or API access.

Are my files safe and private?

Yes. Uploads travel over an encrypted HTTPS connection, are processed on our servers, and are automatically deleted within a few hours. We never share or sell your documents.

Do I need to install any software?

No. PDF4 works entirely in your web browser, so there is nothing to download or install. It runs on Windows, macOS, Linux, Android, and iOS.

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