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How to Reduce the Size of PDF Files

Sometimes, to email a large PDF file, or upload it on the Internet for sharing successfully, it is very necessary to reduce the PDF file size. Some email services limit the size of an attachment. And it takes a long time to load a large PDF file at the web. To ensure everything goes on smoothly, let’s learn how to reduce a PDF file size.

When reducing a PDF file size is mentioned, the first thing you should do is to find a professional PDF tool. I haven't seen how to reduce PDF file size without a tool. On a Mac, you can try the pre-loaded Preview to compress PDF file size. On a Windows PC, you should Wondershare PDF Editor which will reduce your PDF file size by compressing images on the PDF file and removing unnecessary data. Below I'll show you how to reducing a PDF file size with Wondershare PDF Editor.

Step 1. Download and install the PDF Size Reducer

Click the download button to download and install the PDF application for PC. After installing the app, launch it on your computer.

Download Win Version

Step 2. Reduce the PDF file size

Click Open to open the PDF file that you want to reduce its size. And then click File menu to choose Optimize. From here, you can see preset options of image quality in the PDF file. Choose the proper one according to what you will use the PDF for. Or if these preset options can't meet your requirements, you can also click Custom to set the settings manually.

reduce PDF file size

The below screenshot is the window for set settings manually.

reduce PDF file size on Windows PC

Step 3. Save the PDF file

After selecting the image quality option or setting the settings by yourself, you should click Save As to save the PDF file as a new copy. Please replace the new copy with the original one in case you'll need the original one in the future. That's it!

Download Wondershare PDF Editor to reduce PDF file size right now!

Download Win Version

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