Reduce file size with default settings

By Cynthia, 2 December, 2025

You can use the Reduce File Size command to quickly optimize documents with the default settings, which are suitable for a wide range of documents. With this command, you can also reduce file size for multiple files at the same time. To reduce file size with default settings, do as the following:

  1. Choose File > PDF Optimizer > Reduce File Size.
  2. To apply the settings to the current file, choose Current File. A dialog box pops up. 

    1) Under PDF Version Compatibility, choose Retain existing to keep the current PDF version, or choose a desired PDF version from the drop-down menu. See also PDF Versions

    2) Under Compression, choose the compression effect that you need. You can click the Estimate Compression Size button to see the estimated file size after the compression for different compression effects.

    3) Then click OK.

    4) Specify the file name and the location to save the optimized file in the pop-up dialog box. Then click Save to start the optimization.

  3. (Optional) To apply the settings to multiple files, choose File > PDF Optimizer > Reduce File Size > Multiple Files. In the pop-up Reduce File Size dialog box, do the following:

    1) Click Add Files to add files, folders, or currently opened files. (Tip: You can also add files by dragging and dropping the PDF files you want to optimize to the box.) Use Move up, Move down, and Remove to adjust the order of the files. 

    2) Choose a compression effect that you need. You can click the Estimate Compression Size button to see the estimated file size after the compression for different compression effects.

    3) Choose a PDF version for compatibility from the drop-down menu. 

    4) Click Output Options…, and the Output Options dialog box pops up where you can select the destination folder and choose how to name the new files and whether to overwrite existing ones. Click OK to exit the dialog box. 

    5) Then click OK in the Reduce File Size dialog box to start the optimization.

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