How to Batch-Reduce PDF File Sizes with Action Wizard
Question details
The user needs to batch-reduce the size of multiple PDF files stored in a folder using an automated action, specifically ensuring that non-PDF files like Word or Excel documents are skipped during the process.

- Product
- Adobe Acrobat
- Device & OS
- not provided
- Scenario
- Applying a batch compression workflow to a mixed-format directory to optimize PDF file sizes without altering or causing errors on other document types.
- Observed behavior
- The user wants the batch processing configuration to exclusively target PDF files and systematically ignore all other file extensions in the selected folder.
Before initiating a batch compression task, review your folder's contents and ensure you have backed up the original high-resolution PDFs to avoid irreversible quality loss.
Configure Action Wizard to Filter for PDF Files Only
Set up the Action Wizard workflow to strictly accept and process only PDF extensions, bypassing other formats in the directory.
By adjusting the input settings of your batch sequence, you can prevent the tool from attempting to process unsupported files such as Word, Excel, or JPEG images, which commonly prevents workflow errors.
Launch Adobe Acrobat, navigate to the Tools menu, and select 'Action Wizard'.
Click on 'New Action' to build a custom workflow, or select an existing 'Reduce File Size' action and click 'Edit'.
Under the 'Files to be Processed' section, click the 'Add Folder' option. Once the folder is added, click the settings icon or prompt next to it to specify file types, and strictly select 'Adobe PDF Files (*.pdf)'.
Save the action and run it on a small sample folder containing mixed files to verify that only the PDFs are compressed and other file formats are skipped.

Isolate PDFs into a Dedicated Processing Folder
Manually separate your PDF files from other document types before running the batch compression action.
Batch Compress PDFs Easily with WPS Office
WPS Office provides an intuitive and fast PDF Compressor that directly handles batch size reduction without requiring complex workflow configurations. It intelligently targets PDF documents and shrinks them while maintaining excellent readability.
- 1. Launch WPS Office: Open WPS Office and navigate to the 'PDF' tab located on the home screen or left sidebar.
- 2. Select PDF Compress: Click on the 'PDF Compress' tool from the top menu or the dedicated PDF toolkit section.
- 3. Add Your Files: Click 'Add Files' or drag and drop your PDFs directly into the compression window. You can select multiple files at once.
- 4. Choose Compression Level: Select your preferred compression setting based on how much you need to reduce the file sizes.
- 5. Compress and Save: Click the 'Compress' button to securely batch-reduce the sizes of all added PDFs instantly.

Frequently Asked Questions
Will batch-compressing PDFs reduce their image and text quality?
Compression algorithms typically reduce the resolution of embedded images and strip out invisible metadata. While vector elements and text remain perfectly readable, rasterized images may lose some sharpness depending on the level of compression chosen.
Why does my batch compression tool stop or crash when it hits an Excel file?
If the software is attempting to apply PDF-specific size reduction algorithms to an unsupported format like an Excel spreadsheet, it will encounter a processing error. Filtering your input settings to only target .pdf extensions prevents this interruption.
Is there a free way to batch reduce PDF file sizes without advanced software?
Yes, comprehensive productivity suites like WPS Office offer built-in PDF compression tools that handle multiple files simultaneously, serving as a highly effective and free-to-use option compared to complex premium features.




