To compress PDF files using , you can choose between a quick online tool or advanced desktop software. While Foxit PDF Reader is free for viewing and basic edits, it does include a built-in compression feature

. To compress files for free, you should use Foxit's online service or the 14-day free trial of Foxit PDF Editor Method 1: Foxit Online PDF Compressor (Free & Fast)

This is the best option for quick, one-off compressions without installing software. : Navigate to the Foxit Online PDF Compressor : Drag and drop your file (up to

) into the compression box or click to select from your device. Start Compression

." Foxit automatically optimizes the file while maintaining text and image clarity. : Once complete, click " Download Your File " to save the smaller PDF to your computer. Method 2: Foxit PDF Editor Desktop (Advanced Control)

If you need to compress large batches or require specific settings (like reducing image DPI), use the Foxit PDF Editor desktop application. You can use its 14-day free trial for these features. Quick Compression (Default Settings) Open your file in Foxit PDF Editor PDF Optimizer Reduce File Size Current File to apply default optimization. Advanced Optimization (Custom Settings) Compress PDF Files Online for Free: Reduce PDF Size | Foxit

How to Reduce a PDF File Size Online * 1. Drag and drop your PDF file onto our online PDF compressor. * Click 'Start Compression', How to make a PDF file size smaller (reduce any PDF size)


3. Convert to "PDF/A" (If applicable)

In the "Save As" menu, saving as PDF/A (archival format) sometimes normalizes elements and reduces size, though generally, standard PDF compression is better.

Feature Name: Smart PDF Compressor (Free Tier)

Goal

Add a free, built-in PDF compression feature to Foxit Reader/PhantomPDF that produces small file sizes while preserving acceptable visual quality and keeping the workflow simple for non-technical users.

Algorithm summary:

1. Recompress images (JPEG quality 40–75 / PNG quantization)
2. Downsample images (max 150 DPI for screen option)
3. Remove duplicate objects, unused metadata, embedded thumbnails
4. Flatten annotations & forms (optional)
5. Convert CMYK → RGB (if only for screen)
6. Remove JavaScript, embedded files, old revisions