PDF Compressor Online Tool

Reduce PDF file size by compressing images and optimizing content. Choose from high, medium, or low compression levels for optimal results.

Upload PDF File

Drag & drop PDF file here or click to browse

Supports PDF files (max 50MB)

document.pdf
0 KB

Compression Results

0 KB
Original Size
0 KB
Compressed Size
0%
Size Reduction
Download Compressed PDF

Compression results will appear here

Choose Compression Level

Low Compression

Minimal size reduction with high quality preservation. Best for documents with important images.

Recommended
Medium Compression

Balanced approach with moderate size reduction and acceptable quality loss.

Balanced
High Compression

Maximum size reduction with significant quality loss. Best for text-heavy documents.

Maximum

How to Use This PDF Compressor Tool

Compressing PDF Files

  1. Upload your PDF file using either:
    • Drag and drop into the upload area
    • Click to browse your files
  2. Select compression level based on your needs:
    • Low: Best quality, minimal compression
    • Medium: Balanced quality and size
    • High: Maximum compression, lower quality
  3. Click "Compress PDF" button
  4. View compression results
    • Compare original vs compressed size
    • See percentage size reduction
  5. Download compressed PDF using the download button

Understanding PDF Compression

Images
Main compression target
Text
Already optimized
Structure
Streamlined
  • Image compression: Reduces image quality to shrink file size
  • Content optimization: Removes unused elements and metadata
  • Quality vs Size: Higher compression = smaller files but lower quality

Compression Level Guide

Level
Quality Loss
Size Reduction
Best For
Low
Minimal
20-40%
Important documents, presentations
Medium
Moderate
40-60%
General documents, reports
High
Significant
60-80%
Text-heavy docs, archives

Tips for Best Results

  • Image-heavy PDFs: Use medium or high compression for significant size reduction
  • Text documents: High compression works well with minimal quality loss
  • Scanned documents: Start with low compression to preserve OCR accuracy
  • Multiple compressions: Avoid compressing already compressed PDFs

Important Limitations

  • Size limit: Maximum 50MB PDF files supported
  • Quality loss: All compression methods reduce image quality
  • Irreversible: Compressed PDFs cannot be restored to original quality
  • Processing time: Large files may take several seconds to compress

Frequently Asked Questions

Size reduction depends on the PDF content and compression level. Image-heavy PDFs can be reduced by 60-80% with high compression, while text-only PDFs might only reduce by 10-20%. The actual reduction varies based on the original file's content and quality.

Text quality is generally preserved during compression since text is already highly optimized in PDFs. The main quality loss occurs with images. However, if your PDF contains scanned text that needs OCR processing, higher compression levels might affect OCR accuracy.

PDF compression is performed server-side for technical reasons (client-side PDF processing is limited). Your files are processed temporarily and not stored on our servers. However, for maximum security with sensitive documents, consider using offline PDF compression tools.

Large PDF files with many pages and high-resolution images require more processing time. The compression algorithm needs to analyze and optimize each image individually. Files over 10MB may take 10-30 seconds to process, depending on the compression level and server load.