Compress PDF – Reduce File Size Online

Reduce PDF file size while maintaining quality. Perfect for email attachments and file sharing.

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Drag & drop a PDF file here or click to browse

Max file size: 100MB

How to Compress a PDF File

  1. Upload PDF: Drag and drop your PDF file or click to browse.
  2. Choose Level: Select Low (best quality), Medium (balanced), or High (smallest size).
  3. Compress: Click "Compress PDF" to process your file.
  4. Download: Save your compressed PDF with reduced file size.

Compression Levels Explained

  • Low Compression: Reduces file size by ~20-30% while maintaining excellent image quality. Best for documents with important graphics.
  • Medium Compression: Reduces file size by ~40-60% with good visual quality. Recommended for most documents.
  • High Compression: Reduces file size by ~70-90%. Some image quality loss may be visible. Best for archiving or when file size is critical.

Why Compress PDFs?

  • Meet email attachment size limits (typically 25MB)
  • Faster file uploads and downloads
  • Save storage space on your device
  • Improve website loading when hosting PDFs online
  • Make file sharing via messaging apps easier

Limitations

  • PDFs with mostly text won't compress significantly (text is already efficient)
  • Already compressed PDFs may not reduce much further
  • High compression may affect image quality
  • Processing large files may be slow on older devices

Frequently Asked Questions

PDF compression reduces file size by optimizing images, removing duplicate data, and streamlining internal structures. Our tool uses image quality reduction as the primary method for client-side compression.

The impact depends on your chosen compression level. Low compression maintains near-original quality, while high compression may show slight image degradation but produces much smaller files.

No. All compression happens directly in your browser using JavaScript. Your file never leaves your device.

PDFs that are mostly text or already optimized may not compress significantly. The best compression results come from PDFs with large, uncompressed images.