Compress PDF Files

Reduce PDF file size while maintaining quality — powered by client-side processing. Your files never leave your device.

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How to Use This Tool

  1. 1Upload your PDF file — the tool automatically detects the file size.
  2. 2Choose a compression level: Extreme (smallest file), Recommended (balanced), or Less (highest quality).
  3. 3Click "Compress PDF" and watch the real-time processing log.
  4. 4Compare the original and compressed sizes, then download your smaller PDF.
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Frequently Asked Questions

How much can I reduce my PDF size?▼
Typical results range from 40-80% reduction depending on the content. PDFs with large images compress the most, while text-heavy PDFs see smaller improvements.
Does compression affect text quality?▼
Text remains sharp at all compression levels. The compression primarily affects embedded images, which are re-encoded at your chosen quality level.
What's the maximum file size I can compress?▼
We recommend files under 100 MB for the best experience. Larger files will work but may take longer and use more browser memory.

Why Compress PDFs with PDFBuilt?

Email attachment limits, slow uploads, and bloated storage costs make PDF compression essential for modern workflows. PDFBuilt's compression engine renders each page and re-encodes images at your chosen quality level — all within your browser. Unlike server-based tools that process your files in unknown data centers, PDFBuilt ensures your annual reports, medical records, and legal filings never leave your device. The three-tier compression system lets you choose the perfect balance between file size and visual quality.

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