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Home/Converters/PDF Compressor
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PDF Compressor

Compress PDF files to reduce file size online for free. Choose your compression level and download a smaller PDF instantly.

Drag & drop or click to upload a PDFPDF files only

How it works

  1. Upload a PDF file by clicking or dragging it in.
  2. Choose your compression level: high quality, balanced, or maximum compression.
  3. The tool re-renders each page as an optimized JPEG image and rebuilds the PDF.
  4. Download your compressed PDF instantly. All processing happens in your browser.

About PDF Compressor

Free online PDF compressor that reduces PDF file size directly in your browser. Upload any PDF and choose from three compression levels: High Quality (minimal compression, best visuals), Balanced (good quality at smaller size), or Maximum Compression (smallest file size). The tool works by re-rendering each page as an optimized JPEG image and rebuilding the PDF, giving you significant file size reductions. See a visual comparison of original vs compressed size with exact savings percentage. Try different compression levels instantly without re-uploading. All processing happens client-side using pdfjs-dist and pdf-lib - your files never leave your device, making this tool completely private and secure. Perfect for emailing large PDFs, uploading to portals with file size limits, or archiving documents. No signup, no watermarks, no limits.

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Frequently Asked Questions

How does PDF compression work?
The tool re-renders each page of your PDF as an optimized JPEG image at your chosen quality level, then rebuilds a new PDF from those images. This removes embedded fonts, metadata, and unnecessary data while preserving the visual content of each page.
Will compression affect the quality?
It depends on the compression level you choose. High Quality mode preserves most visual detail with minimal compression. Balanced mode offers a good tradeoff. Maximum Compression reduces file size the most but with lower image quality. You can try all three levels and compare before downloading.
Can I compress a PDF with selectable text?
Yes, but note that the compressed PDF will contain images of each page rather than selectable text. If you need to preserve selectable text, use the High Quality setting for the best visual fidelity.
Are my files uploaded to a server?
No. All compression happens entirely in your browser using JavaScript (pdfjs-dist and pdf-lib). Your PDF files never leave your device, making this tool completely private and safe for confidential documents.
Is there a file size limit?
There is no hard limit. Since processing happens in your browser, the practical limit depends on your device's memory and processing power. Most devices can handle PDFs up to 50-100 MB without issues.
Is this tool free?
Yes, completely free with no signup required. No watermarks, no limits, no hidden fees.

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