Compress PDF
Reduce PDF file size online. Re-compress embedded images to shrink your PDF - 100% free, private, no upload needed.
Bookmark This Tool
Press Ctrl + D (or ⌘ + D on Mac) to save this tool for instant access!
How to Compress PDF Files
Upload Your PDF
Drag and drop your PDF file into the upload zone, or click to browse. The tool immediately analyses your file and shows the current size and page count.
Choose Compression Level
Select Low (best quality), Balanced (recommended), or High (maximum compression). The Balanced preset works great for most documents including scanned PDFs and reports.
Compress in Your Browser
Click "Compress PDF". The tool re-processes embedded images using your browser's native Canvas API - everything runs locally with zero file uploads.
Download Compressed PDF
View the before and after file sizes, the percentage reduction, and download your compressed PDF instantly - no waiting, no ads, no watermarks.
Frequently Asked Questions
Our tool re-processes the PDF's embedded images at a lower quality setting using the HTML5 Canvas API and pdf-lib. This significantly reduces file size for PDFs that contain photos, scanned documents, or high-resolution graphics. All processing happens in your browser - no files are uploaded.
Compression results vary based on content. PDFs with many high-resolution images can be reduced by 50-80%. PDFs with mostly text and vector graphics see smaller reductions (5-20%). The tool shows you the exact before and after sizes.
Yes, completely safe. Your files never leave your device. All compression happens locally in your web browser using JavaScript. No data is sent to any server.
The 'High Compression' mode reduces image quality slightly to achieve maximum size reduction. The 'Balanced' mode provides a good middle ground. The 'Low Compression' mode makes minimal changes and preserves the most quality. Choose the mode that best fits your needs.