Loading...
Upload a PDF and set your desired maximum file size. Free, secure, and works in your browser.
Drag and drop a PDF file here
or click to browse (max 100MB)
Our advanced PDF compressor uses multi-pass adaptive compression to achieve market-leading file size reduction. Set your exact target size and let the engine find the optimal balance between quality and file size.
The compressor first analyzes your PDF to identify all embedded images and their formats. It then estimates the optimal compression settings based on your target size and applies multi-pass adaptive compression. JPEG images are re-encoded at optimized quality levels, while PNG-like images are converted to efficient JPEG format. The engine also strips metadata, XMP data, embedded thumbnails, and optimizes the PDF structure. Progressive image downscaling is applied when needed for maximum compression.
All compression happens directly in your web browser using client-side JavaScript. Your files are never uploaded to our servers, ensuring complete privacy and security. No data is stored or transmitted.
How does the PDF compression work?
Our compressor uses multi-pass adaptive compression. It analyzes your PDF, optimizes embedded images, strips metadata, and removes unused objects to reach your target file size.
Can I set a specific target file size?
Yes! Enter your desired maximum file size in MB or KB, and the compressor will optimize the PDF to meet that target while preserving the best possible quality.
Will compression affect PDF text quality?
No. Text and vector graphics remain crisp. Only embedded images are re-compressed. The engine finds the optimal balance between image quality and file size.
What should I enter as the target size?
The largest file size you can accept — for example a 2 MB email limit or a 500 KB form upload limit. The compressor searches for the highest image quality that still fits under it. If it can’t get that small, it tells you the smallest size it reached.
Does PDF Compressor upload my files to a server?
No. All processing happens entirely in your browser. Your files never leave your device, ensuring complete privacy and security.
Why can’t my PDF reach the target size?
Only embedded photos and images can be shrunk. Text, fonts and vector drawings are kept exactly as they are, so a mostly-text PDF has little to compress. In that case the tool shows the smallest size it could reach; scanned documents usually compress much further because every page is an image.
Merge PDFs and images into one document instantly.
Rearrange, rotate, and delete PDF pages visually.
Split PDFs by page range or extract individual pages.
Fix corrupted or damaged PDF files right in your browser
Convert a color PDF to black and white, right in your browser.