100% Free, Private, In-Browser Tool
No uploads. No accounts. No limits. Your files never leave your device.
Compress PDF Documents
Reduce PDF file sizes by compressing embedded images locally. Fast, secure, and offline-ready.
All compression runs locally inside your browser.. Max file size is 100MB.
Drag & drop a PDF file here, or click to browse
All compression runs locally inside your browser.
Max file size: 100MB
Compression Options
Recommended Settings: Perfectly balances file size reduction and image clarity. Images will be scaled to 80% with 70% quality. This is the optimal setting for most PDFs.
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Frequently Asked Questions
Everything you need to know about processing files securely in your browser
How does this offline PDF compressor reduce file size?
Our PDF compressor runs completely in your web browser. It analyzes the PDF, downscales embedded high-resolution images, and applies optimal JPEG compression to them. Because all calculations occur locally on your device, the file size is reduced without any data being uploaded to the internet.
Will compressing a PDF file affect the text quality?
No. The compression engine specifically targets and optimizes embedded images and raster graphics. All text, vector paths, shapes, and structural elements of the PDF are preserved at their original resolution and quality.
Is there a file size limit for compressing PDFs here?
There are no artificial file size limits or restrictions. The tool processes files locally using your browser's memory, so the maximum size depends on your computer's RAM and processing power. We recommend files under 100MB for the smoothest experience.
Can I customize the image quality and resolution scaling?
Yes. You can choose from our balanced presets (Recommended, Max Space, High Quality) or toggle the custom sliders to manually adjust the JPEG quality percentage and image scale factor to meet your exact size and quality needs.