Compress and reduce PDF file size online directly in your browser. Optimize documents for email and web sharing while maintaining complete file privacy.
Privacy & Technical Specifications
100% In-Browser: Your files never leave your device and are never uploaded to any server.
Browser Sandboxing: Built on modern MDN Web APIs with zero server-side storage.
Maximum File Size: 100 MB per file
Supported Formats: application/pdf
Standards Compliance: Processed in accordance with ISO 32000-2 (PDF 2.0) document architecture standards.
Cost: Free and unlimited without accounts
How to Use Compress PDF
Click or drag and drop a PDF file into the upload area.
Leave the compression level on "Recommended — Lossless".
Click "Compress PDF".
If the file can be optimized, download your new smaller PDF.
Frequently Asked Questions
Is my data secure?
Yes! All processing happens completely locally in your browser. Your PDF files are never uploaded to our servers, ensuring total privacy.
Will this make my text unselectable?
It depends on the compression level. Lower levels (10% - 30%) preserve text, fonts, and vector graphics perfectly. Higher levels (50% - 90%) may rasterize pages into images to achieve smaller file sizes, which can make text non-selectable.
Why didn't my file size shrink?
If your PDF is already highly optimized or consists entirely of compressed images, it may not be possible to reduce its size further without ruining the quality. We never fake a compression — if we can't reduce the size, we preserve the original file.
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