PDF Compressor
Reduce heavy PDF file sizes for email sharing, portal submissions, and faster web downloads. Choose preset compression strengths or fine-tune custom DPI and quality parameters.
How PDF Compression Works Inside Your Browser
Raster Stream Optimization
Large scanned documents often embed uncompressed raw TIFF or bitmap streams. Our engine re-encodes image streams using efficient DCT/JPEG compression algorithms.
Adaptive Downscaling
Many phone cameras and scanners produce 300 to 600 DPI images far exceeding screen needs. Downscaling to 108–144 DPI slashes file size while keeping visual clarity.
Zero Server Exposure
Unlike cloud compression websites that upload and store your files on their servers, our solution executes 100% inside your browser's private memory.
Frequently Asked Questions
PDFs that contain primarily raw vector text and no embedded images are already minimal in byte size. The greatest compression gains (60–80%) occur on scanned documents, reports with photos, presentation slides, and portfolio booklets.
Yes. The 'Recommended' profile uses high-fidelity bicubic resampling and 72% JPEG quality, ensuring text characters and line diagrams remain crisp and easy to read on desktop and mobile displays.
There are no arbitrary limits. The engine processes pages sequentially in memory. For 50+ page documents, compression may take a few seconds longer depending on your computer's CPU speed.