100% In-Browser Privacy • Zero Cloud Uploads
Compress PDF Online
Reduce PDF document size for email attachments and application portals while preserving crystal-clear readability.
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Drag & drop a PDF to compress
or click to browse from your device
100% In-Browser Privacy
All image downsampling and stream compression execute 100% inside your browser memory. Your documents are never uploaded to any remote server.
How to Compress PDF Files Online
1
Upload Document
Select or drop your large PDF file into the upload box.
2
Choose Preset
Select Recommended, High Compression, or Low Compression.
3
Download Shrunken PDF
Download your optimized PDF file with instant percentage savings calculation.
Frequently Asked Questions
The tool renders each page on an HTML5 canvas, downsamples excessive DPI resolution (e.g. from 600 DPI to 150 DPI), quantizes raster photos with JPEG compression, and rebuilds an optimized PDF structure.
Never. All compression calculations happen 100% locally in your browser RAM. Your confidential bank forms, tax returns, and contracts never touch the cloud.
For email attachments and job portals, 'Recommended (150 DPI)' provides the best balance of dramatic file size reduction and crisp readability.