Compress PDF File Size Online on Windows
Instantly compress PDF files to COMPRESSED format locally in your browser. 100% private, no uploads.
How to Use this Tool
Drag and drop your oversized PDF file into the drop container.
Allow the PDF optimizer to downsample heavy graphics and strip metadata.
Save your compact PDF directly to your device.
100% Private, Client-Side Processing
Unlike other conversion portals, Drafto performs all calculations locally on your computer's browser engine using high-performance WebAssembly and JavaScript APIs. This means your files never leave your device. There is no background upload stream, making this converter completely compliant with strict workspace privacy rules, HIPAA standards, and corporate data security policies.
Optimized on Windows
For Windows users, our browser-based tool allows instant conversions without the need to buy proprietary Microsoft Store extensions, download external executable installers, or set up complex command-line scripts. Because the processing utilizes standard web components, it matches native operating system capabilities without hogging CPU resources.
About the PDF Compressor utility
This tool is part of Drafto's local productivity collection. It is built to resolve day-to-day conversion bottlenecks, file format mismatches, and size limitations quickly, securely, and completely free of charge.
Frequently Asked Questions
No. Drafto is an online, browser-based web application. It runs locally inside your browser, meaning it is compatible with all devices running on Windows without any installations.
No. The formatting, vector coordinates, fonts, and text lines remain untouched. Only large embedded raster images are optimized to reduce size.
No. Drafto is completely free. There are no hourly or daily conversion limits, no file size caps, and no registration forms to complete.