PDF Compressor
Reduce PDF file size by re-rendering pages at a lower resolution and JPEG quality. Free, unlimited, 100% client-side.
Drag & drop files here
or
Choose filesProcessed on your device. Nothing is uploaded
How to use PDF Compressor
- 01Add your files
Click “Choose Files” or drag and drop them onto the page. Batch conversion is supported.
- 02Adjust settings
Pick quality, size or other options. Sensible defaults are pre-selected.
- 03Convert & download
Hit Convert and download your files. Everything runs locally. Nothing is uploaded.
Frequently asked questions
How does PDF Compressor work?
Drop your file, pick a quality target and hit Compress. The optimized file downloads straight from your browser. Nothing is uploaded.
Is PDF Compressor free?
Yes, completely free with no watermarks or limits, because all processing runs on your own device.
Are my files safe?
Your files never leave your device. Compression happens locally in your browser via WebAssembly.
Is there a file size limit?
We impose no fixed limit. The practical ceiling is your device's free memory, since processing happens locally. Most conversions work comfortably with files up to a few hundred megabytes, and image or document conversions handle much more.
Does it work on my phone?
Yes. The converter runs in any modern browser on Windows, macOS, Linux, Android and iOS. No app installation is required.