About this tool
This browser-only optimizer loads the PDF and writes a fresh document using compressed object streams. It preserves page content and existing embedded image quality; it does not rasterize pages or downsample images.
How to use Compress PDF
- Choose the supported file or files from your device.
- Review the available settings and start processing.
- Check the result, then download or share it when supported.
Privacy
Processing runs in this browser. Your input and generated output are not uploaded to Zealous Tools.
Common uses
- Complete compress pdf tasks on a phone or desktop.
- Prepare a result without creating an account or transferring private input.
Limitations
- Structural optimization may produce a smaller file, but image-heavy or already optimized PDFs may change little or can become slightly larger.
- Aggressive image downsampling is intentionally excluded because page rasterization can remove searchable text, links, forms and accessibility information.
Questions
Is my input uploaded?
No. Supported processing happens in your browser and the input is not sent to the analytics service.
Can I use this on a phone?
Yes. The interface is designed for current mobile browsers, subject to device memory and browser feature support.