User Guide & FAQ
Simple steps to compress your PDF files safely and locally. Below is the complete usage guide and common questions.
How to Use (3 Simple Steps)
- Select Compression Mode: Choose Light, Balanced, or Extreme compression according to your needs.
- Upload PDF Files: Click the upload area or drag PDF files into the page. Multiple files are supported.
- Download Results: After automatic compression, download single files or batch download all files via ZIP package.
Frequently Asked Questions
1. Are my files uploaded to the server?
No. All compression calculations are completed inside your local browser. Your files will never be uploaded, transmitted, or stored on any remote server.
2. Will the compressed PDF lose quality?
Different modes have different balance strategies. Light mode retains almost all original quality. Balanced mode balances size and clarity. Extreme mode pursues the smallest volume with acceptable clarity.
3. How many files can I process at one time?
Free version supports limited batch processing. Pro version unlocks unlimited batch quantity and faster processing speed.
4. Is this tool free to use?
Basic local PDF compression functions are permanently free. Advanced unlimited batch, ultra compression and enterprise adaptation belong to Pro membership privileges.
5. Does the tool collect my personal data?
We do not collect file content, do not record user behavior, and do not track personal information. Only necessary local cookies are used to maintain basic page functions.
Frequently Asked Questions
Is PrivacyPDF really free?
Yes. The core compression tool is and will remain free. There is no account required, no daily limit, and no hidden cost. A Pro tier with advanced features is planned, but the free version will always support unlimited single-file compression.
Are my files uploaded to a server?
No. PrivacyPDF runs entirely in your browser. When you select a file, it is read from your local disk using the browser File API and processed with JavaScript. The PDF data never leaves your device. You can verify this by disconnecting from the internet after the page loads β compression still works.
Which compression mode should I use?
Start with Balanced mode for most documents. If the result is still too large for your needs, try Extreme. If the compressed PDF looks blurry or pixelated, switch to Light. The preview feature lets you compare before and after before downloading.
Does compression reduce text quality?
No. PrivacyPDF only compresses images and removes redundant data. Text, vectors, and fonts are preserved at full quality. Your documents will remain fully searchable and print-ready.
Can I compress multiple PDFs at once?
Yes. Select multiple files or drag a folder onto the upload area. Each PDF is compressed individually, and you can download them separately or as a single ZIP archive. Batch processing is also 100% local.
What browsers are supported?
PrivacyPDF works in all modern browsers: Chrome, Firefox, Safari, Edge, and Brave. For the best experience, use the latest version. Very large files (over 100MB) may require a desktop browser due to memory limits on mobile devices.