Secure & Free PDF Compression Tool

100% FREE. No login. No server uploads.
Proactively disconnect to test; it still works smoothly offline.

Drag and drop PDFs here, or select files

Supports PDF files only

Frequently Asked Questions

Is KYOJOY PDF safe? How is my privacy protected?

Very safe! KYOJOY PDF runs entirely in your browser; files are not uploaded to any server. This means:

  • Sensitive documents never leave your device
  • No data leakage or third-party access risk
  • Works even without internet

Temporary links are automatically removed shortly after processing for extra privacy.

Is KYOJOY PDF free? Any limitations?

KYOJOY PDF is 100% free, with no hidden fees or subscriptions—we make PDF compression easy for everyone. Our revenue comes solely from on-page ads, If you see ads while using it, they help fund the free service. As a browser-based tool, its performance may depend on your device and browser, but we keep optimizing for a smoother experience.

How does compression affect PDF quality?

PDF compression reduces file size by optimizing images, fonts and other elements. We offer two levels:

  • High Quality: Almost no impact on quality, ideal for high-quality documents
  • High Compression: Maximizes size reduction, with slight quality loss but usually not affecting readability

Choose the level that fits your needs and check results with our comparison info.

What file sizes are supported?

In theory, any size; real capability depends on your device and browser:

  • Small PDFs (few MB): very fast, almost no delay
  • Medium PDFs (tens of MB): slightly longer processing time
  • Large PDFs (hundreds of MB+): may take longer; use a powerful device

For very large files, consider splitting into batches for best experience.