How browser-based file processing works

A browser can process files on your device without uploading those files to a processing server. That is different from saying a website makes no network requests at all.

Opening a local file

When you choose a file in a supported FreeToolzHub tool, browser code reads it into the current tab. PDF and image operations use JavaScript libraries or native browser features to create a result. The download is generated from that result on your device.

What still uses the network

The hosting service receives requests for pages and code. OCR tools can download their engine, workers, and language-model files. An external link opens another service when you choose to follow it. These connections are distinct from uploading your selected document.

Local storage is not a server upload

Some trackers and planners may save entries in your browser’s local storage. Those entries can remain after you close the tab and may be visible to another person using the same browser profile. Clear saved data when using a shared device.

Practical precautions

• Use an up-to-date browser and extensions you trust.
• Keep original documents until you have checked the result.
• Avoid handling confidential files on a shared or compromised device.
• Read a tool’s limitations before relying on its output.

See the privacy policy for the practices described for this edition.