Your browser downloads the tool's program code and processes files using your device's CPU. Files are never sent to any server.

What are the benefits of client-side processing?

Free and unlimited usage, privacy protection (files never leave your device), and fast processing with no upload waiting time.

Frequently Asked Questions (FAQ)

Q: Are these tools safe? Are my files collected?

All tools on this site are completely safe. We never collect, store, or transmit any files you upload. All processing happens entirely in your browser.

Are these tools safe? Are my files collected?

All tools on this site are completely safe. We never collect, store, or transmit any files you upload — including images, audio, video, or PDFs. All processing happens entirely in your browser.

This is the core differentiator of FreeTool.jp compared to traditional tools that upload files to a server for processing.

How does it work?

When you access the site

Your browser downloads the tool's program code (HTML, CSS, JavaScript, WebAssembly) from our server. At this point, only the "blueprint" of the tool is delivered — no file processing has occurred.

When you process a file (e.g., video conversion)

You drag and drop your file into the tool.
The file is never sent to any server.
The program running in your browser uses your device's CPU to process the file.
The output file is generated locally and downloaded directly to your device.

In other words, this site simply "lends you the tools for free" — the actual processing happens on your own device.

A "Tool Lending Library" Concept

This site is not an "app vending machine" — it works more like a "tool lending library."

The server (lending library): It simply stores the tools (programs). When you visit, it hands them over for you to use (downloaded to your browser).
Your device (workshop): You load the program into your browser and do all the work on your own device. All file processing happens here — nothing is ever sent to the server.

Benefits of Client-Side Processing

Free & unlimited: No heavy server-side computation means low hosting costs, allowing us to provide all tools for free.
Privacy by design: Your confidential documents, private photos, and sensitive videos never leave your device.
Fast & responsive: No upload waiting time — even large files can be processed instantly on your hardware.

About Server Load

The server only delivers the program files (HTML, CSS, JavaScript, etc.) at the initial load. Even if tens of thousands of users are editing heavy videos simultaneously, the server load does not increase. This makes it easy to operate even on affordable hosting plans.