Look inside data files without uploading them.

Small tools that run in this browser tab. Open a file, get your answer, and the file never leaves your device. Free, no account.

Tools

Your file stays in this tab

Where your file goes when you open it, in one diagram

There is no upload step. The tools are code your browser runs, and the server never sees what you open.

The server sends this page and the tool’s code to your device. Your file is read inside this browser tab and is never sent to the server.

Check it yourself: open your browser’s developer tools, switch to the Network tab and open a file. No upload request appears.