Guide
How to edit files without uploading them
Why browser-only tools keep your files private, how to check that a tool really works offline, and when to use one.
Updated 14 November 2026
Many free online tools upload your file to a server, process it there and send back the result. That is fine for a holiday photo, but not for a passport scan, a contract or a medical letter. Tools that run in your browser avoid the upload completely.
How browser-only tools work
Modern browsers can run demanding programs directly on your device. A browser-only tool downloads its code once, then works on your file inside the browser tab. The file never leaves your computer or phone, and nothing is stored on a server. Every tool on PiSpace Tools works this way.
How to check a tool yourself
- Open the tool and wait for it to load completely.
- Turn off your internet connection, or switch on flight mode.
- Use the tool. If it still works, your file was not sent anywhere.
You can also open your browser's developer tools, choose the Network tab and watch for uploads while you use the tool.
When to use one
- Combining, splitting or compressing PDFs with personal details.
- Removing location data from photos before you share them.
- Resizing scans of identity documents for an online form.
- Converting audio or video you do not want to publish.
Limits
Large videos can be slow on older phones, because your device does the work instead of a server. If a file is very large, use a computer, and close other tabs to free memory.
Sites used in this guide
- PiSpace Tools: Everyday tools that run in your browser.