Are Online Video Converters Safe? How to Tell Upload Sites From Local Ones
Searching for a video converter turns up dozens of websites. They look similar, but they can work in two very different ways. Understanding the difference helps you decide how much to trust a site with a private video.
Two kinds of online converters
1. Upload-based converters
Most older converter sites work like this: you pick a file, the website uploads it to its own server, the server converts it, and you download the result. This has real consequences:
- Your video, which may contain family footage, a work meeting or private information, is copied to a computer you do not control.
- You depend on the site's promise about when files are deleted.
- Large files take time to upload and download, and sites often impose size limits or require payment above them.
2. Local, in-browser converters
Newer tools, including Free Video Converter, run the conversion on your own computer. The website sends your browser a conversion engine (here, FFmpeg compiled to WebAssembly), and your browser does the work. The video is read from your disk and the result is created in your browser's memory. Nothing is uploaded.
The trade-offs are speed (your computer does the work, in a browser, which is slower than a native app) and memory (very large files may not fit).
How to check whether a site uploads your file
Do not just trust a claim on a webpage, including ours. You can verify it yourself with your browser's developer tools:
- Open the converter page, then press F12 (or right-click and choose Inspect) and open the Network tab.
- Add a video and start the conversion.
- Watch the list of requests. An upload-based site shows a large outgoing request (a "POST" or "PUT" carrying roughly the size of your file) to a server. A local converter shows no such request. With Free Video Converter, the only large download is the conversion engine itself, and it happens before your video is processed.
Another quick test: convert one small file first, so the engine has finished loading, then switch off your internet connection and convert a second small file. A local tool should keep working because everything it needs is already in your browser; an upload-based site cannot work offline.
Other things to watch for on any converter site
- Fake download buttons. Some sites surround the real button with ads that look like buttons. If a "Download" button sends you to another page or starts downloading an installer, back out.
- Required installers or extensions. A browser-based converter should not need you to install anything. Be careful with "download manager" or "converter app" offers.
- Missing privacy policy and contact information. Reputable sites explain what they collect and how to reach them.
- Unusual permissions. A converter has no reason to ask for notifications, location or camera access.
What Free Video Converter does and does not know about you
Because conversion is local, we never receive your videos. Like any website, our hosting provider keeps ordinary server logs of requests to the site (such as IP address and the pages requested). Our privacy policy describes this in plain language, including how advertising cookies may be used once ads are shown.
No tool can make illegal or protected material legal to copy. We only convert files you already have, and do not download videos from other sites.
Ready to try it? Convert your video in the browser, no upload and no sign-up.
Open the converter