How no-upload works

SakuConvert never sends your video to a server. Here is why that is possible, and how you can check it yourself.

Your video is handled inside the browser

Modern browsers can read and write video on their own (a feature called WebCodecs). That means a web page can use the same video hardware your computer or phone already has.

SakuConvert uses it. When you choose a video, the browser reads the file, compresses it on your device, and saves it on your device. Nothing is sent anywhere.

How to check it yourself

1. Leave this page open and turn on airplane mode (or unplug the network).
2. Choose a video and compress it.
3. It still works.

If it works with no connection, nothing is being sent.

If you know your way around browser developer tools, open the network panel while you compress a video. You will not see any request carrying your video.

Why it matters

• Work, school, and family videos never leave your device.
• No waiting for a long upload, even for big files.
• No free-plan size caps.

Speed depends on your device

• Computers finish faster than phones.
• Older devices cannot open some formats. We tell you before anything starts.
• Saving works a little differently per browser. Chrome and Edge let you pick the destination first, so even very large files are fine.