PlainsumVideo

Your videos stay in this tab.

Home videos, screen recordings and work footage are personal. Here is exactly what this site does with one, and how you can check without taking our word for it.

What happens to your video

You choose a file. Your browser lets the page read it in slices from your disk. The decoding, resizing and encoding are done by the video decoder and encoder built into your browser (WebCodecs), driven by the open-source mediabunny library, which is bundled with the site and not loaded from anywhere else. The new MP4 is assembled in memory and handed to you as a download. At no point is the file or any part of it sent to a server, because the page is not able to send anything.

Why it cannot send anything

Every tool and content page carries a Content-Security-Policy that includes connect-src 'none' and a default of 'none' for everything else. The single exception is the activation page, which holds no videos and may connect only to our license server. Your browser enforces the policy: fetch, XMLHttpRequest, WebSocket, beacons and form posts to other sites are refused. Scripts and styles may only load from this site itself. There is no analytics script, no advertising tag, no font or script from a CDN, and no error-reporting service.

How to check it yourself

  1. Open a tool page in your browser and open developer tools (F12, or Option+Command+I on a Mac).
  2. Go to the Network tab and clear it.
  3. Add a video, compress it and download the result.
  4. The list stays empty. You will see no requests at all while you work.
  5. For a harder test, turn on airplane mode after the page has loaded and do it again. It works.
  6. Or open the Console and run fetch('https://example.com'). The browser refuses it and names the policy that blocked it.

What is stored in your browser

These live in your browser's local storage on this site, and clearing site data removes them. The license key leaves your browser only when you press a button on the activation page or open it with a license more than a month old: it is sent to our license server (and on to Creem) to confirm that it is valid. Nothing else is sent. Your videos and the compressed results are held in memory only and disappear when you close or reload the tab, unless you downloaded the result.

What the host can see

The site is served as static files. Whoever hosts it can see ordinary web-server information when you load a page, such as your IP address and which page you requested, the same as for any website. That happens when the page loads, before you add a file, and it does not include your files. Pro checkout happens on Creem's own site after you click the Buy button, and is governed by Creem's privacy policy; the tool never sees payment details.

Limits of this promise

This protects the file from leaving the page. It cannot protect you from a compromised computer, a malicious browser extension that can read pages you open, or a copy of this site that someone else has altered. Use the real address and process sensitive footage on a device you trust.

Questions: contact@getplainsum.com

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Plainsum Video Pro

Pro is a one-time $19. It takes input files of any size (free stops at 500 MB), compresses a queue of files one after another, asks the browser for the hardware video encoder first, and remembers your settings.

Buy Pro, $19I have a license key

After you pay, Creem emails you a license key. You paste it on the activation page, which is the only page that talks to a server. Compressing a video never does.