Dual Subtitles for YouTube ("the extension") is designed to need as little of your data as possible. In short: it collects nothing, sends nothing to us, and has no servers, accounts, tracking, or analytics.
What the extension does
The extension runs only on YouTube watch pages. There it:
- reads the caption (subtitle) data the page already provides, entirely on your device, to render two subtitle lines over the video;
- writes text to your clipboard only when you click a copy control or press copy — and it never reads from your clipboard;
- saves your own settings (chosen languages, line colours, font size, display mode, on/off) so they persist and follow your Chrome profile.
Data we collect
None. The extension has no backend. It does not collect, transmit, sell, or share any personal information, browsing history, or the content of the videos you watch. Caption text is processed locally and is never sent anywhere by us.
Data the extension stores
Only your settings, via Chrome's storage.sync API. This data contains just your preferences (language codes, colours, font size, display mode, enabled flag) — no personal or identifying information. It is stored by Chrome and synced through your own Google account if you have Chrome Sync enabled, handled by Google's infrastructure under Google's privacy policy, and is not accessible to the extension's developer. You can clear it at any time by removing the extension or clearing its storage in chrome://extensions.
Permissions and why they're needed
- storage — to save and restore your settings.
- clipboardWrite — to copy the subtitle text you select to your clipboard, only on your explicit action.
- Host access to https://www.youtube.com/* — so the extension can run on YouTube watch pages and read the page's existing caption data. It runs on no other website.
Children's privacy
The extension collects no data from anyone, including children.
Changes
If this policy changes, the updated version will be published at this page with a new "Last updated" date.
Contact
Questions or requests: email dualsubs.support@gmail.com.
Dual Subtitles for YouTube is an independent, third-party extension. It is not affiliated with, sponsored, or endorsed by YouTube or Google LLC. "YouTube" is a trademark of Google LLC.