Last updated: October 16, 2026


EarDub ("we", "us") is a browser extension for Chrome, Edge and Firefox, operated by Zhang Qianfeng, that translates videos — on YouTube, online course sites and other pages you choose — into AI voice dubbing in your language. This policy explains what data the extension and our backend handle. Dubbing requires a free account; aside from what is needed to run the service and your account, we collect as little data as possible.


Account and usage data: dubbing requires a free account. Through our authentication provider, Supabase, we store your email address and an identifier for the sign-in method you chose (Google, Microsoft or email) to identify your account, and we record how many minutes you have dubbed on each video to enforce your plan's quota.
Caption text of videos you dub: when you click the dub button, the video's caption text and basic metadata (video ID, title, language) are sent to our servers so we can translate it and generate audio. We never see videos you merely watch without dubbing. When you dub a video on a site other than YouTube, Udemy or Coursera, we also record that site's name (for example ted.com) to learn which sites people use.
Audio of videos you dub that have no captions: on any site, when a video you choose to dub has no captions, the extension sends that video's audio, in short pieces while it plays, to our servers to be turned into text by speech recognition. We use the recognized text like captions and do not store the audio. Nothing is recorded or sent for videos you do not dub.
Settings: your language, voice, and volume preferences are stored in Chrome's extension storage and synced by Chrome if you enabled browser sync.
Feedback: if you submit feedback on our website, we receive your message and the email address you optionally provide.
Payment: paid subscriptions are processed by our Merchant of Record, Waffo Pancake (subscriptions started earlier may be handled by Creem). The Merchant of Record handles your payment; we store only a customer and subscription identifier, your plan, and its status, and never receive or store your full card details. We never receive your passwords or search queries.
Location: to apply the right taxes and prices for where you are, we read your browser's time zone and, if that doesn't tell us, look up the country of your IP address in a database on our own server (IP geolocation by DB-IP, https://db-ip.com, CC BY 4.0). Neither is sent to a third party. At your first checkout we keep that country on your account.
Usage events: to run and improve the service, we record which sites EarDub is used on (the site's name, such as youtube.com), the title and address of the videos you dub, with access tokens and query strings removed from the address, and events from EarDub's own buttons and menus (for example, a dub started or an upgrade prompt shown). These are tied to a random identifier stored in the extension and, when you are signed in, to your account. EarDub doesn't look at the other pages you visit. On your first visit to our website we also note where you came from (the referring site and any campaign tags in the link) and the first page you opened; if you then install the extension, this is linked to your account so we can see which channels bring users.
Content moderation: when a dub request or a translated line matches our content screening, we log the video ID, your account ID, the matched terms and the action taken, as described in our Acceptable Use Policy. Moderation logs are kept as long as needed to enforce our policies and meet legal obligations.


To provide the dubbing service (recognize speech in videos without captions, translate captions and synthesize speech), to manage your account and subscription, to enforce your monthly plan quota, to debug problems and prevent abuse, and to improve translation and audio quality. We do not sell your data, show ads, or track you across websites.


To run the service we send the minimum necessary data to: Google and Microsoft (sign-in, when you choose them), Supabase (your account, dubbing job records and usage counts; database and authentication hosting), Waffo Pancake and Creem (your email and payment details, to process subscriptions as Merchant of Record), third-party AI language model providers (caption text, for translation), third-party speech recognition providers (audio of videos without captions, for speech-to-text), third-party text-to-speech providers (translated text, for speech synthesis), Cloudflare (generated audio files, for storage and delivery), Vultr (API server hosting) and Vercel (website hosting). Each provider receives only what is required for its function.


Audio sent for speech recognition is processed to produce text and is not stored by us.
Generated audio, translations and dubbing job records are cached so repeat requests for the same video are instant, and may be periodically cleaned up. Cached dubs are tied to the video, not to you.
Your account, usage counts and usage events are kept while your account exists. To delete your account, your usage history and usage events, email us at support@eardub.com from the address you sign in with; we delete them within 30 days.


storage: saves your settings. youtube.com access: reads caption data, or the audio of a video you dub that has no captions, and overlays the dubbing player on the page. udemy.com, udemycdn.com and coursera.org access (optional, requested only when you choose to dub on those sites): reads lecture captions, or the audio of a lecture you dub that has no captions, and overlays the dubbing player. x.com, bilibili.com and gumroad.com access (optional, requested only when you allow the site in the EarDub menu): reads the captions of a video you dub, or its audio if it has no captions, and overlays the dubbing player. activeTab and scripting: when you choose to dub a video on any other site from the EarDub menu, EarDub runs on that tab only, to read the video's captions, or its audio if it has no captions, and play the dub; scripting also runs EarDub on the optional sites you allow. api.eardub.com access: sends captions, or the audio of videos without captions, to our backend and receives audio from it. The extension runs on no other site.


EarDub is not directed at children under 13, and we do not knowingly collect personal information from them.


We will post any changes on this page and update the date above. Significant changes will be highlighted on our website.


Questions about privacy: support@eardub.com.

Full policy: https://www.eardub.com/privacy