DubBuddy: Live AI dubbing & video translator

Real-time AI dubbing for videos and streams in any tab, no subtitles needed. Or live captions. Your own Gemini™ key, no account.

DubBuddy dubs the video or live stream in your tab into your language in real time, a few seconds behind the speaker, with the original playing underneath. It listens to the sound, not to subtitles, so it works where there are none. Prefer to read? Transcript only shows the words in the side panel as live captions, also for viewers who are deaf or hard of hearing, with a translation under each line if you like. HOW IT WORKS It runs on your own Gemini™ API key: the tab's audio goes to Google, whose Gemini API answers with the new speech, or with the words. Click the extension's icon, check the "Translate to" choice and press Start; press Stop when you are done. No account, no subscription, and no server of ours in between. FEATURES • Into 78 languages, about 3 seconds behind the speaker. The original is lowered only while the new voice speaks; set the volume of each, or mute the new one. • Transcript only: what is said, as it is said, in the language spoken; set "Spoken in" (82 to choose from) or leave it on Auto-detect. Nothing is played. • What the new voice says appears under each original line, and the words stay after Stop, with Copy and Save (as text). History keeps each session on this device, by day, to search, read again or delete; it is on by default, with a switch in Settings. • Start with the shortcut (Alt+Shift+D, Option+Shift+D on a Mac), with "Dub this tab with DubBuddy" in the page's right-click menu, or with the toolbar icon once the side panel is open. The shortcut also stops it. • Four text sizes; the original lines can be hidden; light or dark, as your system is set. The panel is in English and 14 more, following your browser. • Silence is not sent, so a pause costs nothing. A session stops on its own after 20 minutes of sound with nothing coming back, and after 150 minutes in all. • The minutes sent so far, and the time used this month in Settings, with links to the price list, your balance and your monthly spend cap. WHERE IT WORKS Any tab with someone speaking: YouTube™ videos, Twitch™ streams, online courses and lectures, webinars and web meetings. In a meeting you hear the others dubbed; your own voice is left as it is. The browser's own pages can't be captured, and some protected (DRM) players give no sound. COST DubBuddy charges nothing. Google bills your key's project directly, by the minute of audio sent, at prices it sets and may change. It also offers a free tier, within limits, to a project without billing, and may then use the audio to improve its products (not in the EEA, Switzerland or the UK, where its paid-use data terms apply to all use). To give you an idea, at its paid-tier prices on 30 October 2026: about $2.21 an hour to dub, $0.55 to $0.70 an hour for a transcript, and $0.07 to $0.17 an hour more to translate it. The bill follows the time spent playing, so watching at 2× costs about half, and the new voice is still billed when muted. To limit the bill, use prepaid credit or a monthly spend cap in AI Studio; when either stops a session, the panel says which. PRIVACY The audio travels from your browser straight to the Gemini API over an encrypted connection, only while a session you started is running; in Transcript only, when you pick a target under "Translate to", the lines go there as text. The key is stored encrypted on this device and sent only there. No server of ours is involved. The extension runs no code in the pages you visit: the browser tells it the title and address of the page you start it on, and the title is kept only while the session runs. What is on screen is kept in memory only; History keeps each session's words on this device, never the sound or anything about the page. No analytics, no ads. Privacy policy: https://dubbuddy.com/privacy SET UP IN TWO MINUTES 1. Make an API key in AI Studio and turn on billing for its project. 2. Paste it on the welcome page that opens on install, or in the side panel. It is checked at once. 3. On the video's page, click the DubBuddy icon (in the Extensions menu, the puzzle piece, until you pin it) and press Start. Step-by-step guide, with how to cap the bill: https://dubbuddy.com/setup PERMISSIONS The install dialog says "Read and change all your data on all websites": that is how tabCapture, the permission to capture what a page plays, is worded. It captures only the page you start it on, never its picture, and only until you stop. The others: activeTab (only where you clicked the icon, pressed the shortcut or chose the right-click item), offscreen (a hidden document for the capture), sidePanel, contextMenus (the right-click item), storage and unlimitedStorage (what it keeps on this device, safe from eviction when the disk runs low), and generativelanguage.googleapis.com, the API's address. GOOD TO KNOW • The first words arrive about 5 seconds after Start. Names and terms can be misheard. • Speech already in the language you picked is left as it is: you hear the speaker. • Ads that play in a video are handled and billed like the rest. • It keeps going with the panel closed: close it and keep watching; the toolbar badge shows ON. • Requires Chrome™ 116 or later; also works in Edge, Opera, Vivaldi and Brave. • The API's terms apply (18+), and the API is not offered in every region. • The model picks the accent and variety it speaks: Arabic, for example, can come out in Egyptian rather than Modern Standard Arabic. • That model is a preview: if it changes or is retired, the extension needs an update. Support: support@dubbuddy.com · https://dubbuddy.com Frames in the screenshots: NASA imagery (ISS crew photography; Solar Dynamics Observatory, courtesy of NASA/SDO and the AIA science team) and NOAA photographs (National Marine Sanctuaries), public domain; the site shown is fictional. No endorsement by NASA or NOAA is implied. Gemini, Chrome and YouTube are trademarks of Google LLC. Use of these trademarks is subject to Google Permissions. Twitch is a trademark of Twitch Interactive, Inc. This is an independent project, not affiliated with or endorsed by either company.