Free AI Video Dubbing

Yes. You can upload a video and generate a full dubbed version for free, including voice cloning and lip sync. The free experience is fully functional so you can evaluate quality on real content before upgrading. Paid plans unlock higher usage, more languages, advanced editing controls, and enterprise features like bulk dubbing and API access.

Synthesia supports 140+ languages and dialects for AI dubbing, including right‑to‑left scripts and regional variants. Popular options include: English, Spanish, French, German, Portuguese, Italian, Dutch, Russian, Chinese (Mandarin), Japanese, Korean, Arabic, Hindi, Bengali, Turkish, Vietnamese, Thai, Indonesian, Polish, and Swedish.

Many languages include regional accent options, so you can target British or American English, Latin American or Castilian Spanish, and so on

See a full list of supported languages here.

Yes. Synthesia automatically detects multiple speakers and clones each voice separately, so dubbed versions maintain distinct voice identities for every speaker. This works for interviews, panel discussions, training videos with multiple presenters, and any content where more than one person speaks.

Yes. After a dubbed video finishes generating, you can open it in the editor and correct any line in the translated script. Click any segment, make your changes, and regenerate. Proofreading and retranslating dubbed videos does not consume additional credits, so you can iterate on accuracy as much as you need without worrying about the cost. This is especially useful for fixing company names, product terms, or any phrasing that sounds off in the target language.

Synthesia's AI dubbing accepts MP4, MOV, and WebM files, and supports resolutions up to 4K. You can also dub directly from a YouTube link. Everything runs in the browser with no software to install.

To dub a video with Synthesia, you must have all necessary rights, licenses, and permissions for the content you're uploading. This means you need to own the video or have explicit permission from the copyright holder to create translated versions, including rights to any voices, images, and other content appearing in the video.

Synthesia's content moderation automatically rejects political, discriminatory, and inappropriate content, but legal responsibility for ensuring proper rights and permissions rests with you.

Yes, subtitles are auto-generated for every dubbed video. Viewers can toggle them on or off directly in Synthesia's Multilingual Player, so you don't need to create or upload a separate caption file. This makes dubbed content accessible by default and satisfies closed captioning requirements without additional effort.

Yes, and this is worth doing. In the platform, before you click Generate, you can use the Review Transcript step to check and correct what Synthesia heard in the original video. This step is free and does not consume any credits. Fixing errors at this stage, such as misheard names or technical terms, means your dubbed output will be more accurate and you won't need to regenerate afterward.

Open the dubbed video in the editor, find the relevant segment in the script box, and retype the word or phrase. You can also use Synthesia's Pronunciation Controls to set a custom pronunciation for terms that the AI consistently misreads. Once you've made your changes, click Generate to apply them.

Yes. If you have a large catalog to localize, Synthesia's Dubbing API lets you submit multiple videos programmatically. You can also use the Synthesia Add-in for Excel to manage and trigger dubbing jobs directly from a spreadsheet, making it practical to run hundreds of localization projects without handling each video manually.