Free AI Video translator

Synthesia is widely considered the best AI video translation tool for business use. Where most tools stop at subtitle generation, Synthesia produces fully dubbed video with state-of-the-art lip sync, high fidelity voice cloning, and subtitles generated automatically alongside every dubbed version.

The built-in transcript editor lets you refine translations and adapt terminology before publishing. For teams working at scale, Synthesia also offers live collaboration, analytics, and enterprise-grade AI governance controls, making it the only video translation platform that regulated industries can take through procurement with confidence.

A single smart link serves each viewer their language automatically, with no need to manage separate video files per market.

Yes, the AI video translator is free to use. Sign up without a payment method and you can run the complete translation workflow on your own content, from upload through to a dubbed, lip-synced output you can review and download.

Synthesia supports 130+ languages, including English, Spanish, French, German, Portuguese, Italian, Japanese, Korean, Mandarin Chinese, Hindi, Arabic, Turkish, Russian, Polish, Indonesian, Thai, and Vietnamese, among others. Many languages include regional accent options, so you can target British or American English, Latin American or Castilian Spanish, and so on, rather than defaulting to a generic regional variant. See a full list of supported languages here.

You can select multiple target languages in a single translation job and generate all versions simultaneously. Synthesia also auto-detects the source language of your video on upload, so you do not need to specify it manually.

Yes. Paste your video’s public YouTube URL into the translator and Synthesia pulls the video and transcribes the audio automatically. You then select your target languages and generate dubbed versions exactly as you would with an uploaded file. This is particularly useful for repurposing existing published content such as webinars, product demos, and recorded training sessions, without needing to track down the original source file.

Yes. Synthesia's voice cloning captures tone, timbre, pacing, and speaking style from the source audio and applies those characteristics to the translated version in each target language. The result is high fidelity audio with more expressive, natural-sounding output across a wider emotional range than older AI dubbing systems. Source audio quality affects clone accuracy, so cleaner recordings tend to produce more reliable results. You can also replace any speaker's voice with a stock or custom cloned voice if needed.

Most videos are ready to review within minutes of upload. All target languages are processed in parallel, so translating into 10 languages does not take 10 times as long as a single-language translation. Video length is the main factor affecting processing time.

Traditional dubbing involves script translation, casting, studio booking, recording, and post-production sync, a process that typically takes days to weeks per language.

Synthesia uses a state-of-the-art lip sync model that delivers tight alignment across fast cuts and transitions, reliably matching speech to the correct on-screen speaker.

One technical challenge in any dubbing system is that languages expand and contract significantly in translation. A 10-word English sentence might become 7 words in Japanese or 14 in German. Synthesia offers two ways to handle this:

• Adaptive mode: adjusts speech speed to fit the original video timing naturally. Best for instructional content where natural voiceover pacing matters most.
• Original mode: maintains the original playback speed and lets the translated audio run at its natural length. Best for fast-paced content where changes in video speed would be noticeable.

Where the result needs refinement, the transcript editor lets you adjust wording and retranslate. Proper nouns, fast speech, and heavy accents in the source are the most common cases where manual refinement helps.

Yes. Editing does not consume additional credits. The editor gives you access to the transcript for every language version, and edits to one language do not affect the others.

You can correct mistranslations, localize terminology, fix misheard company names or technical terms, split or merge segments, and replace speaker voices with stock or custom cloned voices. When you are ready, select Generate to apply changes and republish the video.

No. Synthesia transcribes your video automatically on upload. If anything needs correcting before translation begins, such as a product name, a technical abbreviation, or a regional term, edit the transcript first and the corrected version becomes the basis for all target language translations.

If you already have an approved transcript or subtitle file you want to use, upload it manually to override the automatic transcription. This is especially useful when source audio quality is poor or the video contains dense technical language that benefits from a pre-approved script.

Download individual translated video versions as MP4 files, or download subtitles as SRT files per language, which is useful for uploading to YouTube, an LMS, or any platform that handles video distribution separately.

For direct sharing, a single smart link detects each viewer's browser language and serves the matching dubbed version automatically, with a manual language selector for anyone who wants to switch. To embed on a website, Synthesia's multilingual player hosts all language versions under one embed code, so you do not need separate embeds per market or to update the page when you add new language versions.