Dub English (US) Videos to Japanese
Paste a English (US) YouTube video and get it dubbed into Japanese in minutes — with AI voice cloning that captures the speaker's tone and emotion.
About English (US) to Japanese Dubbing
Japanese is spoken by 125 million people, primarily in Japan — the world's 3rd largest economy and a powerhouse of digital content consumption. Japan has one of the highest YouTube penetration rates globally, with audiences consuming billions of hours of video content annually. Dubbing into Japanese unlocks a premium market where localized content dramatically outperforms subtitled alternatives.
Dubbing Tips for Japanese
Japanese is a syllable-timed language with relatively consistent speaking speed. Sentences often end with the verb, creating a completely different rhythm from English (US). Our AI restructures content to sound naturally Japanese — not just translated — including proper use of politeness levels (keigo), natural sentence-final particles, and culturally appropriate expressions. Japanese audio tends to be 10-20% shorter than English, so the AI adjusts timing accordingly.
How It Works
Paste a URL
Paste any YouTube video URL. We automatically detect the spoken language.
Choose Your Language
Select from 140+ languages. Our AI adapts pacing and tone to sound natural in the target language.
Get Your Dubbed Audio
Our AI localizes the content — cloning the original voice, generating expressive speech, and mixing it seamlessly with the background music.
Frequently Asked Questions
Translation converts words from one language to another. Dubbing goes much further — it localizes the content for the target audience. Different languages have different speaking speeds, idioms, and cultural expressions. Our AI adapts pacing so speech fits naturally into the original timing, localizes sayings and expressions instead of translating them literally, and clones the speaker's voice so it sounds authentic. The result isn't just translated words — it's a fully localized experience.
A typical 5-minute video takes about 5-10 minutes to process. Our AI handles transcription, localization, voice cloning, and mixing all in one pipeline.
Our AI clones the original speaker's voice across all 140+ supported languages — not just their sound, but their tone, emotion, and speaking style. The result is natural, expressive speech that feels like the original person speaking in a new language.
We support 140+ languages including English, Spanish, French, German, Japanese, Korean, Chinese, Russian, Arabic, Hindi, and many more. Our top-tier voices cover the 9 most popular languages with the highest quality.
Yes! Our AI cleanly separates speech from music, dubs only the spoken parts, then mixes the new voice back with the original background audio — so nothing is lost.
Yes, SpeakSwap is currently free to use with no limits on video length or language pairs.
Currently, SpeakSwap supports single-speaker videos only. All speech is dubbed using one cloned voice. Multi-speaker support is on our roadmap.
Yes. Japanese has complex politeness levels (keigo) that vary by context. SpeakSwap's AI translates using an appropriate register — defaulting to polite (desu/masu) form for general content, which works well for most video dubbing. The voice cloning preserves the speaker's natural tone while delivering properly structured Japanese.
How We Compare
| Service | Price | Pricing Model |
|---|---|---|
| SpeakSwapCheapest | $0.33/min | Pay-as-you-go |
| Rask AI | $2.00/min | $50/mo subscription |
| ElevenLabs | $0.44/min | $22/mo subscription |
| HeyGen | $2.40+/min | $24/mo subscription |