Video Dub Studio | Translate and Dub Videos Free

Translate and Dub Videos Free

Free video dubbing in your browser: transcribe, translate, add a voice and export SRT, WAV or MP4. Your video never leaves your device.

🔴 Who gets real value from a video dubbing tool in school?

• Teachers with recorded lessons. A 6-minute English walkthrough of a spreadsheet formula can be offered to Sinhala or Tamil medium students without re-recording it.
• Students making projects. A group video about a school science fair reaches relatives who do not speak the language of the original narration.
• Accessibility. Subtitles help students who are deaf or hard of hearing, and anyone watching without sound on a bus.

🟡 One sentence, from input to output

Take a single line from a lesson video. The narrator says “Save your work before you close the program.” starting at 2.0 seconds. The next sentence begins at 5.2 seconds, so this sentence has a 3.2 second slot.

• Transcribe: the tool stores the text with its start and end time.
• Translate (Spanish as an example): “Guarda tu trabajo antes de cerrar el programa.”
• Voice: the spoken Spanish clip comes out 4.0 seconds long, which is longer than the slot.
• Sync: the tool speeds the clip up by 4.0 / 3.2 = 1.25x so it ends before the next sentence starts. Your Max speed-up slider (default 1.35x) is the ceiling.

🟢 Mistakes that waste your time

• Skipping the edit step. Machine translation can mistranslate names, subject terms and jokes. Read the table in Tab 2 before you build any audio.
• Expecting a file from Browser voice. That engine only speaks live through your speakers. For a downloadable dub use a cloud engine, or use the Start recording button.
• Pausing while recording. The recording is real time. A pause shifts the voice against the picture.
• Starting with a long video. Try a 1 to 2 minute clip first, check the result, then process the full lesson.

🔵 Honest limits you should know

• Accuracy varies by language. The in-browser Whisper models are small. Clear speech with little background music works best, and Sinhala transcripts need more manual correction than English.
• Voice availability depends on the device. The tool shows whether your browser has a voice for the chosen language. If not, export subtitles or use a cloud voice.
• Speed-up changes pitch. Fitting long sentences by playing them faster can sound slightly high. Shorten the translated line in Tab 2 for a more natural result.
• Recording depends on the browser. Tab audio capture works in desktop Chrome and Edge, and some systems do not pass the browser voice into the recording.
• Large MP4 exports need memory. Dubbed video is made inside the browser, so short clips work best.
• Cloud voices and translation use your own API key, and your provider may charge for heavy use.

🟣 Use only what you have the right to dub

Dub your own videos or ones you have permission to adapt. Read more about the craft in the Wikipedia article on dubbing. To change a single spoken word instead of a whole video, try the Word-Level Audio Editor. To learn how the technology works, read How Speech Recognition and Text-to-Speech Work .

Last updated: October 2026