Feature
Replace the audio in your video with a natural AI voice in any of 60+ languages. Timed segment by segment, exported as a standalone audio track or a fully dubbed MP4.
check_circleOpenAI TTS voicescheck_circlePay per minutecheck_circleNo re-recording needed
Capto’s AI dubbing feature replaces the spoken audio in your video with a natural-sounding text-to-speech voice in any language you’ve translated into. Powered by OpenAI TTS, the dubbed audio is generated segment by segment, timed precisely to the original subtitle timestamps so speech stays in sync with on-screen action. Download the dubbed audio track alone, or export a fully dubbed and burned-in MP4 with both the translated subtitles and the new voice track combined — no re-recording, no studio, no post-production software required.
Traditional dubbing is how films are localised for international markets: human voice actors record new dialogue in the target language, a sound engineer syncs the new audio to the video, and the result is a version of the film that sounds like it was originally recorded in that language. It takes weeks and costs thousands of dollars per minute of content.
AI video dubbing replaces the voice actor step with text-to-speech synthesis. The workflow is: transcribe the original speech, translate it into the target language, generate TTS audio for each line, time the audio clips to the original segments, and mix the result with the video. The entire process takes minutes rather than weeks, and costs a fraction of professional localisation.
The trade-off is fidelity: AI TTS voices are natural-sounding but generic — they don’t replicate the original speaker’s voice, and they don’t match lip movements. For content where reach matters more than perfect likeness — courses, tutorials, corporate training, explainers — AI dubbing is a practical and affordable path to multilingual content.
Dubbing in Capto is a pipeline that builds on transcription and translation — you don’t need to re-upload the video at each step. Once a transcript exists in your workspace, it can be translated and dubbed from the same screen without touching the original file.
Capto offers two dubbed export formats. Which one to use depends on what you’re doing with the file next.
Downloads the dubbed audio track as a standalone file. Use this when you want to mix the audio yourself in a video editor, replace the audio on an existing platform upload, or deliver the dub to a client separately. Useful for podcasters who want a dubbed audio feed without touching the video.
Best for
Produces a complete MP4 with the dubbed audio track mixed in and the translated subtitles burned directly into the video frames. Nothing extra to configure — upload it to YouTube, Instagram, LinkedIn, or any platform and both the voice and captions are already baked in.
Best for
For videos with more than one speaker — podcast episodes, interviews, panel discussions, two-person vlogs — Capto’s speaker diarization feature identifies and labels each speaker in the transcript before translation and dubbing begin. Enable it at upload time by toggling the diarization option; it routes the audio through AssemblyAI’s speaker separation model and applies a 1.5× credit multiplier on transcription.
With diarization enabled, the transcript shows each line attributed to its speaker (Speaker A, Speaker B, etc.). The dubbed output preserves these speaker transitions: each speaker’s segments are processed in sequence, and the assembled audio track reflects the original back-and-forth structure of the conversation. The TTS voice is consistent within each speaker’s segments.
This makes diarized dubbing particularly useful for podcast video uploads on YouTube and Spotify Video, where clear speaker attribution helps viewers follow a conversation in a language they understand better than the original.
AI dubbing is genuinely useful for a wide range of content, but it has real limitations. Being clear about them upfront will help you decide if it’s the right tool for your specific use case.
The dubbed voice does not match the original speaker
Capto uses a standard AI TTS voice — it will not sound like the person in your video. The output is natural-sounding, but a listener will notice the voice is different. Voice cloning (matching the original speaker's voice) is not currently available.
Lip sync is not yet supported
The dubbed audio is timed to the subtitle segments, but the video frames are not altered — the speaker's lip movements will not match the new language. This is a known limitation of TTS-based dubbing across all current tools. AI lip-sync generation is on the roadmap.
Background music and sound effects may be affected
The dub-and-burn export mixes the dubbed speech track with the original video audio. Capto does not isolate or stem-separate the original audio, so background music, ambient sound, and sound effects that overlap with speech may be partially overwritten or clash with the dubbed voice. For music-heavy content, the audio-only export and manual mixing in a DAW or video editor gives better results.
Speech rate may differ from the original
If the translated text is significantly longer or shorter than the original, the TTS speech rate is adjusted to fit the original segment duration. A 20–30% difference in text length is handled well. Very long translations relative to the original timing may sound rushed; very short ones may sound slow. Editing translated segments in the workspace before dubbing helps here.
Not currently. Capto's dubbing generates a new audio track timed to the subtitle segments, but the video frames are not modified — the speaker's lip movements will not match the dubbed language. The audio stays in sync with the on-screen action, but lip sync requires AI face-reenactment technology that is not yet part of Capto. This is an honest limitation shared by all TTS-based dubbing tools available today.
You can dub into any of the 60+ languages available in Capto's translation feature, powered by GPT-4o-mini. This includes Spanish, French, German, Japanese, Chinese, Arabic, Hindi, Portuguese, Korean, Italian, Russian, Dutch, and many more. The dubbed language must first exist as a translated subtitle track in your Capto workspace — you translate first, then dub.
Dubbing cost builds on the steps that come before it: transcription (1 credit per minute), translation (0.2 credits per minute per language), and TTS generation for the dubbed audio. The exact TTS cost depends on the volume of text generated. Re-exporting a previously generated dub is free — the audio is cached in your workspace. All credits are purchased once and never expire.
OpenAI TTS produces natural, fluent speech across all supported languages — noticeably better than older robotic TTS systems. For most spoken content (lectures, vlogs, interviews, explainers), the result is clear and easy to follow. The dubbed voice will not match the original speaker's accent, pitch, or delivery style. For content where the speaker's voice is central to the brand — like a well-known YouTube personality — subtitles-only may be a better fit than dubbing.
Yes. Podcasts with multiple hosts are a good fit for Capto's multi-speaker diarization feature, which labels each speaker in the transcript before translation and dubbing. Enable diarization at upload time (1.5× credit multiplier on transcription). Each speaker's segments are processed separately, and the dubbed audio reflects the speaker transitions. Download the audio-only export to replace the audio track on your podcast feed or video version.
Subtitles are text captions displayed on screen while the original audio plays — the viewer reads the translation in their language but hears the original speaker's voice. Dubbing replaces the original audio entirely with a new voice (or, in Capto's case, AI-generated text-to-speech) in the target language — the viewer hears speech in their language without needing to read. Subtitles are cheaper and quicker to produce; dubbing requires more steps but feels more natural for audiences who prefer listening over reading.
Yes. Capto offers two export options after dubbing: audio-only (just the dubbed speech track as a standalone audio file) and dub-and-burn MP4 (the dubbed audio mixed with the original video, with translated subtitles burned into the frames). The audio-only export is useful when you want to mix the audio yourself in a video editor, replace the audio on an existing platform upload, or deliver a dubbed audio feed for a podcast without re-exporting the full video.
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