Add Voiceover

Replace a video's audio with a narrated voiceover and burn in matching captions. Bring your own script (plain, screenplay, or timestamped) — or leave it blank and a narration is auto-generated from the video's own dialogue. The video's length is never trimmed or looped.

Video to narrate

Only the selected tab's value is used — the others are ignored entirely.

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Script

Narration scriptPlain prose is read as-is. Screenplay/timestamped scripts are auto-cleaned. Blank = auto-generate from the video's own dialogue.Auto-clean screenplay / timed scriptsStrips timestamps ('[00:09]'), scene headers, and stage directions, then paces the lines to fit the video's own length (speeding up if needed). Turn off to read the script literally.Source languageOnly used when auto-generating a script — forces the Whisper language for transcribing the video's dialogue.

Audio bed

What plays underneath the new narration.

Voiceover onlyNothing but the narration.Music + voiceoverExtracts the source's vocal-free music/ambience (Demucs) and mixes it under the narration.Original + voiceoverKeeps the full original audio (dialogue included), lowered under the narration.

Aspect ratioReframe the video, or keep it as-is if it's already correctly framed.

Voice

TTS engineFree, fully offline. Voices scanned from assets/piper/.

Free, fully offline. Voices scanned from assets/piper/.

Voice

Template

Previews are rendered by the actual caption engine on a frame from your own library — what you see is what your video gets.

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Add emojiContextual emoji placed just above the captions, timed to the speech. Sparingly — only where one clearly fits.Highlight keywordsOnly available on phrase templates (every template except Default) — Default shows one word at a time.

Choose a source video first.