VoiceSwap.AI

Swap the voice.
Keep the soul.

Replace any voice in your video while preserving emotion, tone, and timing. Gemini analyzes the soul. Google TTS delivers it in a new voice.

Gemini 2.5 FlashIntelligence Layer

Google Cloud TTSVoice Synthesis

ADK AgentOrchestration

ffmpegVideo Processing

How It Works

Five steps to a new voice

The full pipeline from raw video to download — all automatic.

Upload Video

Drop any MP4 or MOV. Up to 2 minutes.

Gemini Analyzes

Transcription, emotion, tone and pacing in a single API call.

Pick a Voice

6 Chirp3 HD voices — the highest quality Google TTS offers.

TTS Synthesizes

Gemini-authored SSML drives a truly expressive performance.

Download

New voice merged into your video. Ready to share.

Why VoiceSwap

Built different

Gemini as Voice Director

Not just a transcriber. Gemini detects emotion segments, emphasis words, and writes expressive SSML performance notes — the creative intelligence of the pipeline.

Expressive Synthesis

Google Cloud TTS receives Gemini-authored SSML so it speaks with the same energy, pace, and emotional emphasis as the original speaker. Different voice, same soul.

Full Pipeline, One Click

Upload → Gemini analyze → SSML → TTS synthesize → ffmpeg merge. The entire pipeline runs automatically and delivers a download-ready video in under a minute.

The Intelligence

Gemini doesn't just transcribe.
It directs.

Transcribes

Full text with word-level timestamps.

Analyzes emotion

Tone, energy, pace, and emphasis per segment.

Writes SSML

Tells Google TTS exactly how to perform the text.

voice_direction.jsonGemini output

{
  "overall_tone": "calm and explanatory",
  "pace": "moderate",
  "energy": "medium",
  "emphasis_words": [
    "important", "remember", "key"
  ],
  "ssml_hints": "Speak clearly with slight enthusiasm, pause naturally after key points"
}

Generated by Gemini 2.5 Flash · Drives SSML for Google TTS

Free to try — no account needed

Ready to swap?

Upload a video, let Gemini analyze the emotional soul of the speech, and receive it back in a new expressive voice — merged into your video.

Swap the voice.Keep the soul.