The Rundown: Transform AI-generated videos by replacing their default voices with custom voices using Google Veo, audio conversion tools, and ElevenLabs voice cloning technology.

🧰 Who is this useful for:

• Content creators building consistent character narratives
• Video producers wanting personalized AI avatars
• Storytellers creating multi-character content with unique voices
• Digital marketers developing branded video content with custom voiceovers

STEP 1: Create and Download Your AI Video

Start by generating your video with sound using Google Gemini. Once you're satisfied with the visual content, download the video file to your computer. The video will come with a default AI-generated voice that we’ll be replacing in the following steps.

Note: If you need help creating consistent AI characters or generating videos, there are other tutorials available that cover the video creation process in detail.

STEP 2: Extract the Audio from Your Video

To work with the voice separately, you'll need to convert your video file to an audio format. Head over to any online file converter. CloudConvert is a reliable option that often appears in top search results.

Upload your MP4 video file and select “Convert to MP3” as your output format. Click “Convert” and wait for the process to complete. Once finished, download the MP3 file. This extracted audio will serve as the base for your voice replacement.

STEP 3: Clone and Replace the Voice

Navigate to ElevenLabs and access their “Voice Changer” feature. If you haven't cloned your voice before, you can either select from their library of pre-made AI voices or create your own voice clone.

To clone your voice, click on “Voices” then the plus button. Choose either “Instant Voice Clone” for quick results or “Professional Voice Clone” for higher quality (requires 30 minutes of clean audio). Upload the MP3 audio file you extracted in Step 2.

In “Voice Changer”, adjust the settings to fine-tune your voice replacement:

• Stability: Higher values create more consistent voice output
• Similarity: Increase this to make the voice sound closer to your target voice
• Speaker Boost: Toggle this based on whether it improves the voice quality

Click “Generate Speech” to process your audio with the new voice, then download the final MP3 file.

STEP 4: Combine the New Audio with Your Video

Open CapCut or any video editing software of your choice. Upload both your original video file and the new voice-changed audio file to the editor.

Drag and drop both files onto the timeline. Make sure to mute the original video’s audio track since you’ll be using the new voice-changed audio instead. Align the new audio with the video timing, and you're done!

Export your final video with the custom voice replacement. You now have complete control over how your AI characters sound, enabling you to create more personalized and consistent content.

Pro tip: Save your voice clones in ElevenLabs for future projects to maintain character consistency across multiple videos.