How to Add Multi-Speaker AI Narration to Your Presentations

Single-voice narration works for simple presentations. But for engaging content — training videos, podcast-style reports, conversational explainers — you need multiple speakers. 2Slides offers multi-speaker AI narration with 8+ distinct voices, creating dialogue-style presentation videos that sound natural and professional.

Single vs. Multi-Speaker Narration

Available AI Voices

2Slides provides 8+ professional AI voices:

How It Works

Step 1: Generate Your Slides

Create a presentation using any method:

• Type your topic for AI generation
• Upload a document (PDF, DOCX, XLSX)
• Use Create Like This with a reference design

Step 2: Enable Voice Narration

In the workspace, click the Voice Narration option:

1. Choose narration mode:

   • Single Speaker — one consistent narrator
   • Multi-Speaker — two speakers in dialogue format

2. Select voices (Multi-Speaker):

   • Speaker 1: Choose primary voice (e.g., Charon for analyst)
   • Speaker 2: Choose secondary voice (e.g., Aoede for interviewer)

3. Set content mode:

   • Concise — brief narration per slide (~15-30 seconds each)
   • Standard — detailed narration per slide (~30-60 seconds each)

4. Choose language:

   • Same 22+ languages as slide generation
   • Voices adapt to the selected language

Step 3: Generate and Preview

Click Generate Voice. The AI:

1. Analyzes each slide's content
2. Creates a natural dialogue script (multi-speaker)
3. Generates voice audio using Gemini TTS
4. Syncs audio with slide transitions

Preview each slide's narration in the built-in audio player.

Step 4: Export as Video

Once narration is complete, export as video:

• 16:9 — standard presentation format
• 9:16 — vertical video for social media

The video combines slide visuals with synchronized voice narration as an H.264 MP4 file.

Multi-Speaker Dialogue Examples

Analyst + Executive

Slide: Revenue Growth

Analyst (Charon): "Revenue reached 4.2 million dollars this quarter, an 18% increase quarter over quarter." Executive (Aoede): "What's driving this growth?" Analyst (Charon): "Enterprise segment expansion — now 42% of total revenue, up from 35% last quarter."

Teacher + Student

Slide: Cell Biology

Teacher (Kore): "Mitochondria are often called the powerhouse of the cell. They convert nutrients into ATP, the energy currency cells use." Student (Puck): "So without mitochondria, cells couldn't produce energy?" Teacher (Kore): "Exactly. That's why mitochondrial dysfunction is linked to so many diseases."

Host + Guest

Slide: Product Launch

Host (Puck): "Tell us about the new feature you're launching today." Guest (Fenrir): "We've built an AI-powered analytics dashboard that reduces reporting time by 80%."

API: Generate Narration Programmatically

# Add narration to an existing job
POST https://2slides.com/api/v1/slides/generate-narration
Authorization: Bearer sk-2slides-xxx
Content-Type: application/json

{
  "jobId": "your-job-id",
  "mode": "multi",
  "voice": "Charon",
  "voice2": "Aoede",
  "contentMode": "standard",
  "language": "en"
}

Best Practices

1. Match voices to roles — authoritative voice for data/facts, friendly voice for questions/context
2. Use Concise mode for <5 minute videos — keeps the pace energetic
3. Use Standard mode for training — ensures thorough explanation
4. Preview before exporting — listen to the narration and regenerate specific slides if needed
5. Consider your platform — 16:9 for YouTube/presentations, 9:16 for Instagram/TikTok

Frequently Asked Questions

Can I edit the narration script?

The AI generates the script automatically based on slide content. You can regenerate specific pages with adjusted prompts to refine the narration.

How many voices can I use simultaneously?

Multi-speaker mode supports 2 voices in dialogue format. For single-speaker mode, you can choose any one voice.

Does the narration work with any language?

Yes — all 22+ supported languages work with voice narration. The AI generates language-appropriate narration scripts and uses voices optimized for each language.

How much does narration cost?

Voice narration credits are included in your standard credit balance. Video export costs 20 credits per slide page.

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Create podcast-style presentations — add multi-speaker narration with 2Slides.