Voice Generation Essentials

Generate natural-sounding speech from text with six AI voices, ten languages, and adjustable playback speed. Preview inline, download the audio file, or compose it directly onto a video.

Step 1: Choose a Voice & Language

CreativeAI offers six distinct voice presets, each with a different tone and character. Pair any voice with one of ten supported languages.

text

Available voices:
  alloy   — Neutral, balanced
  echo    — Warm, conversational
  fable   — Expressive, storytelling
  onyx    — Deep, authoritative
  nova    — Friendly, energetic
  shimmer — Soft, calm

Supported languages:
  en  English       zh  Chinese (Mandarin)
  ja  Japanese      ko  Korean
  es  Spanish       fr  French
  de  German        pt  Portuguese
  ru  Russian       ar  Arabic

Tip: nova and echo work well for marketing narration; onyx is ideal for documentary-style voiceovers.

Step 2: Write or Paste Your Script

Enter up to 5,000 characters of text. The API request is straightforward:

json

{
  "text": "Welcome to CreativeAI. Transform your scripts into professional voiceovers in seconds.",
  "voice": "nova",
  "language": "en",
  "speed": 1.0
}

The response includes the audio URL once generation completes:

json

{
  "id": "gen_abc123",
  "status": "COMPLETED",
  "output_url": "https://cdn.creativeai.run/audio/abc123.mp3",
  "credits": 8,
  "created_at": "2026-03-27T12:00:00Z"
}

Step 3: Adjust Playback Speed

Control pacing with the speed parameter. Values range from 0.5× (slow, deliberate) to 2.0× (fast, energetic). The default is 1.0×.

0.5×

Audiobooks, meditation

1.0×

Default, natural pace

2.0×

Ads, short-form video

Step 4: Preview, Download & Compose

Preview — The Audio Studio includes an inline player. Hit play to hear the result before downloading.

Download — Save the generated MP3 for use in any editing tool or DAW.

Compose with Video — Use the compose endpoint to merge your audio onto a video track, replacing or mixing the original audio.

Compose request — merge audio onto an existing video:

json

{
  "video_url": "https://cdn.creativeai.run/videos/my-video.mp4",
  "audio_url": "https://cdn.creativeai.run/audio/abc123.mp3",
  "replace_audio": true
}

Response (poll for status until COMPLETED):

json

{
  "id": "comp_xyz789",
  "status": "PROCESSING",
  "output_url": null,
  "credits": 5,
  "created_at": "2026-03-27T12:01:00Z"
}

Try It Now

Open the Audio Studio and generate your first voiceover — free credits included, no credit card required.

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