Pricing
from $40.00 / 1,000 voiceover generateds
AI Text-to-Speech Voiceover
Turn text or a script into a natural AI voiceover audio file. Pick from multiple voices, speed, and format (MP3/WAV/Opus/AAC). Handles long scripts automatically. For faceless videos, narration, audiobooks, and podcasts. Bring your own OpenAI API key.
Pricing
from $40.00 / 1,000 voiceover generateds
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5.0
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Turns a block of text or a full script into a natural-sounding AI voiceover file. Pick a voice, set the speed, and choose MP3, WAV, Opus, or AAC. It's meant for the usual narration jobs: faceless videos, audiobooks, IVR prompts, explainer voiceovers.
How it works
The actor sends your text to an OpenAI-compatible TTS endpoint. Long scripts get split at sentence boundaries into chunks under ~3,500 characters, each chunk is synthesized separately, and the parts are stitched back into one file with ffmpeg (using stream copy, so there's no re-encode and no quality loss). Each finished audio file is saved to the run's key-value store and a row is pushed to the dataset.
Input
Nothing is strictly required by the schema, but in practice you need an openaiApiKey and at least one of text or texts. If neither is provided the run errors out.
| Field | Required | Notes |
|---|---|---|
text | one of text/texts | The script to voice, as a single string. |
texts | one of text/texts | Batch mode. Array of strings, or objects keyed by script / scriptText / text / narration. One audio file per item. |
voice | no | alloy, echo, fable, onyx, nova, shimmer. Default onyx (deep male). nova and shimmer are female. |
model | no | tts-1 (fast, default) or tts-1-hd (higher quality, costs more on the OpenAI side). |
format | no | mp3 (default), wav, opus, or aac. |
speed | no | Playback speed from 0.25 to 4.0. Default 1.0. Values outside that range are clamped. |
openaiApiKey | yes in practice | Your OpenAI key, used for the TTS call. Stored as a secret. Falls back to the OPENAI_API_KEY env var if set. |
baseUrl | no | Advanced. Point at any OpenAI-compatible /audio/speech endpoint. Defaults to https://api.openai.com/v1. |
Output
Each input item produces one audio file in the key-value store and one dataset record. The record includes audioKey and audioUrl (where to fetch the file), durationSeconds, characters, chunks (how many pieces the script was split into), plus the voice, model, and resolved format. Failed items get a record with ok: false and the error message instead of stopping the whole run.
Example
Pricing
$0.04 per voiceover, pay per result, no subscription. The OpenAI TTS usage is billed separately on your own key.
Notes
This actor calls OpenAI for synthesis, so it needs your own OpenAI API key. Individual chunks are capped at 4,000 characters before they're sent, which keeps each request within the model's per-call limit; there's no hard limit on total script length since long inputs are chunked and concatenated.
