# Transcribe and redact an audio file

You can send an audio file to the Tonic Textual SDK. Textual creates a transcription of the audio file, and then redacts the transcription text as a string.

## Audio file limitations

The file must be 25MB or smaller, and must be one of the following file types:

* m4a
* mp3
* webm
* mp4
* mpga
* wav

## Sending the transcription and redaction request

To transcribe and redact an audio file, you use [`textual.redact_audio_file`](https://tonic-textual-sdk.readthedocs-hosted.com/en/latest/audio/api.html#tonic_textual.audio_api.TextualAudio.redact_audio_file).

<pre class="language-python" data-overflow="wrap"><code class="lang-python"><strong>redaction_response=textual.redact_audio(&#x3C;path to the audio file>)
</strong><strong>redaaction_response.describe
</strong></code></pre>

The request includes the [entity type handling configuration](https://docs.tonic.ai/textual/tonic-textual-api/datasets-redaction/api-redaction-entity-type-handling).

The [redaction response](https://docs.tonic.ai/textual/tonic-textual-api/textual-api-redact-strings#api-redact-string-response-format) includes the redacted or synthesized content and details about the detected entity values.