> ## Documentation Index
> Fetch the complete documentation index at: https://help.descript.com/llms.txt
> Use this file to discover all available pages before exploring further.
# Automatic Speaker detection
> Have Descript find each voice and automatically label speakers once across a project.
When you record a conversation or interview with multiple participants, Descript can automatically detect distinct voices and help you label each [Speaker](/script-editing/speakers). You'll identify each participant once, and Descript applies those labels throughout your transcript.
## How speaker detection works
Speaker detection works in two steps:
1. **Detect**: When you import and transcribe a file, Descript's AI automatically analyzes the audio and identifies distinct voices. Automatic Speaker detection is available for files up to 5 hours long.
2. **Identify**: Once detection finishes, you'll get a notification prompting you to assign a name to each Speaker. Descript plays a sample of each voice so you can tell them apart and create labels.
After you identify your Speakers, Descript automatically applies labels throughout your script.
## Speaker detection modes
Speaker detection works differently depending on your selected mode (automatic or manual). This [app setting](/account-and-app-settings/app-settings) can be different between web and desktop apps, so check your settings in both [Descript for Web](/getting-started/descript-for-web) and [the desktop app](/getting-started/install).
| Automatic detection (default) | Manual detection |
| ------------------------------------------------------------ | -------------------------------------------------- |
| Runs automatically without asking for the number of speakers | Prompts you to select the number of speakers first |
| Up to 10 hours | Up to 3 hours |
| **Always ask before detecting speakers** is **OFF** | **Always ask before detecting speakers** is **ON** |
If your file exceeds these limits, the **Detect speakers** option will be disabled. You can check this by right-clicking the file — a tooltip will explain the time restriction.
## Detect and identify speakers
1. [Import your file into a project](/getting-started/import-overview). Descript begins detecting speakers in the background automatically as part of the [automatic transcription](/script-editing/automatic-transcription) process.
2. When detection is complete, you’ll get a notification. Click **Identify speakers**.
3. The **Identify speakers** modal will open. Listen to the audio sample for each detected voice to confirm who's speaking.
4. Add the speaker’s name, or select an existing name from the list.
5. When you’ve listened to all the samples, click **Close**.
6. [Add the file to your script panel](/getting-started/add-a-file-to-the-script) — the speaker labels will appear automatically in your transcript.
After you add speaker labels, Descript remembers them and applies them intelligently as you edit — even when you cut, copy, and paste among compositions.
## Manually trigger speaker detection
If automatic detection is disabled, speaker detection won't run when you import files. To trigger it manually, click the ellipsis next to your file in [the Project panel](/descript-tour/project-panel) and select **Detect speakers**. You'll be prompted to enter the number of speakers before detection begins.
If the Detect speakers option is unavailable, your file may exceed the 3-hour time limit for manual detection.