About AAC files
AAC is a compressed audio codec; a raw .aac file is common from broadcast tools, some recorders and audio extracted from videos.
Common sources: audio extracted from MP4s, broadcast and radio tools, some dash-cam and body-cam exports.
Browsers read raw AAC (ADTS) files.
AAC to text
If you already have the original video, you can use it directly instead — the audio is extracted for you.
A radio producer transcribes a 30-minute AAC segment to prepare a web article.
Cost: 30 credits (3¢).
Translating a AAC
The translated voice comes back as M4A, which holds the same AAC audio in a more widely supported container.
A community broadcaster translates a 10-minute AAC news segment into Arabic audio.
Cost: 500 credits (50¢) with a translated voice, or 10 credits (1¢) for translated text only. Switch Full translation output on in the tool above for a voice track.
Using the tool on this page
- The spoken language is detected automatically; you select the output language — the spoken language itself for an untranslated transcript, or another language for a translation. Files can be up to 2 hours long.
- Audio is sent over HTTPS in small chunks and deleted with its transcripts within 30 minutes of delivery (how files are protected).
- You can download a timestamped transcript, subtitles (SRT and VTT) and plain text. Every output, step and limit is explained on the audio to text page.
Frequently asked questions
What's the difference between AAC and M4A?
M4A is AAC audio inside an MP4 container; .aac is the raw stream. Both work.
Can I translate an AAC file directly?
Yes — drop it into the audio workspace and choose a language.