Transcribe AAC to text, free
Upload an AAC file and get the text with each speaker and their time, without converting it first. No account: the first 10 minutes of each file, up to 3 files a day.
Drop your audio or video here, or choose a file
MP3, M4A, WAV, OGG and OPUS (WhatsApp voice notes), MP4, MOV, WEBM… Up to 200 MB.
Free, no account needed: the first 10 minutes of each file, 3 a day. The file is deleted when it’s done and the result after 24 hours.
What an AAC is
AAC is a compressed audio codec, MP3’s successor: at the same size it sounds better. It almost always sits inside an M4A or MP4, but some apps and devices save it on its own, with the .aac extension.
Where they usually come from
Standalone .aac files mostly turn up in these cases:
- Voice recorders on some Android phones.
- Dictation and call recording apps.
- Radio shows and recorded internet broadcasts.
- Audio exported from editing programs.
Tips
To get the most out of it:
- Don’t convert it to MP3 first: every conversion loses a little quality.
- If you have the same audio as AAC and M4A, it doesn’t matter which you upload: the sound is the same.
- On the radio, speech over music may come out with more mistakes than clean speech.
How to do it
- 1
Upload the AAC
Drag it into the tool on this page or choose it from your computer or phone, up to 200 MB.
- 2
Wait a moment
Echo detects the language, writes down what’s said and separates each speaker.
- 3
Copy or download the text
With times and speakers or just the text, to paste anywhere or save as TXT.
Frequently asked questions
What’s the difference between AAC and M4A?
AAC is the codec, the way the sound is compressed; M4A is the container that usually carries it. An .aac file is that same sound without a container. The tool accepts both.
Does it work for call recordings?
Yes, if you have the file. Always tell the other person before recording. Bear in mind that phone-quality sound tends to cause more mistakes with proper names and numbers.
Does the text show who’s speaking?
Yes. Echo separates each speaker and marks the minute of each turn. You can download the text with times and speakers or just the text.
By format
Try it with your next meeting.
Create your account in a minute or ask us for a demo for your team.
