How do I accurately convert my AAC files to closed captions? 
Sonix uses the latest automated transcription technology to convert your audio files (*.aac) to closed captions. Follow these six steps and see how magical it is:
Step 1
Sign up for a free Sonix trial account—includes 30 minutes of free AAC to captions conversion.
Step 2
Upload the Advanced Audio Coding File file(s) (*.AAC) from your computer, Dropbox, Google Drive, or by dragging it on the page.
Step 3
Choose the language spoken in the uploaded AAC file. We support over 50 different languages including Russian, Chinese, Spanish, and English. Click the 'Start Transcribing Now' button.
Step 4
Sonix will then automatically transcribe the audio from your AAC file and convert it to a simple text format. Grab a cupcake, it will take only a few minutes.
Step 5
Use the Sonix AudioText Editor to polish your transcript before we convert it to a caption file. Simply type in your browser to correct any words in your transcript.
Step 6
Click the 'Export' button. Choose either 'Subrip subtitle file (.srt)' or 'WebVTT file (.vtt)' from the dropdown to download the closed caption version of your AAC file. You can also adjust the character length and time duration length of each caption.
That's it! Your AAC file has now been converted to closed captioning and is ready for the next step in your workflow!
Thousands of customers create closed captions from their AAC files with Sonix 
Frequently Asked Questions for Advanced Audio Coding File (*.AAC) to subtitle 
What is a AAC file?
Advanced Audio Coding (AAC) is the default encoding used by Apple iTunes and the iTunes Music Store. It is a compressed audio file similar to an .MP3 file, but offers several performance improvements; examples include a higher coding efficiency for both stationary and transient signals, a simpler filterbank, and better handling of frequencies above 16 kHz; maintains quality nearly indistinguishable from the original audio source.
Does Sonix transcribe audio files with a *.AAC file extension?
Yes, Sonix does automatically transcribe audio files with a .AAC file extension. Sonix is an online audio to text converter. Convert any audio (aac, mp3, m4a, wav, ...) or video (mp4, mov, avi, ...) file to text without installing any software! Sonix quickly and accurately transcribes *.AAC files and converts them to text in a subtitle format.
Know anyone who needs to convert Advanced Audio Coding File (.AAC) to subtitle?
We'd appreciate it if you tell them about Sonix—the best way to convert AAC to subtitle.
Other ways to convert your AAC audio files with Sonix
AAC to text
Use the most accurate speech-to-text technology to convert files: AAC to text.
AAC to docx
Accurately transcribe your AAC file to Microsoft Word Format (docx) so you can bring the transcript into your workflow.
AAC to PDF
Easily transcribe your AAC file to Adobe's Portable Document Format (pdf) so you can share them with colleagues.
AAC to subtitles
Create subtitles for your AAC files to make them more accessible for your audience.
AAC to srt
Quickly create subtitles from your AAC files and save them as SRTs, one of the most widely supported subtitle formats.
AAC to VTT
Create more advanced captions for your AAC files by using the latest caption format VTT (Video Text Tracks).
Create closed captions from your Advanced Audio Coding File files with Sonix 
Sonix automatically transcribes and translates your audio/video files in 50+ languages. Easily search, edit, and share your media files. Sonix is an online, fully-automated speech to text service that quickly converts Advanced Audio Coding File files to captions. Fast, accurate, and affordable. Millions of users from all over the world.
Includes 30 minutes of free transcription
