How do I accurately convert my MPA files to closed captions? 
Sonix uses the latest automated transcription technology to convert your audio files (*.mpa) 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 MPA to captions conversion.
Step 2
Upload the MPEG-2 Audio File file(s) (*.MPA) from your computer, Dropbox, Google Drive, or by dragging it on the page.
Step 3
Choose the language spoken in the uploaded MPA file. We support over 49 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 MPA 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 MPA file. You can also adjust the character length and time duration length of each caption.
That's it! Your MPA 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 MPA files with Sonix 
Frequently Asked Questions for MPEG-2 Audio File (*.MPA) to subtitle 
What is a MPA file?
MPA files are audio files compressed using the MPEG Layer II compression codec to reduce the file size while only slightly impacting the overall sound quality. Digital music and high quality audio programming such as podcasts are usually compressed for web users with this format. The MPA file format uses the MPEG-2 specification for compression to reduce file size for better transmission across the internet.
Does Sonix transcribe audio files with a *.MPA file extension?
Yes, Sonix does automatically transcribe audio files with a .MPA file extension. Sonix is an online audio to text converter. Convert any audio (mpa, mp3, m4a, wav, ...) or video (mp4, mov, avi, ...) file to text without installing any software! Sonix quickly and accurately transcribes *.MPA files and converts them to text in a subtitle format.
Know anyone who needs to convert MPEG-2 Audio File (.MPA) to subtitle?
We'd appreciate it if you tell them about Sonix—the best way to convert MPA to subtitle.
Other ways to convert your MPA audio files with Sonix
MPA to text
Use the most accurate speech-to-text technology to convert files: MPA to text.
MPA to docx
Accurately transcribe your MPA file to Microsoft Word Format (docx) so you can bring the transcript into your workflow.
MPA to PDF
Easily transcribe your MPA file to Adobe's Portable Document Format (pdf) so you can share them with colleagues.
MPA to subtitles
Create subtitles for your MPA files to make them more accessible for your audience.
MPA to srt
Quickly create subtitles from your MPA files and save them as SRTs, one of the most widely supported subtitle formats.
MPA to VTT
Create more advanced captions for your MPA files by using the latest caption format VTT (Video Text Tracks).
Create closed captions from your MPEG-2 Audio File files with Sonix 
Sonix automatically transcribes and translates your audio/video files in 49+ languages. Easily search, edit, and share your media files. Sonix is an online, fully-automated speech to text service that quickly converts MPEG-2 Audio File files to captions. Fast, accurate, and affordable. Millions of users from all over the world.
Includes 30 minutes of free transcription
