Sonix transcribes your MPA file and creates closed captions that make your content accessible to everyone.
MPEG-2 audio stream for digital media
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.
High-quality compressed audio
Sign up for Sonix's free trial. Includes 30 minutes free.
Upload your MPA file from your computer or cloud storage.
Choose from 53+ languages spoken in your file.
Sonix AI transcribes your MPA with word-level timestamps.
Fine-tune timing and formatting for accessibility.
Download closed captions in SRT, VTT, or SCC format.
Yes! Sonix transcribes your MPA file with precise timestamps and creates closed captions in standard formats.
Closed captions include non-speech elements like [music], [applause], and speaker identification. They're designed for deaf and hard-of-hearing viewers.
Yes! Sonix captions meet accessibility requirements when properly reviewed and edited. Our editor helps ensure timing and accuracy standards.
Export captions as SRT, VTT, SCC (for broadcast), and other formats. Each format has specific use cases.
Yes! Use our editor to add [music], [laughter], and other non-speech descriptions for full accessibility.
Absolutely! Captions make your video content searchable and improve accessibility, both of which can boost SEO rankings.
Create captions that make your content accessible to deaf and hard-of-hearing viewers.
Meet accessibility requirements with properly formatted closed captions.
Add non-speech elements like [music] and [applause] for full context.
Captions make video content searchable and improve discoverability.
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Fast and easy, and accurate. And searchable.
Of all the programs that do this, I found you the best!
I was amazed that Sonix picked up words that I couldn't even understand.
I love how quick, affordable and accurate it is, but what I like MOST is that the words are highlighted as the recording speaks them!
It's incredibly fast, and it sets the timing for subtitles perfectly. I dread having to time everything myself, and with Sonix I can do that just by pressing Enter!
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AI transcription and translation in 53+ languages.
