How to convert MP4 to closed captions with Sonix

Sonix converts your audio-to-text using the latest artificial intelligence algorithms—it's fast, easy, beautiful, and affordable. We extract the speech from your MP4 file and help you create captions for your videos in minutes.

Convert MP4 to captions
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How to convert MP4 to closed captions with automated transcription 📋

Step 1: Create a free Sonix account to start converting your MP4 file to a closed caption file

Step 1

Sign up for a free Sonix trial account—includes 30 minutes of free MP4 to captions conversion.

Step 2: Upload your MP4 files from your computer, Google Drive, Dropbox, or by dragging it on the page.

Step 2

Upload the MPEG-4 Video File file(s) (*.MP4) from your computer, Dropbox, Google Drive, or by dragging it on the page.

Step 3: Select the language spoken in your MP4 file, then click 'Start Transcribing Now.'

Step 3

Choose the language spoken in the uploaded MP4 file. We support over 37 different languages including Russian, Chinese, Spanish, and English. Click the 'Start Transcribing Now' button.

Step 4: Sonix does all the work so grab a tasty cupcake. Our servers will extract the audio from your MP4 file and convert it to SRT.

Step 4

Sonix will then automatically transcribe the audio from your MP4 file and convert it to a simple text format. Grab a cupcake, it will take only a few minutes.

Step 5: Once your MP4 was converted to text, you might need to polish up the transcript. Now, you can easily do that with our AudioText Editor.

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: Download a SRT version of your MP4 file by clicking Export and selecting 'Subrip caption file (.srt).'

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 MP4 file. You can also adjust the character length and time duration length of each caption.

That's it! Your MP4 file has now been converted to closed captioning and is ready for the next step in your workflow!🎉

Thousands of incredible customers use SOnix to create closed captions from their MP4 files 💖

  • Google converts their MP4 video files to closed captions with Sonix
  • Microsoft converts their MP4 video files to closed captions with Sonix
  • NBC Universal converts their MP4 video files to closed captions with Sonix
  • ESPN converts their MP4 video files to closed captions with Sonix
  • Stanford University converts their MP4 video files to closed captions with Sonix
  • Yale University converts their MP4 video files to closed captions with Sonix
  • University of California in Los Angeles (UCLA) converts their MP4 video files to closed captions with Sonix
  • ABC News converts their MP4 video files to closed captions with Sonix
  • Quartz converts their MP4 video files to closed captions with Sonix
  • CNBC converts their MP4 video files to closed captions with Sonix
  • CIBC converts their MP4 video files to closed captions with Sonix

Convert MP4 video files to subtitle🎥

Frequently Asked Questions for MPEG-4 Video File (*.MP4)

What is a MP4 file?

An MP4 file is also known as a MPEG-4 Part 14 multimedia container. MP4 files were developed by the Moving Picture Experts Group (MPED). WIth an MP4 File, there are separate compression algorithms for the audio and video tracks. Typically, video is compressed with the MPEG-4 codec and the audio is compressed using the AAC codec (which is the same codec used in AAC files). Most MP4 files are downloaded from Apple’s iTunes STore since most of the media downloaded from the store is downloaded in this format. The MP4 format is also used for Internet streaming video.

Does Sonix transcribe video files with a *.MP4 file extension?

Yes, Sonix does automatically transcribe video files with a .MP4 file extension. Sonix is an online video to text converter. Convert any audio (mp3, m4a, wav, ...) or video (mp4, mov, avi, ...) file to text without installing any software! Sonix quickly and accurately transcribes *.MP4 files and converts them to text in a subtitle format.

Know anyone who needs to convert MPEG-4 Video File (.MP4) to subtitle?

We'd appreciate it if you tell them about Sonix—the best way to convert MP4 to subtitle.

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Create closed captions from your MPEG-4 Video File files with Sonix 🚀

Sonix transcribes your audio and video files in over 37 languages so they are easy to search, edit, and share. Sonix is an online, fully-automated speech to text service that quickly converts MPEG-4 Video File files to captions. Sign up today and start transcribing.

Fast, accurate automated transcription

Includes 30 minutes of free transcription

Transcribe and translate confidently knowing you’re backed by our award-winning team who is ready to answer your questions. You can also visit our Support Center for tips, articles, and videos.

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