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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Home » Supported filetypes » Video filetypes » MP4 to captions

How do I accurately convert my MP4 files to closed captions? 📋

Sonix uses the latest automated transcription technology to convert your video files (*.mp4) to closed captions. Follow these six steps and see how magical it is:

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 38 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 customers create closed captions from their MP4 files with Sonix 💖

  • 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
  • Princeton University converts their MP4 video files to closed captions with Sonix

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

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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Other ways to convert your MP4 video files with Sonix 🎥

MP4 to text

Use the most accurate speech-to-text technology to convert files: MP4 to text.

MP4 to docx

Accurately transcribe your MP4 file to Microsoft Word Format (docx) so you can bring the transcript into your workflow.

MP4 to PDF

Easily transcribe your MP4 file to Adobe's Portable Document Format (pdf) so you can share them with colleagues.

MP4 to subtitles

Create subtitles for your MP4 files to make them more accessible for your audience.

MP4 to srt

Quickly create subtitles from your MP4 files and save them as SRTs, one of the most widely supported subtitle formats.

MP4 to VTT

Create more advanced captions for your MP4 files by using the latest caption format VTT (Video Text Tracks).

Add subtitles to MP4 files

Quickly and easily add subtitles to your MP4 video files with the power of automated transcription.

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

Sonix automatically transcribes and translates your audio/video files in 38+ languages. Easily search, edit, and share your media files. Sonix is an online, fully-automated speech to text service that quickly converts MPEG-4 Video File files to captions. Fast, accurate, and affordable. Millions of users from all over the world.

Fast, accurate automated transcription

Includes 30 minutes of free transcription

Let our support team help you with all of your automated transcription questions. Pictured: Christine Lee

Transcribe and translate confidently, knowing you’re backed by our award-winning team, who is ready to answer your questions. Get immediate help by visiting our Help Center, resources, tutorials, and Introduction to Sonix videos.

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