Thousands of incredible customers trust Sonix to add subtitles to their M4V files 
How do I easily add subtitles to my M4V files? 
Easily add subtitles to M4V files in four simple steps:
Upload your M4V file to Sonix
Log into Sonix and upload the M4V file, make sure to select the language that was spoken and then click the “Transcribe” button. If you do not have an account with Sonix, just create one here.Polish the transcript of your M4V file
We use cutting-edge audio transcription to transcribe your M4V file. Spend a few minutes cleaning up your transcript in our user-friendly transcript editor. You can also translate your transcript to over 30 different languages for an additional charge.Split your subtitles in the editor
Powerful subtitle splitting options await you. Set the number of lines per caption, the max number of characters per line, or the max time duration of each caption, and we'll break down your transcript for you. See each caption in our timeline and over the video.Export subtitles for your M4V file
Download SRT and VTT subtitle files of your M4V file. Then, incorporate them into your video production workflow. Or, if they look good already, you can burn-in the subtitles directly to your M4V file within Sonix for an additional charge.
That's it! You can download a new M4V file with the subtitles burned in, or SRT/VTT subtitle files in a matter of minutes. It's a brand new online workflow that makes your life 10x easier.
Please feel free to reach out to us for any other questions on how to add subtitles to your M4V files.
Frequently asked questions about adding subtitles to M4V files with Sonix
Can Sonix automatically split the subtitles from my M4V file for me?
Yes! After transcribing your M4V file, Sonix has very granular and powerful subtitle splitting options:
- Number of lines for your subtitle: 1-3 lines
- Number of characters per line: 45-90 characters
- Duration of each subtitle: 0.1s to 10s
We will split the subtitles for you and all you have to do is a bit of fine tuning before exporting or burning-in your subtitles.
Can I download the subtitles from my M4V file in either SRT or VTT?
Yes! You absolutely can split your transcript into captions and export them in SRT and VTT file formats. Now, you can easily bring these subtitle files into your workflow or make your M4V videos more accessible when you upload them to the Internet.
Can Sonix burn the subtitles into my M4V video for me?
Yes! Sonix is powerful enough to burn the subtitles into your M4V file. In the editor, simply select “Burn-in” from the Subtitles menu after you split and customize the look and feel of the subtitles. You don't need any other software, just Sonix.
Other ways to convert your M4V video files with Sonix 
M4V to text
Use the most accurate speech-to-text technology to convert files: M4V to text.
M4V to docx
Accurately transcribe your M4V file to Microsoft Word Format (docx) so you can bring the transcript into your workflow.
M4V to PDF
Easily transcribe your M4V file to Adobe's Portable Document Format (pdf) so you can share them with colleagues.
M4V to srt
Quickly create subtitles from your M4V files and save them as SRTs, one of the most widely supported subtitle formats.
M4V to VTT
Create more advanced captions for your M4V files by using the latest caption format VTT (Video Text Tracks).
M4V to captions
Quickly and easily create closed captions for your M4V files so you can embed them in your video files.
Add subtitles to M4V files
Quickly and easily add subtitles to your MP4 video files with the power of automated transcription.
Add accurate subtitles to your M4V file 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, automated speech-to-text service that accurately creates and adds subtitles to your M4V file. Sonix converts audio to text quickly, accurately, and easily. Fast, accurate, and affordable. Millions of users from all over the world.
Includes 30 minutes of free transcription
