Add subtitles to MP4 videos

Sonix automatically transcribes your MP4 video and lets you add professional subtitles with customizable styling.

Auto-transcribe
Custom styling
Burn-in option
Audio
Video
DOCX
SRT/VTT
PDF
53+ Languages
10x
Faster than real-time
Add subtitles to MP4 in minutes
99%
Accuracy rate
Industry-leading AI transcription
53+
Languages
Subtitles in any language
Custom
Styling
Fonts, colors, positioning
How It Works

Add subtitles to MP4 in 4 steps

Step 1

Upload video

Upload your MP4 video file to Sonix and select the language.

Step 2

Auto-transcribe

Sonix AI transcribes your video with word-level timestamps.

Step 3

Customize subtitles

Split subtitles, adjust timing, and customize fonts and colors.

Step 4

Export or burn-in

Download SRT/VTT files or burn subtitles directly into your video.

Common Questions

Everything about adding MP4 subtitles

Can Sonix add subtitles to MP4 videos?

Yes! Upload your MP4 video, and Sonix will transcribe it and let you add professional subtitles with customizable styling.

Can I burn subtitles into the video?

Yes! Sonix can permanently embed (burn-in) subtitles into your MP4 video with your choice of fonts, colors, and positioning.

What subtitle styles are available?

Customize fonts, colors, background boxes, positioning (top, center, bottom), and more for your burned-in subtitles.

Can I download subtitle files separately?

Yes! Export subtitles as SRT, VTT, or other formats to use with YouTube, Vimeo, or your video editor.

Can I translate subtitles to other languages?

Absolutely! Sonix can translate your subtitles into 54+ languages for multilingual videos.

How do I split subtitles correctly?

Sonix offers auto-split options for max characters per line, lines per caption, and max duration. Fine-tune manually if needed.

Why Sonix

The easiest way to add video subtitles

Auto-Transcribe

Upload your MP4 and get accurate subtitles automatically.

Custom Styling

Choose fonts, colors, and positioning for professional results.

Burn-in Option

Permanently embed subtitles into your video with one click.

Translate

Create subtitles in 53+ languages from your original video.

Reviews

Trusted by video creators

4.98 rating from 211 reviews

I have been a dialogue system researcher for half a decade now. I had build my own app for doing the transcriptions. Sonix was clearly better than what I had. I made the switch!
RM
Ramesh M.
Portland, OR USA
It was super easy, affordable, and accurate!
AL
Allison L.
Ellsworth, WI, USA
It really accelerated my work and I was amazed by the accuracy, especially given that the video featured only non-native speakers.
MC
Martin C.
Nottingham, United Kingdom
Surprisingly accurate transcription across a number of European accents (Yorkshire, Scottish, Oxford, Italian!)
PD
Philip D.
Garstang, United Kingdom
My transcript work flow is so fast now. It takes me half the time it used to. So glad i found you :)
SG
Shimrit G.
Tel Aviv, Israel
I've used other platforms that don't do a good job at all. Sonix was close to perfect!
TP
Tamara P.
Riverside, CA, USA
Get Started

Add subtitles to MP4 now

Try Sonix free with 30 minutes of transcription. No credit card required.

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AI transcription and translation in 53+ languages.

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