Convert MP4 to SRT

Generate perfectly-timed SRT subtitle files from your MP4 videos. Create professional subtitles ready for YouTube, Vimeo, social media, or video editing software.

Timestamped
5-min turnaround
All platforms
Audio
Video
DOCX
SRT/VTT
PDF
53+ Languages
About This Format

Understanding MP4 files

What is a MP4 file?

Universal video standard for web, mobile, and streaming

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.

Common Uses

  • YouTube videos
  • Social media content
  • Video streaming
  • Mobile video playback
  • Video editing

Audio Quality

Industry standard with excellent audio/video quality

Transcription Tips for MP4

  • Most common video format - excellent Sonix support
  • AAC audio track provides great transcription accuracy
  • Works with all resolution from 480p to 4K
  • Screen recordings in MP4 transcribe well

Where MP4 Files Come From

  • YouTube downloads
  • Smartphone cameras
  • Screen recorders
  • Video editors
  • Streaming services
10x
Faster than real-time
Get your MP4 SRT in minutes
99%
Accuracy rate
Industry-leading AI for MP4 files
53+
Languages
Subtitles in any language
30+
Export formats
SRT, VTT, text, and more
How It Works

Convert MP4 to SRT in 6 steps

Step 1

Create account

Sign up for Sonix's free trial. Includes 30 minutes free.

Step 2

Upload file

Upload your MP4 file from your computer or cloud storage.

Step 3

Select language

Choose from 53+ languages spoken in your file.

Step 4

Auto-transcribe

Sonix AI transcribes and timestamps your MP4 audio.

Step 5

Edit subtitles

Fine-tune subtitle timing and text with our editor.

Step 6

Export SRT

Download your MP4 subtitles as an SRT file.

Common Questions

Everything about MP4 to SRT

Can I create SRT subtitles from an MP4 video?

Yes! Upload your MP4, Sonix transcribes the audio with word-level timestamps, then export to SRT format. Subtitles sync perfectly with your video for any platform.

How accurate are MP4-to-SRT subtitle timings?

Sonix generates word-level timestamps from MP4 audio tracks with precision within a few hundred milliseconds. Fine-tune any timing in our editor before exporting.

Can I upload MP4 SRT subtitles to YouTube?

Absolutely! SRT files from Sonix work perfectly with YouTube, Vimeo, Facebook, LinkedIn, and all major video platforms. Upload the .srt file to your video's caption settings.

How do I add SRT subtitles back to my MP4?

Use video editing software like Premiere, Final Cut, or free tools like HandBrake to mux the SRT file with your MP4. This embeds subtitles that viewers can toggle on/off.

Can I include speaker labels in MP4 SRT subtitles?

Yes! Enable speaker detection when exporting to SRT. Perfect for interviews, podcasts, meetings, and multi-speaker video content.

How do I edit MP4 subtitle timing?

Use Sonix's visual editor to adjust timing by dragging subtitle boundaries. The waveform display shows audio for precise synchronization.

Why Sonix

Perfect SRT subtitles from MP4 files

Precise Timestamps

Word-level timing ensures your subtitles sync perfectly with the audio.

Universal Format

SRT works with YouTube, Vimeo, Facebook, and all major video platforms.

Customizable

Adjust timing, line length, and caption duration to your needs.

Editor Friendly

Import directly into Final Cut Pro, Premiere, DaVinci Resolve, and more.

Related

More ways to convert MP4 files

Other MP4 conversions

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Other file formats

MPG to text
OGX to text
MOOV to text
M4V to text
MPEG to text
OGV to text
VOB to text
MK3D to text
MPE to text
RM to text
See all supported file formats
Reviews

Trusted by video creators

4.98 rating from 211 reviews

I was especially impressed with the quality when it comes to other accents as most other companies can only give a good machine transcript if it is a US accent. Sonix is amazing and I have nothing but good things to say. Thank you for providing this service!
PS
Preethi S.
Hyderabad, India
I LOVE Sonix. It's saving my life. I'm working on a project with almost NO budget, interviewing a bunch of people and the Sonix transcriptions are accurate, and are so easy and intuitive to correct.
NS
Nelson S.
Brooklyn, NY USA
I have absolute admiration for the impressive transcription done to 3 short YouTube videos. It is truly amazing how accurately it recorded the correct words and so well paragraphed...
WN
Werner N.
Auckland, New Zealand
So fast, so easy. This has saved me hours for every 20 minutes of recording.
WS
Wendy S.
Danvers, MA USA
I tried Sonix, and it’s amazing! Seriously, I think that you will revolutionize journalism.
CB
Caroline B.
Denver, CO USA
I had been using Dragon voice recognition software, but Sonix eliminates that step all together. I absolutely love Sonix.
JA
Judith A.
Ireland
Content is still king. Google can’t crawl audio from webinars and videos. Getting that content transcribed with Sonix is an absolute must if you want to drive more leads to your web site.
VS
Val S.
San Francisco, CA USA
The level of accuracy and your UI is quite amazing. It allowed me to try the product without having to learn anything new, I was so happy about it I sent the results to a couple of...
GG
Ghislaine G.
Madrid, Spain
Read more testimonials
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Create MP4 subtitles now

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AI transcription and translation in 53+ languages.

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