Convert MTS to subtitles

Sonix transcribes your MTS file and creates timestamped subtitles in SRT, VTT, and other formats.

Free to start — no credit card required.See pricing

SRT & VTT
5-min turnaround
All platforms
MTS conversion guide

Create subtitles from MTS in 6 steps

  1. 1
    Create account~30 sec

    Sign up for a free Sonix trial with 30 free minutes.

  2. 2
    Upload file~1 min

    Upload your MTS file from your computer or cloud storage.

    44+ formats supported
  3. 3
    Select language~10 sec

    Select the language spoken in your file.

    54+ languages
  4. 4
    Auto-transcribe~5 min

    Sonix AI transcribes your MTS with word-level timestamps.

  5. 5
    Split subtitles~2 min

    Customize line length, duration, and subtitle breaks.

  6. 6
    Export~10 sec

    Download your subtitles as SRT or VTT files.

    30+ export formats
The MTS file format

Understanding MTS files

What is a MTS file?

HD camcorder video format (AVCHD)

MTS files are also Advanced Video Codec High Definition (AVCHD) video files that contain high definition MPEG videos that have been captured by certain models of video camcorders. Originally designed by Sony and Panasonic for their High Definition camcorders, JVC, Sanyo, and Canon camcorders also now record audio and video in the MTS file format. Typically MTS videos have high definition streams and support both 720p and 1080i HD videos.

Common uses for MTS files

  • HD camcorder recordings
  • Consumer video production
  • Event videography
  • Sony camcorders
  • Panasonic camcorders
  • Canon camcorders
  • JVC camcorders

Who works with MTS files?

Documentary filmmakers, local news crews, and families digitizing home videos often have large archives of MTS footage from AVCHD camcorders that were common between roughly 2008 and 2015. Video editors also encounter MTS files when ingesting camcorder SD cards into tools like Adobe Premiere Pro or Final Cut Pro, where the files sit inside the AVCHD folder structure.

MTS vs MP4: which should you use?

MTS wraps H.264 video in an MPEG-2 transport stream, a structure designed for in-camera recording and broadcast-style error resilience, while MP4 uses the MPEG-4 Part 14 container with much broader software and device support. Because both formats commonly carry H.264 video, MTS footage can often be remuxed to MP4 without re-encoding or quality loss. MTS is what you get straight off an AVCHD camcorder; MP4 is the better choice for editing, sharing, and playback on modern devices.

Convert MP4 to text
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Get your MTS subtitles in minutes
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Accuracy rate
Industry-leading AI for MTS files
53+
Languages
Subtitles in any language
30+
Export formats
SRT, VTT, FCPXML, and more
MTS conversion FAQ

MTS subtitles: frequently asked questions

Can you create subtitles from MTS files?

Yes! Sonix transcribes your MTS file with word-level timestamps and creates professional subtitles in SRT, VTT, and other formats.

What subtitle formats are supported?

Export subtitles as SRT (most universal), VTT (web video), FCPXML (Final Cut Pro), and many more formats.

Can I customize subtitle timing?

Yes! Adjust max characters per line, lines per caption, max duration, and manually fine-tune any timing.

How do I add subtitles to my video?

Upload the SRT/VTT file to YouTube, Vimeo, or import into your video editor. You can also burn subtitles directly into the video.

Can I translate subtitles?

Yes! Sonix can translate your subtitles into 55+ languages, making your content accessible globally.

Are the subtitles accurate?

Sonix achieves up to 99% accuracy. Use our editor to make any corrections before exporting.

Why won't my MTS file play on my computer?

MTS files use the AVCHD transport-stream structure, which some default media players do not support, and clips copied out of the camcorder's AVCHD folder can lose playback context. Opening the file in VLC or remuxing it to MP4 usually resolves the issue.

Do I need to convert MTS to MP4 before transcribing?

No. You can upload the MTS file directly, and its audio track is extracted and transcribed the same way as an MP4 upload.

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