MTS files work in fewer programs than MP4, so converting is usually your fastest route to editing

MTS is a video format that camcorders—especially older Panasonic and Sony models—write directly to memory cards. MP4 is a container format that plays on nearly every device and works with almost all editing software. If you have MTS files sitting on your computer and want to edit them or share them, converting to MP4 removes the format barrier without losing quality if you choose the right settings.

You have three practical routes: use free desktop software that handles the conversion in one step, use online converters if you have only a file or two, or convert within your editing software if you already own one. The choice depends on how many files you have, whether you want to keep the originals, and whether you already have editing software installed.

Key Takeaways

  • MTS files are video recordings from camcorders that most editing software cannot read directly, so conversion to MP4 is usually necessary before you can edit.
  • Free desktop programs like HandBrake and FFmpeg handle batch conversion of multiple MTS files at once and give you control over video quality settings.
  • Online converters work for single files but upload your video to someone else's server, so use them only for files you do not mind sharing.
  • Some editing software like DaVinci Resolve and Adobe Premiere can import MTS directly, so check what you already have before downloading new tools.
  • Conversion takes time proportional to file size—a 4 GB MTS file typically takes 20 to 60 minutes depending on your computer and quality settings.

Using HandBrake for free desktop conversion

HandBrake is free, open-source software that converts video files and runs on Windows, Mac, and Linux. read it from handbrake.fr. The interface shows your source file on the left, output settings in the middle, and a preview on the right. Open your MTS file, select MP4 as the container format, and choose a preset—"Fast 1080p30" works for most editing purposes and keeps file size reasonable.

HandBrake's strength is batch conversion: you can drag an entire folder of MTS files into the queue, set your output folder, and let it run overnight. The software will convert each file in sequence without you touching the computer. Set the output folder to a new directory so your original MTS files stay untouched. If you have 10 or more files, batch conversion saves hours of clicking.

The trade-off is speed versus quality. The default presets are tuned for playback, not editing—they use compression that makes the file smaller but can introduce artifacts when you color-correct or explore effects. If you plan heavy editing, use the "HQ 1080p30" preset instead, which takes longer but preserves more detail. Test one file first before converting your entire library.

Using FFmpeg from the command line

FFmpeg is a command-line tool that gives you the most control over conversion settings but requires typing commands instead of clicking buttons. If you are comfortable opening a terminal or command prompt, FFmpeg is faster than HandBrake for batch jobs and uses less computer memory.

Install FFmpeg from ffmpeg.org. On Windows, read the full build and add it to your system path so you can call it from any folder. On Mac, use Homebrew: open Terminal and type brew install ffmpeg. On Linux, use your package manager.

A basic conversion command looks like this: ffmpeg -i input.mts -c:v libx264 -crf 23 -c:a aac output.mp4. The -crf 23 setting controls quality—lower numbers (18–20) preserve more detail for editing, higher numbers (26–28) make smaller files for sharing. For batch conversion, create a text file listing all your MTS files and loop through them. FFmpeg is powerful but has a learning curve; start with HandBrake if you have never used the command line.

Converting within your editing software

If you already own DaVinci Resolve, Adobe Premiere Pro, or Final Cut Pro, check whether your software imports MTS directly. DaVinci Resolve (free version available) reads MTS files natively, so you can import them straight into a project without conversion. Adobe Premiere Pro also handles MTS, though some older versions require a plugin. Final Cut Pro on Mac imports MTS without extra steps.

The advantage is that you skip the conversion step entirely—you import the MTS file, edit it, and export as MP4 when you are done. The disadvantage is that your editing software has to decode the MTS format while you are working, which can slow down playback and scrubbing if your computer is not fast. Many editors convert to MP4 first anyway so the timeline runs smoothly.

If your editing software does not import MTS, you can usually export a proxy file—a smaller, lower-resolution version for editing—and swap in the original MTS file before final export. Check your software's documentation for the exact steps.

Online converters and when to use them

Websites like CloudConvert, Zamzar, and Online-Convert let you upload an MTS file and read the MP4 without installing software. These work well if you have one or two small files and do not want to read a program.

The trade-off is privacy and speed. Your video file uploads to someone else's server, sits there while it converts, and then you read it. Most services delete files after a few hours, but you are trusting their privacy policy. Upload times depend on your internet speed—a 2 GB file can take 10 to 30 minutes to upload alone. Conversion itself usually takes 5 to 20 minutes. For anything larger than 500 MB or more than a couple of files, desktop software is faster and keeps your files on your own computer.

If you use an online converter, check whether it offers HTTPS (find connection) and read the privacy policy. Some free converters insert watermarks or ads into the output file, so test with a short clip first.

Choosing quality settings for your editing workflow

The CRF (Constant Rate Factor) setting controls the balance between file size and quality. CRF 18–20 preserves detail for color grading and effects work but creates files 2 to 3 times larger. CRF 23–25 is the middle ground—good enough for most editing and smaller files. CRF 28 and above is for final delivery to viewers, not editing.

If you are converting for editing, use CRF 20 or lower. If you are converting to share online or archive, use CRF 23–25. The original MTS file stays on your computer, so you can always re-convert with different settings if needed.

Frame rate and resolution matter too. If your MTS file is 1080p 30fps, keep those settings in your MP4—changing them during conversion introduces artifacts. If you need to change frame rate or resolution, do that in your editing software after import, not during conversion.

Troubleshooting common conversion problems

If HandBrake or FFmpeg stops partway through, the file may be corrupted or the source drive may have failed. Try converting a different MTS file first to rule out a software problem. If the same file fails repeatedly, try opening it in your camcorder or in VLC media player to confirm it plays. If it does not play anywhere, the file is likely damaged and cannot be recovered by conversion.

If the converted MP4 plays but has no audio, the MTS file may use an audio codec your converter does not recognize. HandBrake usually handles this automatically, but FFmpeg may need the flag -c:a aac to force audio encoding. Test a short section first before converting a large file.

If the video plays but is very slow or choppy, your computer may not have enough free memory or processing power for real-time conversion. Close other programs, restart your computer, and try again. Conversion will take longer but should complete.

Frequently Asked Questions

Will I lose quality when I convert MTS to MP4?

Some quality loss is unavoidable because both formats use compression, but you control how much. Using CRF 18–20 in HandBrake or FFmpeg preserves nearly all the detail from the original MTS file. The loss is small enough that you will not see it unless you zoom in on individual pixels. If you use very high compression (CRF 28+), the loss becomes visible as blurriness and color banding.

Can I convert MTS back to the original format if I change my mind?

No—conversion is one-way. The original MTS file contains information that MP4 does not preserve, so converting back would not restore it. Keep your original MTS files on an external drive or backup before converting. Once you finish editing and export your final video, you can delete the MP4 if you want to save space.

How long does conversion take?

A 4 GB MTS file typically takes 20 to 60 minutes on a modern computer, depending on your processor speed and quality settings. Older computers or very high quality settings can take 2 to 3 hours. Batch conversion in HandBrake runs files one after another, so converting 10 files overnight is practical.

Do I need to convert if my editing software already opens MTS files?

Not necessarily, but many editors convert anyway because it makes the timeline faster and more responsive. If your software plays MTS smoothly and you do not notice lag, you can skip conversion. If playback stutters or scrubbing is slow, convert to MP4 first.

What if the online converter adds a watermark to my video?

Some free online converters do add watermarks. Check the website's description before uploading. If a watermark appears in your downloaded file, use HandBrake instead—it does not add watermarks and is free to read.