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How to Free Convert MP4 Video Files to MKV

You never lack ways to convert MP4 to MKV format. Video converter software, some media players, and web-based tools can do it in just a couple of steps. But a desktop video converter program is preferred for its fastest MP4 to MKV conversion speed and great output quality. If you want to convert MP4 videos to MKV format, you need to use one of the following ways. Here's a detailed guide.

Way 1. Use WinX HD Video Converter Deluxe

GPU hardware acceleration makes WinX HD Video Converter Deluxe process MP4 to MKV conversion with at least 5x faster speed than other tools do. High Quality Engine promises nearly original quality output. With hundreds of A/V codecs and built-in Website Video Downloader and video editor, can also help you transcode between HD video formats like convert AVCHD M2TS to MKV, HEVC to H.264, MOV to WMV, as well as compress HD video file and convert standard videos on Windows 10. Moreover, it is embedded with 420+ profile settings for Apple, Microsoft, HDTVs, Android phones and tablets.

How to Convert MP4 to MKV with WinX HD Video Converter Deluxe?

WinX HD Video Converter Deluxe is available for Windows 10/8/7 and macOS Big Sur or eariler. Tiny file size allows users easily and fast get it installed and launched. After a brief installation, the main interface will pop up spontaneously.

Step 1: Firstly you can import your target MP4 video into WinX HD Video Converter Deluxe by clickingthe Add Video File icon at the top. And as for these videos you do no need to convert or have converted already, the Clear button will clear them out of the file list window. Besides, freely selectable language tracks give you plenty options to convert video with prefered language track.

Step 2: And then, Output Profile, choose the output format profile and click the "OK" button. Here we would choose to convert MP4 to MKV, so slightly choose MKV HD Video (h264) under HD Video categary. WinX HD Video Converter Deluxe also furnishes several other categary, such as to DVD, to HD Video, to Apple, to Sony, to MicroSoft, to Portable and to Music.

Convert MP4 to MKV)

Step 3: In the parameter setting area, all the parameter is freely adjustable, like Audio/Video Quality, Audio sample rate, Video frame rate, Output image setting, video resolution and Audio/Video codec. You can customize these data to achieve the best quality you prefered.

Step 4: After the presetting of the above procedure, the next step is to click the Run button, and conversion process will indicate in the conversion dialog box. Two options available for users when the video converting process finished: Shut down computer when conversion completed or Open output folder when conversion completed.

Related: How to Convert MKV Video Files to MP4 Format

Way 2. Convert MP4 to MKV with VLC Media Player

The popular media player VLC Media Player can work as a simple video converter. If you have VLC installed on your computer, use the steps below to try transcoding MP4 video files to MKV format with VLC media player.

  1. Open VLC Media Player on your computer, click the Media tab at the top menu bar, and select Convert/Save.
  2. On the Open Media window, click "Add" and choose the source MP4 video you want to convert to MKV, and open the video file. Click "Convert/Save" to continue.
  3. On the Convert window, click the wrench icon to the right of the Profile list to show more format options. Select MKV.
  4. Click "Browse" and select a location and filename for the converted MP4 video file.
  5. Click the "Start" button to start MP4 to MKV conversion with VLC.
Convert MP4 to MKV VLC

Way 3. Convert MP4 to MKV using FFmpeg

If you have an MP4 video file and want to convert it into MKV format. Try FFmpeg, an open-source program. Use the following command to convert MP4 format to MKV.

Ffmpeg - input.mp4 output.mkv

The command inputs a MP4 video named input.mp4 and transcoded into an MKV file named output.mkv. It means converting MP4 video stream into MKV video stream with MKV container. The process may result in the same video and audio codecs as input.mp4, only the container format is changed from MP4 to MKV. It's a pity for those users who want to convert codec format. The conversion process can be accelerated by forcing a preset but it would cause video quality loss.

Convert MP4 to MKV FFmpeg

Way 4. Convert MP4 to MKV Free Online (Max 100-200MB)

If you have an MP4 video file smaller than 200MB and you want to convert it to MKV format, online video converting services are worth trying. It's free though limited, requiring no third-party plugins or programs. However, such online tools have ads and endless redirects. This way is only suitable for occasional small video conversion.

The top-rated online video converter for MP4 to MKV transcoding are CloudConvert, FreeConvert, and ConverFiles. You can choose any of them and go to their MP4 to MKV conversion page, choose source MP4 video file to upload, choose to MKV, start MP4 to MKV conversion, and download converted MKV video files.

Convert MP4 to MKV Free Online

Suggested reading: more online MP4 video converters >>


Author - Kistent Waung

Kistent Waung twitter icon

Graduated from Nanyang Technological University, Singapore, she employs herself in IT related content creation (since 2013) and happens to perfectly combine her major (computer & science) and her gusto (writing). She's seasoned at offering video audio conversion workarounds and always passionate about new trends, from hot HEVC, 4K to the new AV1 codec.

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