Convert MKV to MP4 for Free - No Limit [Offline & Online Methods]

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Free MKV to MP4 Converter No Limit for Windows

Free MKV to MP4 Converter No Limit for Mac

Convert MKV to MP4 Online Free No Limit

More Conversion Tips:

- Convert OBS MKV to MP4

- FFmpeg MKV to MP4 Command Line

Bottom Line

FAQs

There are many MKV converters available on the market. If you're looking for a free video converter with no restrictions on file size or length, and completely watermark-free, then you've come to the right place.

Here, I will introduce truly free and unrestricted MKV to MP4 converters to help you easily complete the format conversion. Plus, if you have an MKV recording from OBS or prefer a command-line solution, I also have some useful tips to share. Without further ado, let's dive right in!

Free MKV to MP4 Converter No Limit for Windows

WonderFox Free HD Video Converter Factory offers Windows users a perfect solution for video conversion. Thanks to its excellent format support, you can use it to convert basically any video you want. It also supports high-resolution videos, so you can convert 4K MKV to MP4. Meanwhile, you can import multiple files and convert them all to the same settings at once.

The software is suitable for all users. It has a self-explanatory interface where you can complete format conversions in just a few clicks. If you want, you can further adjust video parameters, edit the video, and select which udio and subtitle tracks to keep before conversion.

Now, download download this tool and see how to use it to convert MKV to MP4 with no limit on Windows.

Step 1: Add Your MKV Files to the Converter

Launch Free HD Video Converter Factory and open Converter. Click Add Files in the top left, select your MKV files and import them into the program. You can also drag and drop them to the window.

Step 2: Choose MP4 as the Output Format

Expand the output format list on the right side, then select MP4 under the Video category.

Alternatively, if you wish to use a specific encoder, you can select H264 or H265 for MP4. You may also directly choose a device preset to ensure the files are compatible with your specific device.

💡 H264 and H265 are codecs used to compress video inside the MP4 container. You can use H264 if you want to ensure that your videos play smoothly on most devices, or choose H265 if you wish to store your videos more efficiently.

Optional: Adjust Parameters, Keep Subtitle/Audio Tracks, and Edit Videos

You can fine-tune the output settings to convert MKV to MP4 with the desired results. Simply open Parameter settings and customize the encoder, bitrate, frame rate, resolution, aspect ratio, and volume as needed. For example, if your MKV has an audio stream that’s not supported by your device, you can change the audio encoder to AAC to fix the issue.

As MKV can contain multiple subtitle and audio tracks, you can also keep the desired subtitles and audio streams before conversion. Unfold the Subtitle or Audio Track dropdown menu to select your preferred tracks. You can even add external subtitle files and audio to the existing video if needed.

Additionally, you can use the editing tools below the imported video to trim, rotate, crop, apply filters, and add watermark to protect your video. When multiple files are imported, you can use the Merge tool to combine them into a single file if you want.

Step 4: Start Converting MKV to MP4 with No Limit

Click the ▼ icon on the bottom to specify a destination folder, then click Run to start the conversion.

🔔 WonderFox Free HD Video Converter Factory Pro does not have a very impressive conversion speed, as it converts videos by re-encoding, so the process can be time-consuming. If you want to improve the conversion speed, you can upgrade to its Pro version, which supports hardware acceleration that can leverage your GPU to boost H264 and HEVC encoding speeds by up to 30 times. Furthermore, the Pro version features an exclusive Lightning Mode that can help you remux MKV to MP4 at the fastest speed and without losing quality.

Free MKV to MP4 Converter No Limit for Mac

Note that WonderFox Free HD Video Converter Factory is compatible only with Windows. To convert MKV to MP4 on a Mac computer, use HandBrake.

This is a free, open source, and cross-platform video converter that can handle various video files, with support for outputting to MP4, MKV, and WebM. Not only does it support MKV files and offer various MP4 presets, but it also allows users to fine-tune video parameters according to specific needs.

Keep in mind that HandBrake is a video transcoder, so its conversion speed is relatively slow, and this is particularly obvious when converting longer MKV videos to MP4. Its interface is packed with a lot of buttons, so it may feel slightly complex when you are using it for the first time. But don’t worry. By following the steps below, you can use HandBrake to convert MKV to MP4 on your Mac with no limit.

🗨️ HandBrake is also available for Windows, but I still recommend WonderFox Free HD Video Converter for its simpler design and more export options.

Step 1: Download HandBrake from https://handbrake.fr/ and install it on your Mac.

Step 2: Open HandBrake, you’ll see an import window. Select your MKV file and click Open to import it.

Step 3: Click the Preset drop-down to select your desired profile. For instance, you can select a profile that matches your source video’s settings. In the Summary tab, you’ll see the output format is defaulted to MP4 with H264 video and AAC audio, so leave it as it is.
Optional: You can explore other tabs to modify the settings as you see fit.

💡 You can open the Video tab and drag the Constant Quality slide bar to the right to set a lower RF value. The lower the RF value is, the higher quality the converted video will be, yet the bigger the file size you will get. Quality scale ranging from 18RF to 23 RF is considered good.

Step 4: Click Browse at the bottom to choose an output folder, and rename the file if needed.

Step 5: Finally, click Start to begin the conversion process. You’ll see a progress bar at the bottom. Once it completes, you can view the converted MP4 file in the output folder you just set.

Free MKV to MP4 Converter No Limit for Mac

Convert MKV to MP4 Online Free No Limit

Online video converters are incredibly convenient as you’re allowed to complete file conversions directly in your web browser, without the need to download any software or plugins. However, it’s a quite a challenge to find a free MKV to MP4 online converter with no file size limit, since most online tools only allow you to convert videos up to 200MB for free. The good news is that, after hours of searching across the web, I have finally discovered this online tool called Converter App that can be considered a legit free MKV to MP4 online converter with no limit.

I successfully uploaded a 3GB MKV file to the site and converted it to MP4 with no limit on size and length. Best of all, no account registration is required to use it. The downside, however, is that if you’re uploading large files, the wait time for the upload to complete can be very long.

Anyway, I’ll recommend it for occasional use, as it’s genuinely convenient and easy to use. Next, I’ll walk you through how to convert MKV to MP4 online free no limit.

Step 1: Visit it here: https://converter.app/mkv-to-mp4/.

Step 2: Select the MKV video you want to convert and drag it to the dashed rectangle box. Or, you can hit the words “Click to choose a file” to import the target file.

Step 3: Click on the Expert Settings to customize codec options. You can select a new codec from the drop-down options of the Video Codec and Audio Codec.

Step 4: The conversion process starts automatically. When it’s done, hit the Download button to save the converted MKV video file.

💡 If the file you need to convert is relatively small, you might also consider trying 123apps (https://video-converter.com/), which allows for a maximum file size of 500MB, or FreeConvert (https://www.freeconvert.com/mkv-converter), which supports files up to 1GB. The smaller the file, the less time it will take to upload and convert.

More Conversion Tips:

- Convert OBS MKV to MP4

If you’ve recorded an MKV file in OBS, instead of using another video converter, you can directly remux the MKV recording to MP4 format using its built-in MKV remuxer. Here is how:

Step 1: Run OBS and click File on the top menu bar, then select the Remux Recordings option.
Step 2: Add the MKV recording to the interface by clicking the three-dotted button under the OBS Recording section.
Step 3: Click the three-dotted button under the Target File to select an output path and rename the recording.
Step 4. Press Remux to start the process.

- FFmpeg MKV to MP4 Command Line

FFmpeg offers a powerful way to convert MKV to MP4 without limitations. It allows fast video remuxing and multithreading, but the process is command-line-based, so it won’t be easy for beginners. Once you’ve configured FFmpeg on your system, you can run this simple command to convert the MKV format to MP4:

ffmpeg -i input.mkv output.mp4

It’s worth noting that FFmpeg provides the best flexibility to help you convert files to your liking. For instance, if you want to convert MKV to MP4 with multiple audio tracks, you can use this command:

ffmpeg -i input.mkv -vcodec copy -acodec copy -map 0 output.mp4

To change the container only without transcoding, use this command:

ffmpeg -i input.mkv -c copy output.mp4

Bottom Line

With the tools above, you are able to convert MKV to MP4 for free and without any limitations. But free tools not without their drawbacks. They usually have lengthy processing time due to their basic conversion capabilities.

If you want to accelerate the process, or want to convert MKV to MP4 losslessly, I recommend trying the Pro version of WonderFox Free HD Video Converter Factory. It comes with many more useful features worth exploring, and you can download it right below: