Convert MP4 to MKV Files Online for Free.
Free online tool to convert mp4 to mkv files quickly and securely. No installation required – start converting your files in just a few clicks!
Drag and drop your files here or click to upload.
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Maximum file size is 10MB
How It Works
How to Convert MP4 to MKV
Click inside the file drop area to upload your MP4 file or drag & drop it.
Select MKV as the output format and click the 'Convert' button.
Download the converted MKV file instantly after conversion.
You can also send a link to the converted file via email. (Optional)
Convert Your MP4 files to other formats
RunConvert.com can convert your MP4 files to these other formats:
Convert Your MP4 files to other formats
Convert Files to MP4 Format
RunConvert.com supports these converters to MP4 format:
Convert Files to MP4 Format
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Frequently Asked Questions
Here are some common questions and answers about mp4 file conversions ask by our users on RunConvert.com.
Frequently Asked Questions
Q: What do I do if my image doesn’t look right after conversion?
A: If your image looks off, it might be due to the limitations of the format you chose. You can try a different format or tweak settings like resolution or compression before converting again. We're happy to help if you need troubleshooting!
Q: Can I convert vector images to raster formats?
A: Yes, you can convert vector images like SVG to raster formats like PNG or JPEG. This is handy when you want to make a vector image suitable for web use or for sharing on social media.
Q: Can I convert an image to PDF?
A: Yes! You can easily convert images to PDF. Just upload your image, select the PDF format, and your image will be part of a clean, easy-to-share PDF document.
Q: How fast is the image conversion process?
A: The speed of conversion depends on the file size, format, and our current server load. However, for most standard images, conversion happens within seconds. Larger files may take a bit longer, but you’ll always know the progress.
Q: How do I convert a screenshot to a different format?
A: Converting a screenshot is just as easy as any other image! Upload your screenshot in its current format (like PNG or JPEG) and choose the output format you want, whether that's a different image format or even a PDF or Word document.
Q: How do I convert a transparent PNG to a JPG?
A: Since JPGs don’t support transparency, the transparent parts of a PNG will turn white or black in the converted image. If you need transparency, consider staying with PNG or switching to formats like WebP.
Q: Can I convert a photo into a 3D image?
A: Unfortunately, we don’t support 3D image conversion at this time. However, you can explore other software that specializes in 3D rendering if that’s what you need.
Q: Can I convert images for use in social media posts?
A: Definitely! RunConvert can resize and convert images to the perfect formats for social media posts. Whether you need square images for Instagram or landscape images for Facebook, we can help make sure your images are optimized for sharing.
Q: Do you offer any image optimization features?
A: Yes! We offer basic image compression to help reduce file size, making it easier to upload and share your images online without losing much quality.
Q: How long will it take to convert my images?
A: Typically, image conversion is super fast! It can take anywhere from a few seconds to a couple of minutes depending on the size and complexity of the image. Larger or more intricate files may take longer, but you’ll always be notified about the status.
What is MP4 (MPEG-4 Part 14)?
MP4 (MPEG-4 Part 14) is one of the most widely used video file formats. It is commonly used for storing video, audio, and subtitles in a compressed form while maintaining high quality. MP4 files are often used for streaming over the internet, on mobile devices, and for storing video content on platforms like YouTube.
MP4 is based on the MPEG-4 video compression standard and supports various codecs, including H.264 and AAC, which help deliver high-quality video and audio while keeping file sizes relatively small.
How to open MP4?
MP4 files can be opened with virtually all modern media players, including VLC Media Player, Windows Media Player, and QuickTime on macOS.
Mobile devices such as smartphones, tablets, and laptops natively support MP4 files, making it an ideal choice for video playback across platforms.
MP4 is Developed by: MPEG (Moving Picture Experts Group)
MP4 was Released on: 2001
Useful Links for MP4:
How to convert MP4?
Converting MP4 files is easy using online video converters. You can upload your MP4 file and choose from a variety of output formats such as MKV, AVI, or even audio formats like MP3.
Our online tool ensures fast and high-quality conversion, making your MP4 files compatible with many different devices, video players, and platforms.
What is MKV (Matroska Video)?
MKV (Matroska Video) is an open-source container format that can hold an unlimited number of video, audio, picture, or subtitle tracks in one file. It is designed to be flexible and is often used for high-definition video content.
MKV is a popular choice for storing HD movies, TV shows, and videos due to its ability to support almost any type of video and audio codec, as well as multiple audio tracks and subtitles within one file.
How to open MKV?
MKV files can be opened with several media players, including VLC Media Player, PotPlayer, and Media Player Classic (MPC-HC).
For macOS users, VLC and IINA are great options to play MKV files. You can also use the official Elmedia Player for MKV playback.
MKV is Developed by: Matroska Association
MKV was Released on: 2003
Useful Links for MKV:
How to convert MKV?
You can easily convert MKV files to other formats like MP4, AVI, or MOV using our online video converter. Simply upload the MKV file, select your desired output format, and start the conversion process.
Our tool ensures quick and high-quality conversion, making MKV files compatible with a variety of devices and platforms.
What Our Users Say
Don't take our word for it – here's what users think about Runconvert.
Saved me hours of work
I had to convert multiple PDFs to Word for editing. This tool made it so easy and preserved all the formatting perfectly. The batch processing feature is a game changer.
Michael T
Professional quality
As a graphic designer, I need reliable conversion tools. This site delivers professional quality every time. The image conversions maintain resolution and color accuracy.
Elena R
Fast and reliable
I've tried many conversion tools but this one is by far the fastest and most reliable. No watermarks, no quality loss, and the interface is so intuitive.
David K
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