Convert MKV to MP4 Free
Convert MKV to MP4 and turn an MKV file into a web-ready MP4 that plays everywhere. This free MKV to MP4 converter adds no account, no watermark, and no monthly cap, VidClean re-encodes your MKV to H.264 MP4, so you get a smaller, widely compatible file. Looking for a converter for MKV to MP4 that runs in your browser? This is it.
Files up to 2GB · Output: MP4 (H.264, AAC)
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MKV · MP4 · MOV · WebM · Up to 2GB
No sign up needed. Just drop your MKV.
Processing time depends on file size and your upload speed.
No account required
Just upload and go. Nothing to sign up for, no email, no credit card.
No watermark, ever
Your MP4 comes back clean. No branding added.
Files deleted in 1 hour
Your file does not live on our servers. Privacy by default.
How It Works
Upload your MKV
MKV up to 2GB. MP4, MOV, and WebM also work. Drag and drop or click to browse.
VidClean converts the video
The video is re-encoded to H.264 MP4. The result is a smaller, widely compatible MP4 that looks the same at normal viewing sizes on typical content.
Download the MP4
Ready in seconds. Play it on phones, browsers, editors, and social platforms. If you want to shrink it further, compress the video instead.
Who uses this
People with MKV files that will not play on a phone, in a browser, or in their video editor. Anyone who downloaded an MKV and needs an MP4 that uploads to social platforms and email without complaints. Creators who want a single, widely compatible format. If you only need part of the frame, crop your video first before converting.
Drop your MKV, get an MP4 back. No editor required.
Frequently Asked Questions
Everything you need to know about converting MKV to MP4.
Will the quality stay the same? expand_more
The file is re-encoded to H.264 MP4, so it is not a byte-for-byte copy of the original. On typical content at normal viewing sizes it looks the same, while the MP4 is usually smaller and plays on more devices and apps.
What formats can I convert from and to? expand_more
You can convert MKV, MP4, MOV, and WebM files in. The output is always an MP4 (H.264 video, AAC audio) for broad compatibility across phones, browsers, editors, and social platforms.
How large a file can I convert? expand_more
Files up to 2GB are supported. That covers most movies, recordings, and long clips stored in MKV.
Is my file kept private? expand_more
Yes. Files are processed on a private server and automatically deleted 1 hour after the job finishes. We never view, share, or store your content.
Is it free, or is there a paid plan? expand_more
Completely free. No account, no signup, no watermark. VidClean adds nothing to your file and accepts files up to 2GB.
How long does the conversion take? expand_more
Roughly real-time on the input duration. A one-minute video typically finishes in under a minute. A five-minute video takes a few minutes. Larger files and higher resolutions take proportionally longer.
Also try: Compress Video at vidclean.net/compress-video
Last updated: July 2026