Free MKV to MP4 Converter
Free MKV to MP4 Converter Online — Instantly Convert and Download MP4 Video for wider browser, device, and media player compatibility. Fast, Easy, and No Watermark.
Drop an MKV video here, or click to upload (max 50 MB).
Upload an MKV video and click Convert to MP4 to preview the video here.
What is an MKV file?
MKV (Matroska Video) is a flexible container that can hold video, multiple audio tracks, subtitles, and chapters in one file. It is popular for screen recordings, personal archives, and high-quality encodes because it supports many codecs. The downside is compatibility: some phones, TVs, browsers, and apps prefer or require MP4 instead. Converting MKV to MP4 makes the same clip easier to play and share. FrontendGeek’s free MKV to MP4 converter runs in your browser — upload an MKV you own or have permission to use, remux when possible to preserve quality (or re-encode when needed), preview, then download with no watermark added.
How to Use This MKV to MP4 Converter?
Upload your MKV video
Drag and drop an MKV into the Upload MKV panel, or click to browse. Only Matroska / MKV video is accepted on this page. Maximum upload size is 50 MB per file.
Convert to MP4
Click Convert to MP4 to send the file for server-side conversion. The tool remuxes when possible or re-encodes when needed, then prepares an MP4 you can preview and save. Keep the tab open until processing completes.
Instant Preview the video
When conversion finishes, the MP4 Preview panel plays your clip. Watch once to confirm picture, sound, and that you converted the right file.
Fast Download the MP4
Click Download MP4 to save the file to your device. The download uses a clean filename based on your upload so it is easy to find in your downloads folder.
Top Features of Our MKV to MP4 Converter
Simple Browser Upload
Drop an MKV or click to upload. No desktop codec installs and no browser extension required.
Fast Online Conversion
Server-side FFmpeg remuxes or re-encodes quickly so you can preview and download without waiting on a heavy local encode.
Quality-Preserving Remux
When streams can be copied into MP4, quality is preserved. If remux fails, the tool re-encodes with a balanced quality preset.
Quick MP4 Preview
Play the converted video before saving so you can verify picture and audio at a glance.
Desktop and Mobile Friendly
The same upload-and-convert workflow works in modern browsers on phones, tablets, and desktops.
Free to Use
Convert MKV to MP4 online for free with clear file-type guidance, a 50 MB upload limit, and no FrontendGeek watermark.
Frequently Asked Questions - FAQs
Is this MKV to MP4 converter free?
Yes. FrontendGeek’s MKV to MP4 converter is free to use online. Upload a supported MKV, convert, preview the video, and download the MP4 with no watermark added by FrontendGeek.
How do I convert MKV to MP4?
Upload an MKV file up to 50 MB, click Convert to MP4, wait for processing, preview if you want, then click Download MP4.
What all types of files can I upload?
MKV / Matroska video only. Other containers (MP4, MOV, AVI, etc.) are not supported on this page — use the matching converter when available.
What is the max file size?
50 MB per upload. For larger videos, compress or trim the file first, or split long recordings into smaller clips.
Will quality drop when converting MKV to MP4?
When streams can be copied (remux), quality is preserved. If remux is not possible, the tool re-encodes with a balanced quality preset. Very unusual codecs may fail or need a different source file.
Can I convert a YouTube link with this tool?
No. This page converts MKV files you upload from your device. To get video from a YouTube URL, use the YouTube to MP4 Converter linked above.
Does conversion keep working if I close the tab?
Keep the tab open until conversion finishes and the download starts. Closing the page early can interrupt processing or the download.
Is it legal to convert MKV to MP4?
Only convert media you own or have permission to use. Respect copyright and local laws. FrontendGeek provides the technical tool; you are responsible for lawful use of any converted files.
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