Convert MP4 Video files to Matroska Video format instantly. Free, fast, and private — no signup required.
Supports MP4 and more
Files are processed locally in your browser. Nothing is uploaded to a server.
The MP4 to MKV converter transforms MP4 Video files into Matroska Video format. Upload your .mp4 file and get a .mkv file instantly — no software to install, no account to create.
MP4: The universal video format. Works everywhere. MKV: Open container format supporting multiple tracks. Converting from MP4 to MKV is useful when you need the specific advantages of the MKV format — whether that's compatibility, file size, quality, or feature support.
The converter transcodes your MP4 video file to MKV format. Video and audio streams are re-encoded using appropriate codecs for the target container. You can adjust resolution, bitrate, and frame rate to control output quality and file size.
Getting Started
Drag and drop your file into the converter, or click to browse. Supports MP4 and more.
Configure output settings like quality, size, and format options. Defaults work well for most use cases.
Click "Convert" and your MKV file is ready in seconds. Free, unlimited, no account required.
Sharing videos across devices and platforms. Preparing content for social media, web embedding, or specific player requirements. Reducing file sizes for email or messaging.
| Attribute | MP4 | MKV |
|---|---|---|
| Format type | MP4 Video | Matroska Video |
| MIME type | video/mp4 | video/x-matroska |
| Typical use | The universal video format. Works everywhere. | Open container format supporting multiple tracks. |
| Keep as source when | your device or app supports MP4 | you need broader device support for MKV |
In short: keep MP4 when you are still working with the file, and use MKV when you are sharing, publishing, or opening it on devices that do not support MP4.
FAQ
Upload your .mp4 file to the converter, and it produces a .mkv file automatically. Click Download to save the result. The entire process runs in your browser — nothing is uploaded to a server.
Yes. Completely free with no signup, no watermarks, and no file limits. You can convert as many files as you need.
Yes. Every conversion runs locally in your browser. Your file is never uploaded to a server, never stored, and never seen by anyone but you. This makes the MP4 to MKV converter safe for contracts, ID scans, and other sensitive documents.
No fixed limits. Because files are processed on your own device rather than a server, the practical limit depends on your device's memory, not an upload quota.
Yes. You can set the bitrate, quality level, and other encoding parameters before converting. Higher quality means larger files.
Yes. Upload multiple .mp4 files and they all convert to .mkv format. Download them individually or as a batch.
MP4 is a MP4 Video file — The universal video format. Works everywhere. MKV is a Matroska Video file — Open container format supporting multiple tracks. The right choice depends on where the file needs to open and whether you are still editing it.
Yes. The converter runs in any modern browser — Android, iPhone, iPad, Windows, macOS, and Linux. No app installation is needed because all processing happens on your own device.
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