Convert MP4 to MKV
Free online MP4 to MKV converter — no signup, no watermark
Convert MP4 (MPEG-4 Part 14) files to MKV (Matroska Video) format online for free. Our MP4 to MKV converter runs entirely in your browser — just drag in your file, click convert, and download the result. No software to install, no account required, and your files stay private.
How to convert MP4 to MKV in 4 steps
- 1
Upload your MP4 file
Drag and drop your MP4 file into the converter, or click to browse from your device. We support files up to 2GB.
- 2
Choose MKV as the output format
MKV is pre-selected. Optionally adjust quality, resolution or bitrate if your file needs custom settings.
- 3
Convert MP4 to MKV
Click the convert button. Our converter processes your MP4 file and produces a high-quality MKV output, usually in under a minute.
- 4
Download your MKV file
Once conversion is complete, download your MKV file. Your original MP4 stays untouched and we delete uploaded files within an hour.
Why convert MP4 to MKV?
MP4 is the most widely supported video container format, offering excellent compression with H.264 or H.265 codecs while preserving quality. It works on virtually every device, browser, and platform. MKV is an open-source container format that can hold an unlimited number of video, audio, subtitle and metadata tracks in one file. It's the go-to format for high-quality movie storage and Blu-ray rips. Converting from MP4 to MKV is useful when you need high-quality movie storage or want to take advantage of supports unlimited tracks and subtitles.
Top reasons to switch to MKV
- High-quality movie storage
- Multi-language video files
- Blu-ray and DVD archival
- Files with multiple subtitle tracks
MP4 vs MKV: side-by-side
MP4
Pros
- + Universal device and browser support
- + Excellent compression-to-quality ratio
- + Small file sizes
- + Supports subtitles and metadata
Cons
- − Lossy compression by default
- − Can require licensing for some codecs
MKV
Pros
- + Supports unlimited tracks and subtitles
- + Open source and royalty-free
- + Excellent quality preservation
Cons
- − Not natively supported on iOS or Safari
- − Larger files than MP4
- − Limited streaming support
MP4 to MKV — Frequently Asked Questions
Is converting MP4 to MKV free?
Is converting MP4 to MKV free?
Yes, our MP4 to MKV converter is 100% free. There are no hidden fees, no signups required, and no watermarks added to your converted MKV files.
Will I lose quality converting MP4 to MKV?
Will I lose quality converting MP4 to MKV?
Our converter uses high-quality encoding settings to preserve as much of the original MP4 quality as possible in the MKV output. For lossless results, choose the "high quality" preset.
How long does MP4 to MKV conversion take?
How long does MP4 to MKV conversion take?
Most MP4 files convert to MKV in 30 seconds to a few minutes, depending on the file size, duration, and your internet connection. Larger files take longer.
Is it safe to upload my MP4 file?
Is it safe to upload my MP4 file?
Yes. All uploads use encrypted HTTPS connections, files are processed on isolated servers, and converted MKV files are automatically deleted within one hour of conversion.
Can I convert MP4 to MKV on mobile?
Can I convert MP4 to MKV on mobile?
Absolutely. Our MP4 to MKV converter works in any modern browser on iPhone, Android, iPad, Windows, macOS and Linux — no app install required.
What's the maximum file size for MP4 to MKV?
What's the maximum file size for MP4 to MKV?
You can convert MP4 files up to 2GB to MKV for free. For larger files, contact us about our batch and premium options.
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