Convert MP4 → MKV Online — Free
Convert MP4 video to MKV container.
Drag & drop or click to browse
Accepts .mp4 files up to 500 MB
Free plan includes 3 conversions/day. Need more? Talk to us →
What is a .mp4 file?
MP4 is a widely-used format in the Video category. Convert MP4 video to MKV container. Files in this format are commonly used across various tools, pipelines, and workflows.
What is a .mkv file?
MKV is a popular format in the Video ecosystem. Converting from MP4 to MKV gives you access to its unique features, broader tooling support, and improved interoperability.
How to convert MP4 → MKV online
Upload your file
Drag & drop your .MP4 file onto the upload zone, or click "Browse" to select it.
Validate & preview
The tool checks the file type and size before uploading. Invalid files are rejected immediately with a clear error.
Convert on the server
Click "Convert" to upload and process your file. Server-side conversion typically takes ~120 seconds.
Download your result
When done, click "Download .MKV" to save your converted file. Files are securely deleted after 1 hour.
Frequently asked questions
Is this MP4 to MKV converter free?
Yes. The MP4 → MKV tool is free for up to 3 conversions per day. Pro (30/day) and Business (unlimited) plans unlock higher limits.
Is my file secure on the server?
Your file is uploaded over an encrypted HTTPS connection to a secure server worker. The converted file is stored temporarily and automatically deleted after 1 hour. We never share or store your files longer than necessary.
What is the maximum file size for MP4?
You can convert files up to 500 MB. If your file is larger, consider compressing it first or upgrading to a Business plan for increased limits.
What is the difference between MP4 and MKV?
MP4 and MKV are both formats in the Video category, each with different use cases, tooling support, and feature sets. Convert MP4 video to MKV container.
Can I convert multiple files at once?
Batch conversion is available on Pro and Business plans. Free users convert one file at a time.