How to use it
- Upload your MKV file, or paste a link to it.
- Choose Convert.
- MP4 is already selected as the output.
- Press Convert.
- Download your MP4 file.
Features
Original quality preserved
Wherever the codecs allow it we copy the video stream instead of re-encoding it. That means no generation loss, no blurring, and a result that finishes in seconds.
Private by default
No sign-up, no tracking of what you process, and automatic deletion. Your links are never sent to analytics and your files are never made public.
Built for phones
Large touch targets, a timeline you can actually drag with a thumb, and a sticky action button. Works in Safari on iPhone and Chrome on Android without an app.
How it works technically
We probe the MKV file first to see which codecs it contains. If they are valid inside MP4, FFmpeg rewrites the container with -c copy and the compressed picture data is untouched. Otherwise we re-encode to H.264 and AAC, which is the combination with the widest device support.
Frequently asked questions
Does converting MKV to MP4 lose quality?
Not when the streams can simply be copied — the result is identical to the source. If a re-encode is unavoidable we use settings that keep the difference invisible in normal viewing.
What happens to my file after processing?
It is deleted automatically. Your result is stored in a temporary folder for a short window so you can download it, then removed permanently along with any intermediate files. We do not publish, index, share or keep your media, and we never use it to train AI models.
Do I need to install any software?
No. Everything runs in your browser and on our servers, so it works the same on Windows, macOS, Linux, Android and iPhone. There is no app to install and no account to create.
Can I process any video I find online?
Only content you own or are otherwise permitted to process. The service works with publicly accessible links and does not bypass DRM, paywalls, sign-in or any other access control. You are responsible for having the rights to the material you submit.