MP4 to MKV converter
Turn your MP4 into a clean, ready-to-use MKV in a couple of clicks – no software to install, nothing to sign up for.
Convert MP4 to MKV
Drop your files to try StandardsPDF. This tool is available in the full workspace.
Keeps the video stream and audio track in sync
Lets you pick a quality preset to balance size and clarity
Downloads a ready-to-use MKV you can share immediately
Files auto-deleted from our servers within 60 minutes
How it works
Convert MP4 to MKV in 3 steps
Select the MP4 you want to convert
Start the conversion – most finish in seconds
Grab your new MKV, ready to use
Private by default
Files are encrypted in transit and deleted within 60 minutes.
Fast
Most jobs finish in under 10 seconds. No queueing.
No signup on free tier
5 documents per day, no credit card required.
FAQ
Frequently asked questions
How do I convert MP4 to MKV?+
Upload your MP4 file (or drag it onto the box above), wait a few seconds while StandardsPDF converts it in your browser, then download the MKV. There is nothing to install and no account required.
Is converting MP4 to MKV free?+
Yes. MP4 to MKV conversion is free on the StandardsPDF free tier – no watermark, no signup, and no credit card. A Pro tier lifts the file-size and daily limits if you need more.
Will the MKV keep the quality of my MP4?+
StandardsPDF aims for the highest fidelity the MKV format allows, so your video comes through looking as close to the original as possible. Some format-specific details may adapt where MKV works differently to MP4.
Will the audio from my MP4 stay in sync in the MKV?+
Yes – when converting MP4 to MKV the audio track is muxed back with the video so playback stays perfectly in sync.
Can I convert MP4 to MKV on my phone?+
Yes – the MP4 to MKV converter is fully responsive and works in Safari, Chrome and other modern browsers on iOS, Android and iPadOS.
How long does a MP4 to MKV conversion take?+
Most MP4 files convert to MKV in a few seconds. Larger or higher-resolution files take a little longer, but there is never a queue on the free tier.
Is my MP4 file kept private during MP4 to MKV conversion?+
Yes. Your MP4 is processed in an isolated worker, never shared, and permanently deleted from our servers within 60 minutes. Most MP4 to MKV conversions happen right in your browser.
Do I need to install anything to convert MP4 to MKV?+
No. Converting MP4 to MKV runs entirely in the browser – no desktop software, no extensions and no account for the free tier.