Step 1: Transfer your MP4 files using the button above or by slide and deposit.
Step 2: Click the 'Convert' button to start the conversion.
Step 3: Retrieve your converted MKV files.
MP4 to MKV Conversion FAQ
How do I convert MP4 to MKV?
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Converting MP4 to MKV repackages your video from the MP4 container into MKV. MP4.to remuxes the streams without re-encoding where the codecs are compatible (fast and lossless), and transcodes only when the target needs a different codec.
Why would I convert MP4 to MKV?
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You move your content from the MP4 format into MKV so it works in the apps, devices or workflows that prefer MKV.
Will converting MP4 to MKV reduce quality?
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When the codec inside MP4 is compatible with MKV, MP4.to remuxes without re-encoding — zero quality loss. When the codec must change, the video is transcoded with a small, controllable generational loss.
How long does a MP4 to MKV conversion take?
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Short clips finish in seconds. Longer MP4 videos run at roughly real-time or faster on our GPU encoders, so a half-hour recording typically lands in a few minutes.
Which MKV settings should I choose?
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MP4 with H.264 is the safest, most universal MKV-family target. Use WebM for web embedding and MOV for Apple editing pipelines.
Is the MP4 to MKV converter free?
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Yes. Single-file MP4 to MKV conversion is free with no signup. A Pro plan unlocks very large files, unlimited batch jobs and advanced features, but everyday conversions cost nothing.
How large a MP4 file can I convert to MKV?
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Free users can upload MP4 files up to 100 MB — enough for most videos. Pro users go up to several GB per file and can queue large batches.
Can I convert several MP4 files to MKV at once?
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Yes. Drop multiple MP4 files in one go and MP4.to converts them to MKV in parallel. Free accounts handle a couple at a time; Pro accounts have unlimited batch conversion.
Do I need to install any software to convert MP4 to MKV?
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No. The MP4 to MKV conversion runs entirely server-side in your browser — no Photoshop, Office, ffmpeg or any local install. Upload, convert, download.
Can I convert MP4 to MKV on my phone?
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Yes. MP4.to runs in any modern mobile browser, so iPhone, iPad and Android users can convert MP4 to MKV without an app. The MKV result downloads straight to your device.
Are my MP4 files kept private during conversion?
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Yes. Your MP4 upload and the MKV output travel over HTTPS, are never read by a human, and are deleted automatically from our servers shortly after the job finishes. No watermarks, no resale of your data.
Do I need an account to convert MP4 to MKV?
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No account is required for basic MP4 to MKV conversions — you can convert immediately. A free account adds conversion history; a Pro plan adds large files, batch jobs and AI tools.