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MP4 to MKV Converter
Convert MP4 to MKV online for free — no signup, no watermark, instant download.
Drag & drop files here
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Max 100MB per file · Up to 10 files
About this tool
Free MP4 to MKV Converter — No Signup, No Watermark
FlipFileZone lets you convert MP4 videos to MKV entirely in your browser — no software to install, no account required, and no watermark on the output. The converter runs on our servers so even low-powered devices can handle large files. Your files are automatically deleted after download, keeping your data private.
How to use — step by step
1
Upload your MP4 video
Click the upload area or drag and drop your MP4 file. You can add multiple files at once for batch conversion.
2
MKV is pre-selected
The converter automatically selects MKV as the output format. Switch to any other format using the dropdown if needed.
3
Click Convert
Hit the Convert button. Your video is processed securely on our servers in seconds.
4
Download your file
Download your MKV file immediately once conversion is complete. Files are deleted from our servers right after.
Other formats you can convert MP4 to
Features
bolt
Fast conversion
Convert MP4 to MKV in seconds — server-side processing, no waiting.
no_accounts
No signup required
Start converting immediately. No account, no email address, no credit card.
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No watermark
Your MKV output files are clean — we never add branding or watermarks.
lock
Private & secure
Files are transferred over HTTPS and automatically deleted after download.
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Batch conversion
Upload and convert multiple files at the same time — download them all as a ZIP.
devices
Works on any device
Runs in any modern browser on Windows, Mac, Linux, iOS and Android.
Frequently asked questions
Is the MP4 to MKV converter free?
Yes — FlipFileZone is 100% free with no account required, no credits, and no hidden charges.
Is there a file size limit for MP4 to MKV conversion?
There is no hard file size limit. Very large files may take slightly longer depending on your internet speed.
Can I convert multiple MP4 files to MKV at once?
Yes. Drop multiple MP4 files into the converter and they will all be converted simultaneously. You can then download everything as a single ZIP.
Does the MP4 to MKV conversion affect quality?
You can set the output resolution and bitrate before converting.
Are my files kept private?
Your files are uploaded over an encrypted HTTPS connection and automatically deleted from our servers after you download them. We do not store, analyse or share your files.
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