MKV is common for downloaded movies but not supported on iPhones or many smart TVs. Converting to MP4 makes MKV files play everywhere.
1
Open Fourmeld File Converter
Go to fourmeld.com/files — no login, no signup required.
2
Upload your MKV file
Click Upload and select your MKV file from your device, phone or computer.
3
Select MP4 as output
Choose MP4 from the output format options. Fourmeld detects your file automatically.
4
Download your MP4
Click Convert and download. Ready in seconds — no watermark, full quality.
Tips for best results
- MP4 plays on iPhones, Android, smart TVs, YouTube and all social media
- MKV may contain multiple subtitle tracks — MP4 conversion keeps the primary audio and video
- MKV to MP4 is often a container change with no re-encoding needed — fast and lossless
Convert MKV to MP4 Free — No Signup
Instant MKV to MP4 conversion. No watermark, no account needed.
Convert Files Free on Fourmeld →FAQs
Will subtitles be preserved?
External subtitle files (.srt) are not embedded in MP4. The primary audio track is preserved.
Is MKV to MP4 lossless?
In many cases yes — it's just a container format change with no re-encoding.
Why can't my phone play MKV?
iPhones don't support MKV natively. Android varies by app. MP4 works everywhere.