MP4 to MKV Converter

MP4 to MKV converter & joiner. Lossless MKV converter for HD/4K. Works offline!

MP4 to MKV Converter & Joiner - Lossless Video Converter

Convert MP4 to MKV and join multiple videos into one MKV file with no quality loss. This mp4 to mkv converter is your ultimate mkv video converter app. Whether you need to convert mp4 to mkv, mkv to mp4, mkv to mp4 converter, AVI, MOV, FLV, this mp4 to mkv converter app does it all — fast, lossless, offline! Mkv to mp4 is ideal for phones and TVs when codecs allow stream-copy.

🎬 What Can You Do?
• MP4 to MKV converter with no quality loss
• MKV joiner - merge multiple videos into one MKV file
• Change between MKV, MP4, MOV, AVI, FLV, M4V, TS, MTS, M2TS, 3GP
• Combine mp4 to mkv in one tap with stream-copy
• MKV converter no watermark - clean output, every time
• 4K MKV converter for cinema-grade archiving
• Batch convert and merge multiple files at once

🔄 Popular Conversions Supported

MKV: MKV to MP4, MKV to MOV, MKV to AVI, MKV to FLV, MKV to M4V, MKV to TS, MKV to MTS, MKV to M2TS, MKV to 3GP

MP4: MP4 to MKV, MP4 to MOV, MP4 to AVI, MP4 to FLV, MP4 to M4V, MP4 to TS, MP4 to 3GP

MOV: MOV to MKV, MOV to MP4, MOV to AVI, MOV to FLV, MOV to M4V, MOV to 3GP

AVI: AVI to MKV, AVI to MP4, AVI to MOV, AVI to FLV, AVI to M4V, AVI to 3GP

FLV: FLV to MKV, FLV to MP4, FLV to MOV, FLV to AVI, FLV to M4V, FLV to 3GP

M4V: M4V to MKV, M4V to MP4, M4V to MOV, M4V to AVI, M4V to FLV, M4V to 3GP

TS / MTS / M2TS: TS to MKV, TS to MP4, TS to MOV, MTS to MKV, MTS to MP4, MTS to AVI, M2TS to MKV, M2TS to MP4, M2TS to AVI, MTS to FLV, M2TS to M4V

3GP: 3GP to MKV, 3GP to MP4, 3GP to MOV, 3GP to AVI, 3GP to FLV, 3GP to M4V, 3GP to TS

💡 Why Use This MKV Converter?
• Convert mp4 to mkv without any limitations
• Offline mkv converter app - no data collection
• Lossless mkv converter with stream-copy mode
• MKV joiner app for merging episodes and clips
• 4K mkv converter for HDR-ready video archives
• Mkv converter no quality loss guaranteed
• HD video converter and batch video converter in one app
• Ultimate mkv converter app

🔑 Key Features

✅ Supports 10 Video Formats
MKV, MP4, MOV, AVI, FLV, M4V, TS, MTS, M2TS, 3GP - convert between any!

✅ MKV Joiner / Merger
Combine multiple videos into one MKV file with no quality loss.

✅ Lossless Conversion
Stream-copy mode for instant MP4 to MKV - no re-encoding.

✅ 4K & HD Support
Up to 3840x2160 resolution preserved with original bitrate.

✅ Batch MKV Converter
Select multiple videos and convert them all at once.

✅ Video Trimmer & Compressor
Cut and shrink videos before converting.

✅ Customize Output
Adjust bitrate, resolution, codec, frame rate.

✅ 100% Privacy
Files stay on your device. No uploads, no internet.

👤 Perfect For
• Movie collectors needing mkv converter for HD/4K archives
• GoPro / dashcam users with mkv joiner needs
• Plex / Kodi / VLC users using mkv format converter
• Editors needing lossless mkv converter on mobile
• Anyone using mp4 to mkv converter app daily

📲 How to Use
Open MP4 to MKV converter app → Select videos → Choose MKV or any format → Tap Convert or Join!

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Download the ultimate MP4 to MKV Converter & Joiner now!