MKV to MP4 Converter
Convert MKV container files to MP4 without re-encoding the video track. MKV is common for high-definition movies and TV shows but lacks support on most smartphones and streaming devices.
Drop your MKV file here
or click to select file
Supports MKV files - Max 500MB (Pro: 2GB)
Selected Video
Conversion Options
Converting...
This may take a few minutes depending on file size
Uploading...
Conversion Complete!
Your MP4 file is ready to download
Why Convert MKV to MP4?
MKV is powerful but not universally supported. MP4 works everywhere.
Universal Compatibility
MP4 plays on all devices - smartphones, tablets, smart TVs, and gaming consoles without any extra software.
Easy Sharing
Upload to YouTube, social media, or send via messaging apps. MP4 is accepted everywhere.
Quality Preserved
Our converter maintains the original video quality. No degradation in your footage.
How to Convert MKV to MP4
Upload MKV File
Drag and drop your MKV file or click to browse your computer.
Choose Settings
Select quality and resolution options. Keep original quality or compress for smaller files.
Download MP4
Wait for conversion to complete and download your MP4 file.
MKV vs MP4 Comparison
video_fileMKV Format
- +Multiple audio/subtitle tracks
- +Chapter support
- +High quality container
- -Limited device support
- -Not accepted by most platforms
video_fileMP4 Format
- +Universal compatibility
- +Widely accepted online
- +Efficient compression
- +Plays on all devices
- -Fewer advanced features
Frequently Asked Questions
What is the difference between MKV and MP4? expand_more
MKV is a flexible container format that can hold multiple video, audio, and subtitle tracks, making it ideal for archiving. MP4 is a more standardized format with better device compatibility, though it has fewer advanced features. MP4 is the better choice for sharing and playback on most devices.
Does converting MKV to MP4 lose quality? expand_more
No, converting MKV to MP4 does not lose quality if you preserve the original codec and bitrate. FastlyConvert is optimized to maintain the original quality whenever possible. Quality loss only occurs if you intentionally choose lower resolution or higher compression settings.
Will subtitles be preserved when converting MKV to MP4? expand_more
Yes, FastlyConvert preserves subtitle tracks during conversion. All subtitle streams from your original MKV file will be included in the converted MP4 file, maintaining support for multiple languages and hearing-impaired captions.
Can I convert MKV files with multiple audio tracks? expand_more
Yes, FastlyConvert supports MKV files with multiple audio tracks. The converter will preserve all audio streams in the output MP4 file, allowing you to keep multiple language options or commentary tracks in your converted video.
Why won't my MKV file play on my phone or TV? expand_more
Many phones, TVs, and media players don't support the MKV container format or the codecs used inside MKV files. Converting to MP4 makes your video compatible with virtually all devices and apps, ensuring playback on smartphones, smart TVs, and streaming platforms.
More Video Conversions
Explore our other video conversion tools
MKV to MP4 Converter - Convert MKV Video Files Online Free
Need to convert MKV to MP4? Our free MP4 converter transforms your MKV video files into universally compatible MP4 format while preserving high quality video and audio. Simply drag and drop your MKV file or use dragging and dropping from your file manager - the conversion starts instantly and converts your video in seconds.
Why Convert MKV to MP4 Format?
MKV file format is great for storing MKV video with multiple audio and subtitle tracks, but MP4 format offers better compatibility with every media player, smartphone, and streaming platform. Our MP4 converter preserves the original file size and quality while changing the video format.
Preserves Audio and Subtitle Tracks
Unlike other converters, we keep your audio and subtitle tracks intact. Your MP4 video will maintain all the subtitle tracks from the original MKV file. Perfect for movies with multiple languages or hearing-impaired captions.
Features of Our MKV to MP4 Converter
- • High Quality Output: Maintains original high quality - no re-encoding means no quality loss
- • Fast Conversion: Drag and drop your MKV and get your MP4 file in seconds
- • Universal Playback: MP4 video plays on any media player - VLC, Windows Media, QuickTime
- • Optimal File Size: Smart compression keeps file size small without sacrificing quality
- • Multiple Tracks: Preserves video and audio streams including all subtitle tracks
How to Convert MKV Video Files
Converting video files is easy: drag and drop your MKV file into the upload area, or click to browse. Our converter automatically detects the video format and starts processing. Within moments, your MP4 file will be ready to download. The converted MP4 video is compatible with all video files players and mobile devices.