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Drop your .mkv file here
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Convert MKV videos to MP4 format for maximum compatibility with all devices and players.
Upload your MKV file, click Convert, and download the MP4 output. Video is encoded with H.264 and audio with AAC.
Upload your MKV file
Drop a .mkv file onto the upload area. MKV containers can hold multiple audio and subtitle tracks.
Select audio track (optional)
If the MKV has multiple audio tracks, choose which one to include in the MP4.
Convert
Click "Convert to MP4". FFmpeg remuxes or re-encodes the content into a standard MP4 container.
Download
Save the MP4 to your device for playback on any player or upload to any platform.
Mobile & iPhone Playback
MKV is not supported by iPhones or many Android apps — convert to MP4 for native playback everywhere.
Social Media Upload
YouTube, Instagram, and TikTok all accept MP4 but not MKV — convert before uploading.
Smart TV Streaming
Most smart TVs and streaming sticks support MP4 natively but struggle with MKV containers.
Video Editing
Import MKV-sourced content into video editors that prefer the widely-supported MP4 format.
Movie Rips
Downloaded movies often come in MKV — convert to MP4 to play on devices without MKV support.
Windows Media Player
Windows Media Player does not support MKV by default — convert to MP4 for seamless playback.
Stream Copy When Possible
When codecs are compatible, the tool uses stream copy (-c copy) for instant conversion with zero quality loss.
H.264 + AAC Encoding
Output uses H.264 and AAC — the most widely compatible codec pair for all devices and platforms.
100% Browser-Based
FFmpeg WebAssembly runs entirely in your browser — no server upload, no privacy risk for your videos.
Fast Start Optimized
-movflags +faststart moves metadata to the file front for immediate streaming without full download.
No File Size Limits
No server means no upload size cap — convert large MKV files without restriction.
Free — No Watermarks
No watermarks on output, no per-file charges. Use free for standard file sizes — sign up free to raise your limit to 80 MB, or upgrade to Pro for 250 MB.
Also Known As
Trusted Worldwide
iLoveDocsTools is used by students, professionals, and businesses across the United States, Canada, United Kingdom, Australia, India, and more than 100 other countries. All tools are browser-based and process files privately — your files never leave your device. Free to use, with Pro plans for unlimited access.
All processing happens directly in your browser. Your documents are never sent to any server — complete privacy guaranteed for users in the USA, Canada, UK, and worldwide.
Every tool on iLoveDocsTools is free to use. Need more? Upgrade to Pro for unlimited usage, priority access, and no daily limits. Trusted by students, freelancers, and teams across North America and Europe.
Whether you are on a Mac, Windows PC, iPhone, or Android in New York, Toronto, London, or Sydney — our tools work instantly in any modern browser.
Looking for free PDF tools in the USA? Free document converters in Canada? Online PDF editors in the UK or Australia? iLoveDocsTools offers 70+ free tools — merge PDF, split PDF, compress PDF, convert Word to PDF, Excel to PDF, JPG to PDF, and many more — all free, all instant, all private. No watermarks. No file size limits. Just free tools that work.