Best free mkv to mp4 converter that works on windows 11?

HandBrake is a free, open-source, and widely trusted video transcoder that excels at converting video files (like MKV) into the more universally compatible MP4 format, with a strong focus on compression and customization. While it can perform simple container changes, its core strength lies in re-encoding and optimizing video, making it ideal for reducing large file sizes, ensuring broad device playback, and applying fine-tuned adjustments to video quality, audio tracks, and subtitles through an accessible interface.

Free MKV to MP4 Converter Guide

Step 1: Launch HandBrake and open your MKV file using the "Open Source" button or drag-and-drop.

Step 3: On the right, select a relevant preset (like "Fast 1080p" or "Apple TV 4K") from the built-in list. This automatically configures compatible settings for your target device or use case.

Step 2: Navigate to the tabs to make changes—set your output format to MP4 in the Summary tab, choose video quality in the Video tab (using the constant quality slider is recommended), and select which audio and subtitle tracks to include.

Step 4:  Click the "Start Encode" button at the top to start converting .mkv to .mp4. HandBrake will re-encode and save your new MP4 file to your chosen destination folder.

HandBrake is a powerful, free tool best used when you need to actively transcode and compress an MKV for storage or compatibility reasons, rather than just changing its container. Its combination of user-friendly presets and deep advanced controls makes it the go-to choice for enthusiasts and professionals looking to standardize their video library efficiently.