MKV to MP4 Converter

MKV to MP4 Converter | Online Free Tool | Elysia Tools

Tool usage guide

Learn when to use this tool, what it supports, and how real users apply it.

Key facts

Category: Media
Input types: file, select, number
Output type: file
Sample coverage: 4
API ready: Yes

Overview

The MKV to MP4 Converter allows you to easily transform Matroska video files into universally compatible MP4 files. By configuring video codecs like H.264 or H.265, choosing audio codecs, managing subtitles, and adjusting CRF quality, you can optimize your videos for playback on any device or platform without losing quality.

When to use

When you have high-quality MKV files that won't play on mobile devices, smart TVs, or web browsers.
When you need to prepare videos for sharing on social media platforms or video hosting sites that require MP4.
When you want to quickly repackage video streams without re-encoding by copying the original codecs.

How it works

1Upload your MKV video file up to the 100 MB limit.
2Select your preferred video and audio codecs, or choose 'Copy' to bypass re-encoding.
3Set the CRF quality level and choose how to handle subtitles, then run the conversion to download your MP4 file.

Use cases

Converting MKV movies to MP4 for playback on iPhones, iPads, or Android devices.
Preparing MKV screencasts for uploading to web platforms that only accept MP4.
Extracting and repackaging video files quickly using the stream copy option to save processing time.

Examples

1. Convert MKV for Mobile Playback

Mobile User

Background

A user has a high-definition MKV video file that cannot be played on their smartphone's default media player.

Problem

The smartphone does not support the MKV container format, requiring a conversion to MP4 with standard H.264 video and AAC audio.

How to use

Upload the MKV file, select 'H.264' as the video codec, 'AAC' as the audio codec, and set subtitle handling to 'Remove Subtitles'.

Video Codec: H.264, Audio Codec: AAC, Subtitle Handling: Remove Subtitles

Outcome

An MP4 video file that plays smoothly on any mobile device.

2. Fast Container Remuxing without Re-encoding

Video Editor

Background

An editor needs to change the container of a video from MKV to MP4 instantly without losing any quality or wasting time on rendering.

Problem

Re-encoding takes too long and can degrade the original video quality.

How to use

Upload the MKV file, set both the Video Codec and Audio Codec options to 'Copy (No Re-encoding)'.

FAQ

Can I convert MKV to MP4 without losing quality?

Yes, by setting both the video and audio codecs to 'Copy', the tool repackages the streams into an MP4 container without re-encoding.

What is the maximum file size supported?

The converter supports MKV video files up to 100 MB.

Which video codecs are supported?

You can choose between H.264 (libx264), H.265/HEVC (libx265), MPEG-4, or copy the original stream.

How does the CRF quality setting work?

CRF stands for Constant Rate Factor. You can set it between 18 (higher quality) and 28 (lower quality) when re-encoding.

Can I keep subtitles in the converted MP4?

Yes, you can choose to convert subtitles to mov_text or copy them directly, though removing them is recommended for maximum compatibility.

Video Codec: copy, Audio Codec: copy

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Inputs

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Learn when to use this tool, what it supports, and how real users apply it.

Key facts

Overview

When to use

How it works

Use cases

Examples

1. Convert MKV for Mobile Playback

2. Fast Container Remuxing without Re-encoding

FAQ

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