How do I convert MP4 to MKV?

Upload your MP4 file, select MKV as the output format, then choose your preferred video codec (e.g., H.264 or HEVC) and audio codec (AAC, AC-3). You can also add subtitle files or adjust container settings before clicking Convert. Once finished, download your MKV file locally.

Why should I convert MP4 to MKV instead of keeping MP4?

MP4 is universally compatible with browsers, mobile devices, and editing software, but MKV is a highly flexible open container that supports multiple video and audio streams, subtitles, chapters, and HDR metadata. Converting to MKV is ideal for archiving, editing in advanced NLEs, or playing on media centers like Kodi, Plex, and VLC, where you can take advantage of multiple audio tracks or embedded subtitles.

Does converting MP4 to MKV preserve quality, subtitles, and HDR metadata?

Yes, for standard files the conversion remuxes the original video and audio codecs (like H.264 and AAC) straight into the MKV container without re-encoding, so resolution, bitrate, and quality remain identical. HDR10+ dynamic metadata and Dolby Vision are preserved if present in the source MP4. Subtitles in MP4 are usually limited to simple formats like 'mov_text' or 'tx3g', but MKV can also embed SRT, ASS, PGS, and VobSub, so we extract and remux them appropriately. If you choose to re-encode to HEVC or AC-3, there may be minor quality loss depending on the selected bitrate and codec.

Is MP4-TO-MKV free to use?

Yes, MP4-TO-MKV on LetsConvert is 100% free with no registration or hidden fees required.

Are my uploaded files safe and secure?

Yes! File privacy and security are guaranteed. Basic conversions run locally in your browser. Files sent for server processing are automatically deleted within 1 hour.

Does this converter work on mobile phones and tablets?

Yes! MP4-TO-MKV works seamlessly across iPhone, Android, iPad, Mac, Windows, and Linux browsers without installing any app.

Is there any software installation required?

No software or browser extension installation is needed. All conversions are performed directly online.

MP4➔MKV· 100% Free & Full HD

MP4-TO-MKV

Easily convert MP4 to MKV to unlock lossless audio, multiple subtitle tracks, and embedded chapters — ideal for archival, editing, and Plex.

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Supports up to 50MB · Hardware accelerated transcode

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MP4

MPEG-4 Part 14 Video Container

Source Format

MP4 is the undisputed global standard digital video format. Supported across every computer, smartphone, smart TV, browser, and social platform, it encapsulates high-efficiency H.264/H.265 video and AAC audio with unmatched playback reliability.

Category: Digital Video

MIME Type: video/mp4

Developer: Moving Picture Experts Group (MPEG)

Best For: Social media video, YouTube uploads, mobile video recording, web video streaming, and video archiving.

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MKV

Matroska Multimedia Container

Target Output

MKV is an open-standard, highly flexible multimedia container format capable of holding an unlimited number of video, audio, picture, and subtitle tracks inside a single file with chapter markers and rich menu systems.

Category: Digital Video

MIME Type: video/x-matroska

Developer: Matroska Open Standard

Best For: Movie backups, high-definition film archiving, multi-language video distribution, and anime media.

💡 Technical Guide & Conversion Insights

Why Convert MP4 to MKV?

Converting from MP4 (MPEG-4 Part 14 Video Container) to MKV (Matroska Multimedia Container) is essential when you need enhanced compatibility, reduced file size, or specific feature support. While MP4 is ideal for Social media video, YouTube uploads, mobile video recording, web video streaming, and video archiving., MKV offers superior advantages for Movie backups, high-definition film archiving, multi-language video distribution, and anime media.. Our secure online conversion engine ensures that all your MP4 file attributes, geometry, quality, and metadata are seamlessly preserved during the transformation into MKV.

● MP4 Key Advantages:

✓100% universal hardware and software playback compatibility
✓High compression efficiency with excellent HD/4K fidelity
✓Optimal format for YouTube, TikTok, Instagram, and web embedding

● MKV Key Advantages:

★Supports multiple audio language tracks and switchable soft subtitles
★Compatible with any modern video codec (AV1, HEVC, VP9, H.264)
★Open-source and highly resilient to corruption

MP4 vs MKV Comparison Table

Detailed technical differences and capabilities between MPEG-4 Part 14 Video Container and Matroska Multimedia Container.

Feature / Attribute	MP4	MKV
Primary Format Name	MPEG-4 Part 14 Video Container	Matroska Multimedia Container
Primary File Category	Digital Video	Digital Video
Standard MIME Type	video/mp4	video/x-matroska
Core Developer / Standard	Moving Picture Experts Group (MPEG)	Matroska Open Standard
Optimal Use Case	Social media video, YouTube uploads, mobile video recording, web video streaming, and video archiving.	Movie backups, high-definition film archiving, multi-language video distribution, and anime media.

❓ Common Questions

Frequently Asked Questions (MP4 to MKV)

Everything you need to know about converting MP4 to MKV with LetsConvert.

To convert your MP4 file to MKV, upload your file by dragging and dropping it into the upload box or selecting it from your device. Adjust any optional quality or dimension settings, then click 'Convert'. Your converted MKV file will be ready for instant high-speed download within seconds.

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100% Secure & Automatic File Purging

Your MP4 files are encrypted with 256-bit SSL and permanently deleted from our servers within 60 minutes.

● Zero File Storage

How to Convert MP4-TO-MKV

Select or drop your Mp4 file.

Initiate the MKV conversion process.

Download your converted MKV file.

⚡ Related Video Tools

MP4-TO-MKV

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Why Convert MP4 to MKV?

● MP4 Key Advantages:

● MKV Key Advantages:

MP4 vs MKV Comparison Table

Frequently Asked Questions (MP4 to MKV)

100% Secure & Automatic File Purging

How to Convert MP4-TO-MKV

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