Convert MKV to MP4 Online Free

Convert Matroska (.mkv) video to MP4 online free. Fast browser-based conversion, secure processing, and no software install.

Or drop files here. Max file size 1GB.

Choose a file before converting.

Format de intrare

MKV video

MKV is a flexible Matroska video container often used for HD movies, subtitle tracks, multiple audio streams, and media library files. It is powerful, but some phones, browsers, TVs, editors, and upload tools expect MP4 instead.

Format de ieșire

MP4 video

MP4 is the most widely supported video container for iPhone, Android, Windows, macOS, smart TVs, browsers, video editors, messaging apps, and social media uploads.

How to convert MKV to MP4 online

Use this MKV to MP4 converter online free when a Matroska (.mkv) file will not upload, import, or play in the app you need. The converter creates an MP4 output that is easier to share across phones, browsers, TVs, editors, and social platforms.

You can upload files up to 1 GB, convert without creating an account, and adjust settings such as codec, quality, bitrate, resolution, and audio options before starting.

  1. 1 Upload your MKV video file.
  2. 2 Choose MP4 as the output format if it is not already selected.
  3. 3 Open settings if you need to adjust codec, quality, bitrate, resolution, or audio options.
  4. 4 Click Convert to start the MKV to MP4 conversion.
  5. 5 Download the converted MP4 file when processing is complete.

For many MKV uploads, Convertr can preserve the source quality when the video and audio streams are already compatible with MP4. If the source uses codecs that MP4 players do not support, choose compatible MP4 settings for broader playback.

Best MKV to MP4 settings for compatibility and quality

These settings summarize the practical advice from our MKV guides directly on the converter page, so you can choose the right MP4 output before starting.

Use H.264 video and AAC audio for broad playback

H.264 video with AAC audio is the safest MP4 combination for phones, browsers, TVs, editors, social platforms, and older playback devices.

Keep the original resolution and frame rate when quality matters

Match the source dimensions and frame rate unless you intentionally need a smaller file. This helps avoid blur, judder, and unnecessary detail loss.

Raise bitrate or quality for HD and 4K MKV files

If the first MP4 looks soft or blocky, use a higher quality or bitrate setting. Higher-quality settings keep more detail, especially in fast motion and high-resolution video.

Use HEVC only when your playback devices support it

H.265 or HEVC can reduce file size at similar quality, but H.264 remains the more universal MP4 choice for maximum compatibility.

MKV to MP4 FAQ

Is this MKV to MP4 converter online free?

Yes. Convertr lets you convert MKV to MP4 online for free with no registration, no software install, and no watermark.

Why convert MKV to MP4?

MKV is the common file extension for Matroska video. Matroska can store multiple tracks and subtitles, but MP4 is accepted by more phones, browsers, TVs, editors, and social platforms. Converting MKV to MP4 makes the video easier to play, upload, and share.

Will converting MKV to MP4 reduce quality?

Quality depends on the source codecs and selected settings. If the streams are MP4-compatible, the conversion can preserve quality by changing the container. If re-encoding is needed, use higher quality settings to preserve detail.

Can I convert large MKV files to MP4?

Yes. You can upload MKV videos up to 1 GB per file, which covers many recordings, exports, and downloaded video files.

Are my uploaded MKV files secure?

Files are transferred securely, processed for conversion, and automatically deleted after the conversion flow. You do not need to create an account.

Related video converters

Need another MP4 workflow? Try these common video conversion pages.

Convertor video Convertor MP4 MKV Converter MKV to AVI for legacy playback Convertirile MKV la MOV WEBM la MP4 TS to MP4 MOV to MP4 AVI la MP4 M4V to MP4 Convertirea MP4 în MKV Inspectorul Matrosca MKV Track Extractor MKV Subtitle Extractor MKV Audio Extractor MP4 la WEBM Repair MP4 video HEVC to MP4 AV1 / AV01 la MP4

What happens when MKV becomes MP4

Format sursă

MKV is a flexible Matroska container that can carry multiple audio, video, and subtitle tracks.

Formatul țintă

MP4 is a widely supported media container, commonly carrying H.264 or H.265 video and AAC audio.

Ce schimbări

The MKV container is read and the selected video and audio streams are written into a MP4 container.

Codecs may be transcoded even when the visible resolution and duration stay the same.

Ce este păstrat
Duration, frame order, and visible dimensions are preserved unless you select trimming, frame-rate, or resolution changes.
What may be lost
Extra subtitle, attachment, chapter, or alternate audio tracks may be omitted when the target container or selected settings do not support them.
Codec and quality implications
Container names do not guarantee a codec. Quality and compatibility depend on the selected video codec, audio codec, bitrate, frame rate, and resolution.
Realistic limitations
A valid MKV extension does not guarantee that every codec inside the container is decodable. Corrupt, encrypted, or unusual streams can fail.

Etapele de conversie

  1. Upload a MKV file no larger than 1 GB.
  2. Confirm that MP4 is selected as the target.
  3. Open settings only if you need to change codec, quality, bitrate, frame rate, resolution, or audio behavior.
  4. Start the conversion. A healthy compatible worker begins processing immediately.
  5. Download the MP4 file and check the result before deleting your source.

rezolvarea problemelor

The MKV file is rejected or will not open.
Confirm that the file is not empty, password-protected, or corrupt and that its real format matches the extension.
The MP4 file is larger than expected.
Choose a more efficient codec or lower quality setting when available. Lossless and uncompressed targets are often larger by design.
The result has no sound or will not play.
Try a broadly supported target codec and verify that the source contains a decodable audio stream.

Confidențialitate și păstrarea fișierelor

Uploads and converted files are processed automatically and irreversibly deleted within 24 hours. You can delete them sooner with the delete control. Convertr does not read, mine, sell, or manually review file contents.

Read the privacy policy

Alternative utile

MKV to AAC Use this when AAC better matches the app, codec, or editing workflow you need. MKV to AIFF Use this when AIFF better matches the app, codec, or editing workflow you need. MP4 to MKV Use the reverse conversion when you need to return to the original format family.