Convert MKV to MP4 Online Free

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

O arrossega els fitxers aquí. Mida màxima per fitxer: 1 GB.

Tria un fitxer abans de convertir.

Format d'entrada

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 sortida

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.

Convertidor de vídeo MP4 Converter Convertidor MKV Convertir MKV en AVI (per a reproducció en un equip antic) Convertidor MKV a MOV Webm a MP4 TS to MP4 MOV to MP4 AVI a MP4 M4V to MP4 Convertidor de MP4 a MKV Inspecció Matroska MKV Track Extractor MKV Subtitle Extractor Extractor d'àudio MKV MP4 a WEBM Repair MP4 video HEVC a MP4 AV1 / AV01 a MP4

Què passa quan MKV es converteix en MP4

Format d'origen

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

Format de destinació

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

Què canvia

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.

Què es conserva
Duration, frame order, and visible dimensions are preserved unless you select trimming, frame-rate, or resolution changes.
Què es pot perdre
Extra subtitle, attachment, chapter, or alternate audio tracks may be omitted when the target container or selected settings do not support them.
Efectes del còdec i la qualitat
Container names do not guarantee a codec. Quality and compatibility depend on the selected video codec, audio codec, bitrate, frame rate, and resolution.
Limitacions reals
A valid MKV extension does not guarantee that every codec inside the container is decodable. Corrupt, encrypted, or unusual streams can fail.

Passos de conversió

  1. Puja un fitxer MKV de fins a 1 GB.
  2. Confirma que MP4 està seleccionat com a format de destinació.
  3. Obre la configuració si necessites canviar el còdec, la taxa de bits, el volum o la retallada de l’àudio.
  4. Inicia la conversió. Un servidor compatible i en bon estat començarà a processar-la immediatament.
  5. Descarrega el fitxer MP4 i comprova el resultat abans d’eliminar l’original.

Resolució de problemes

El fitxer MKV es rebutja o no s’obre.
Comprova que el fitxer no sigui buit, protegit o malmès i que el format real coincideixi amb l’extensió.
El fitxer MP4 és més gran del que esperaves.
Tria una taxa de bits més baixa si necessites un fitxer més petit. Recorda que això pot reduir la qualitat de l’àudio.
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.

Privacitat i retenció de fitxers

Les pujades i els fitxers convertits es processen automàticament i s’eliminen de manera irreversible en un màxim de 24 hores. Pots eliminar-los abans amb el control de supressió. Convertr no llegeix, explota, ven ni revisa manualment el contingut dels fitxers.

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Alternatives útils

De MKV a AAC Fes servir aquesta opció si AAC s’adapta millor a l’aplicació, el còdec o el procés d’edició que necessites. De MKV a AIFF Fes servir aquesta opció si AIFF s’adapta millor a l’aplicació, el còdec o el procés d’edició que necessites. De MP4 a MKV Fes servir la conversió inversa quan necessitis tornar a la família del format original.