Convert Video Online

Convert MP4, MOV, WebM or MKV to MP4 or WebM in your browser.

Supported files: MP4, MOV, WEBM, MKV · One file, up to 200 MB

Quality

Smaller videos are not enlarged. Subtitles, extra tracks and HDR may not be kept.

Only codecs your browser supports can be converted.

  • Free
  • No sign-up
  • No file upload

Example result

Example settings: Quality Balanced · Maximum long edge 1280 px
Before · source.mov846.1 KB
After · video-converter-1.mp4692.7 KB

Convert Video Online · How to use this tool

  1. Choose a video.

  2. Pick MP4 or WebM, then set the quality and maximum long edge.

  3. Play the result and download it.

Choose a video format for your destination

MP4 output uses H.264 video and AAC audio. WebM uses VP9 or VP8 video and Opus audio. Pick the format accepted by the app or site where you will use it.

The video is re-encoded even when the extension stays the same, so keep the original.

Supported files

MP4, MOV, WEBM, MKV → MP4 / WebM

  • One file, up to 200 MB
  • Total output: 150 MB
  • Maximum duration: 10 minutes
  • Maximum video resolution: 3840×2160 · 4096 px

Frequently asked questions

Can every MP4, MOV, WebM or MKV be converted?

No. The extension describes the container, while the internal codec must also be readable and decodable in this browser.

Can I convert several videos at once?

Each run processes one video. Download the result, then choose the next file.

Does the video converter keep multiple language tracks and subtitles?

No. It uses the primary video and, when selected, primary audio track. Additional tracks and subtitles are not copied.

How does this converter handle portrait phone videos?

It applies the input's rotation to the output frames. The size limit refers to the longer displayed edge, so a portrait video stays portrait.

Are my files uploaded to a server?

No. Files are processed in your browser on this device and are not sent to BlurMe servers.

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MKV → MP4

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