Private local processing • No upload • Works in your browser

Bulk Video Format Conversion - Local Secure Conversion (No Upload)

Convert videos to the format you need. Change MKV to MP4 for compatibility, or MP4 to WebM for the web. Supports ProRes import. Fast, free, and private video conversion powered by WebAssembly.

What this video converter does

This tool helps you convert video files into another format directly in your browser. It is useful when a video is not compatible with a device, app, editing workflow, social platform, or upload requirement. Supports Apple ProRes import for professional video workflows.

How to convert a video

  1. 1.Upload your video file (MP4, WebM, MOV, MKV, ProRes, etc.)
  2. 2.Choose the target format (MP4, WebM, or MOV)
  3. 3.Adjust video codec, audio codec, bitrate, or sample rate if needed
  4. 4.Start the conversion in your browser
  5. 5.Download the converted file

Why use this online video converter

Better compatibility

Convert videos into formats that work better with devices, apps, or upload targets.

Private

Your files stay in the browser, which helps protect privacy during conversion.

Flexible settings

Use simple format conversion or refine output with codec and audio options.

ProRes support

Import professional Apple ProRes footage and convert to web-friendly formats like MP4.

Video converter FAQ

Which video formats can I convert?

You can convert between MP4, WebM, and MOV containers. Input supports MP4, WebM, MOV, MKV, and Apple ProRes encoded files.

Will converting video affect quality?

Video conversion can affect quality depending on the target format, codec, and output settings. This tool is designed to provide practical format conversion with clear export options.

Are my files uploaded during conversion?

No. Video conversion is processed locally in your browser, so your files stay on your device instead of being uploaded to a remote server.

Which video and audio codecs are supported?

Output supports H.264, H.265, VP8, VP9, AV1 for video, and AAC, Opus, MP3, Vorbis for audio. Input can also decode Apple ProRes.