Private browser-based conversion

Video Converter

Convert videos between MP4, WebM, MKV, and MOV formats. Hardware-accelerated encoding. Tell us your use case and we'll pick the best settings.

No upload required MediaBunny + Web Workers Free to use

Quick recommendation

Choose MP4 + H.264 when you need the widest compatibility. WebM is a good choice for modern websites and smaller downloads.

1. Add your videos

Drop one or more files here. You can add more before starting the batch.

Drop videos here or click to browse

MP4, MOV, WebM, MKV, AVI — up to 2GB

Processed locally

Your files stay in this browser. MediaBunny runs the conversion in local Web Workers, so nothing is sent to a server.

What are you using this for?

Pick a common goal to apply a practical format, codec, and quality preset in one click.

What are you using this for?

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Video format guide

Convert between the formats people use most

Convert common camera, phone, screen-recording, and downloaded videos in your browser. Choose the container based on where the finished file will be played or shared.

mp4

Most compatible

Best default for phones, social platforms, presentations, and general sharing.

webm

Web delivery

A modern browser-friendly container, often useful when download size matters.

mkv

Flexible archive

Useful when you want a flexible container for multiple tracks and high-quality storage.

mov

Apple workflows

A practical choice for QuickTime, Final Cut, and Apple-oriented workflows.

How to convert a video online

The complete workflow runs in your browser and the result is ready to preview before downloading.

  1. 01

    Add a video

    Drop an MP4, MOV, WebM, MKV, AVI, or another supported video file into the converter. Batch conversion is available too.

  2. 02

    Choose the output

    Select a target container, compatible codec, quality level, frame rate, or custom dimensions. Use a use-case preset if you are unsure.

  3. 03

    Convert and download

    Start the local conversion, preview completed files, retry individual failures, and download one file or a ZIP batch.

Common video conversion scenarios

The right output depends on the destination. These practical defaults cover the most common reasons people convert a video.

Maximum compatibility

Use MP4 with H.264 when the video must work across browsers, phones, messaging apps, and presentation software.

Website and landing page

Use WebM for modern web playback, or MP4 when you need a reliable fallback for a broader range of devices.

Phone and social sharing

Choose MP4 with a lower quality preset for smaller uploads. HEVC can save space on newer devices, but is less universal.

Storage and archive

Choose MKV and a higher quality preset when preserving detail and multiple media tracks matters more than file size.

Your videos stay on your device

The browser reads your files and passes them to local Web Workers powered by MediaBunny. The source and converted video are not uploaded to MediaKit servers. Remove files or close the tab when you are done to release local object URLs.

FAQ

Frequently asked questions

Are my videos uploaded?

No. Conversion runs in your browser with MediaBunny and Web Workers. The selected files are not sent to a MediaKit server.

Which input and output formats are supported?

You can add common formats including MP4, M4V, MOV, WebM, MKV, AVI, WMV, FLV, 3GP, MTS, M2TS, TS, OGV, DIVX, and XVID. Outputs are MP4, WebM, MKV, and MOV.

Should I choose MP4 or WebM?

Choose MP4 for the widest compatibility. Choose WebM for modern browsers and web delivery when a smaller file is more important than legacy device support.

Will converting reduce video quality?

Re-encoding can change quality. Start with Medium or High, keep the original resolution when possible, and preview the result before sharing it.

How large can a video be?

Each input video can be up to 2 GB. Large files need enough free memory and may take longer on phones or older computers.

Can I convert videos on a phone?

Yes, on a current browser. Keep the page open during encoding and choose a lower quality or resolution if the device becomes warm or runs low on memory.

Learn more

Related video guides and tools

MP4 vs WebM: which format should you use?

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