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Convert a Video to MP4 or WebM, Free

Convert any MP4, MOV or WebM video to MP4 or WebM, right in your browser.

Most tools run entirely on your device

Select a video file

MP4, MOV or WebM — converted in your browser

Click to choose, or drop a file here

You can also paste (Ctrl+V / Cmd+V)

Most tools run entirely on your device

About converting between video formats

MP4 (H.264/AAC) plays on essentially everything — phones, editors, social platforms. WebM (VP9/Opus) is usually smaller and well-supported by browsers, but not universally by other apps or devices. This tool converts either way, whichever direction you need.

The video is decoded and re-encoded with WebCodecs, the browser's native hardware-accelerated codec API — entirely on your device, nothing uploaded. Like any re-encode, there's a small, normal quality trade-off; it isn't a lossless container remux.

Supported files

Accepts MP4, MOV or WebM. Produces MP4 or WebM, your choice.

Is my file uploaded?

No. Conversion happens entirely in your browser with WebCodecs — the video is never uploaded.

How to use the Video Converter

  1. 1

    Add your video

    Drop in the video you want to convert — it's read in your browser, never uploaded.

  2. 2

    Pick a format

    Choose MP4 (plays everywhere) or WebM (smaller, ideal for the web).

  3. 3

    Convert and download

    Click Convert; the video is re-encoded with the WebCodecs API and you download the result.

Video Converter — frequently asked questions

Is my video uploaded anywhere?+

No. It's decoded and re-encoded entirely in your browser with the WebCodecs API — nothing is sent to a server.

What's the difference between MP4 and WebM?+

MP4 (H.264/AAC) plays everywhere — every phone, editor and social platform. WebM (VP9/Opus) is usually smaller and is well-supported by browsers, but not by every app or device.

What input formats work?+

MP4, MOV and WebM. If your browser can decode it, this tool can convert it.

Does converting lose quality?+

There's a small, normal amount of re-encoding loss, same as any other browser-based video conversion — it isn't a lossless container remux.

Do you upload my files to a server?+

No — every tool here processes your files entirely on your device, and nothing is uploaded to a server. The only exception is the AI tools, which send the extracted text (not the file) to Claude to do their work.

Is there a file size limit?+

There's no artificial limit we impose, but since processing happens in your browser, very large files (500+ MB or 1,000+ pages) are limited by your device's memory rather than by us.