WebM to MP4 Converter

How to use WebM to MP4 Converter

1. Open WebM to MP4 Converter — it runs entirely in your browser with no setup.
2. Paste or type your input into the text area, or upload a file where supported.
3. Set any options you need. The result appears in the output panel — there is no upload step and no waiting on a server.
4. Review the output instantly; large inputs are handled locally without lag.
5. Copy the result to your clipboard or download it. Your data never leaves the page.

Why use WebM to MP4 Converter?

• 100% free with no limits, no sign-up and no watermarks.
• Private by design — your data are processed in your browser and never uploaded to a server.
• Fast and lightweight, with instant results even on a phone or a slow connection.
• Works everywhere — any modern browser on Windows, macOS, Linux, Android or iOS.
• Part of a full media studio suite, so related webm to mp4 tasks are one click away.

What people use WebM to MP4 Converter for

• Making a video downloaded from the web playable in desktop software.
• Converting a screen recording for editing or sharing.
• Preparing WebM footage for a platform that requires MP4.

WebM to MP4 Converter: limits and things worth knowing

• WebM holds VP8, VP9 or AV1 video, none of which MP4 conventionally carries, so this is always a re-encode to H.264 and never a simple remux.
• H.264 is less efficient than VP9 or AV1, so expect the MP4 to be larger than the WebM at similar quality — the trade is compatibility for size.
• Re-encoding is lossy. Converting back and forth repeatedly degrades the video each time.

Supported formats

Reads: WebM. Writes: MP4.

Is it private and secure?

Your privacy is built in. WebM to MP4 Converter runs completely on your device, so whatever you enter stays in your browser and is never transmitted, logged or stored on any server.

Network activity: none. Nothing is sent and nothing is fetched. This tool makes no network request at all once the page has loaded — which is why it keeps working if your connection drops.

You do not have to take that on trust — our privacy proof page publishes the Content-Security-Policy that enforces it, lists every third party it permits, and shows how to verify the whole claim yourself.

Learn more

Why Browser-Based Tools Are Safer for Your Files — Most online converters upload your files to a server. Client-side tools don't. Here's why that difference matters for privacy.