Convert MP4 to WebM

Convert MP4 to WebM for smaller, web-native video on your own website.

No login requiredFiles stay private

Drop files here, or click to browse

MP4, WebM, MOV, AVI, MKV, Video no file size limit

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Your files never leave your device. All processing happens locally in your browser.

WebM tips

🌐

WebM (VP9) is the web-native format — it tends to be smaller than H.264 MP4 at the same quality, ideal for self-hosted web video.

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Pair a WebM source with an MP4 fallback in your <video> tag so every browser, including iOS Safari, has something to play.

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VP9 encodes slowly in the browser. For long HD clips, expect a wait — it's doing real encoding on your CPU.

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Encoding happens locally, so unreleased web assets never leave your machine.

Choose File

Drop your file into the tool above. It stays entirely on your device — nothing is sent to any server.

Process

The tool processes your data instantly in your browser using JavaScript. No server, no waiting.

Download

Get your result instantly. Nothing is stored after you leave the page — complete privacy.

✓Completely free — no hidden costs, ever

✓No account, email, or login required

✓Files never leave your device

✓No file size limits whatsoever

✓No watermarks on any output

Convert WebM to MP4

Turn a WebM video into MP4 so it plays on iPhones,

Convert MOV to MP4

Convert iPhone/QuickTime MOV recordings into unive

Convert MKV to MP4

Convert MKV files into MP4 for players and devices

Convert Video for Editing

Convert clips into a format your editing software