Convert WebM to MP4 Online — Free WebM to MP4 Converter

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Convert WebM to MP4 — Share Browser Videos Everywhere

WebM is great for browsers, but useless almost everywhere else. Your phone, TV, social media accounts, and most video editors will not play WebM files. Converting to MP4 gives you a universally compatible video you can share, upload, or edit anywhere. Klipa handles the VP8/VP9-to-H.264 conversion on our servers, so it works even on older devices.

Got a screen recording to share? Convert it here, then compress the MP4 for email-friendly sizes. Need captions on your tutorial? Our AI subtitle generator transcribes and burns in captions automatically.

How to Convert WebM to MP4

Step 1

Upload Your WebM File

Drag and drop your WebM file — screen recordings, browser exports, or any WebM video up to 5 GB on Pro (500 MB without an account). We support both VP8 and VP9 encoded WebM files.

Step 2

H.264 MP4 Encoding

Our server converts the VP8/VP9 video stream to H.264 and the Opus/Vorbis audio to AAC, producing a universally compatible MP4 file. Quality settings are optimized to preserve visual fidelity at the smallest possible file size.

Step 3

Download Universal MP4

Your MP4 plays on every device and platform. Upload to YouTube, share on WhatsApp, import into video editors — it just works. Want to enhance it? Add AI subtitles or compress further for faster sharing.

Why Convert WebM to MP4?

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Share Everywhere

WebM only works in browsers. MP4 plays on phones, TVs, and all social platforms.

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Quality Preserved

Converts VP8/VP9 to H.264 with optimal quality settings.

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Screen Recordings

Perfect for converting Chrome/Firefox screen recordings to shareable MP4.

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No Software Needed

Convert directly in your browser. No VLC or third-party software required.

FROM BROWSER TO EVERYWHERE

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WebM to MP4 — FAQ

WebM is Google's open video format used mainly by web browsers. It uses VP8/VP9 codecs and is not widely supported outside browsers.

Most devices, apps, and social platforms don't support WebM. MP4 is the universal standard that works everywhere.

Yes! Chrome and Firefox screen recordings are often saved as WebM. Our tool converts them to MP4 for easy sharing.

Minimal. We use high-quality H.264 encoding that preserves the visual fidelity of your WebM video.

The limit depends on your plan: 500 MB without an account, more with a free account, up to 5 GB on Pro.

The time depends on the file size, duration, source codec, and chosen format.

Chrome uses WebM as its native recording format because it is open-source and royalty-free. For sharing outside the browser, converting to MP4 with our tool ensures universal playback.

MP4 does not support transparency. If your WebM has an alpha channel, the transparent areas will be rendered as black in the MP4 output. For transparent video, keep the WebM format.

We use high-quality H.264 encoding settings that preserve the visual fidelity of your WebM. Any quality difference is imperceptible to the human eye. For the absolute smallest file, run the result through our compressor.

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Convert your WebM to MP4 now

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WebM to MP4 — Universal Compatibility

Stop being limited by WebM's browser-only playback. Klipa converts your WebM files to universally compatible MP4 quickly — free, online, with no signup required. Pair it with our compressor, AI subtitles, and video converter for all your video format needs.