How do I convert a WebM screen recording to MP4?

Drop the WebM recording into the page and start the MP4 preset. The converter changes WebM video and audio into H.264/AAC for wider editing and playback support.

Can iPhone play the converted WebM?

The MP4 result uses widely supported H.264 video and AAC audio and should play on current iPhone and iPad software.

Is WebM to MP4 conversion lossless?

No. VP8 or VP9 video is decoded and encoded as H.264. High Quality reduces visible loss but produces a larger MP4.

Does the WebM upload to a server?

No. FFmpeg WebAssembly performs the conversion inside the browser on your device.

WebM to MP4 Converter

Convert WebM to MP4 in your browser for free. Make browser recordings and web videos compatible without uploading your file.

Drop your WebM file here

or click to choose a file

MP4, MOV, AVI, MKV, WebM, WMV, MPG, VOB, TS, FLV, 3GP, HEVC and GIF

Conversion settings

Output format

QualityMaximum resolutionEncoding mode

WebM is efficient for websites and browser recordings, but many editors, presentation tools, Apple workflows, and messaging apps expect MP4. This preset converts VP8, VP9, or compatible WebM video to H.264 and converts Opus or Vorbis audio to AAC. The result is an MP4 designed for broad playback support. Select Fast when turnaround matters, or High Quality when text and fine detail in a screen recording must remain crisp. The source and result stay on your device.

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Free Video Converter for MP4, MOV, MKV, WebM and More

Zolkit's Video Converter changes video formats entirely inside your browser. Convert MOV to MP4, MKV to MP4, WebM to MP4, AVI to MP4, MP4 to WebM, video to GIF, and other common combinations without uploading the source to a server. FFmpeg WebAssembly uses your device's processor for private local conversion, while quality, resolution, and encoding controls let you choose between speed and file size.

Local and private

Video bytes stay on your device; conversion runs inside the browser tab with no media upload.

Fast encoding mode

The default fast preset uses more of your browser's available CPU to finish common conversions sooner.

Nine output formats

Export MP4, MOV, AVI, MKV, WebM, WMV, MPG, FLV, or an animated GIF from one converter.

Quality controls

Choose high quality, balanced output, or a smaller file and optionally cap resolution at 1080p, 720p, or 480p.

Preview before saving

Play compatible results or preview an animated GIF before downloading the converted file.

Free without watermarks

Convert videos without an account, subscription, queue, watermark, or server-side file limit.

How to Convert a Video Format

1
Drop a video onto the converter or click the upload area to choose MP4, MOV, AVI, MKV, WebM, WMV, MPG, VOB, TS, FLV, 3GP, HEVC, or GIF.
2
Choose an output format, quality, maximum resolution, and encoding mode. Fast and balanced settings work well for most videos.
3
Select Convert, keep the tab open while your browser processes the file, then preview and download the result.