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WEBM→MP4

WebM to MP4

WebM to MP4 is a free online video converter for changing WEBM files into MP4 files. WebM to MP4 accepts 1 MIME type, returns video/mp4, includes 1 setting, and runs in your browser on the device.

Drop .webm file here

or click to choose

Options

Key facts

Input
1 format: WEBM (video/webm)
Output
MP4 (video/mp4)
Runtime
your browser on the device
Settings
1 control: Quality (CRF)
File mode
1 input file creates 1 output file
Cost
$0, no account required

How to use WebM to MP4

  1. 1

    Open your WEBM file

    Drop your WEBM file onto the page, or click to browse and pick one from your device.

  2. 2

    Choose options

    Adjust the conversion options to suit your needs. Defaults work well for most inputs.

  3. 3

    Convert and download

    Click Convert. Your MP4 file is ready to download in seconds.

WebM to MP4 details

First, WebM to MP4 reads WEBM source files and prepares MP4 output for the video workflow. Next, The visible controls are Quality (CRF). Additionally, Files and text stay in the browser session.

Re-encode a WebM file as an MP4 with H.264 video and AAC audio; the most universally playable video format, supported by every phone, TV, and editor. The conversion runs locally via ffmpeg.wasm, so your file never leaves your browser. Performance depends on your CPU: expect roughly real-time encoding for short clips (a 5-minute 720p video may take 1;2 minutes). Sources taller than 1080p are automatically downscaled to 1080p so the browser does not run out of memory mid-encode; for best results keep inputs under about 500 MB.

Common searches

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Related tools

Tools that work with the same formats — most users open one of these next.

VideoOnline

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AVI to MP4

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MOV to MP4

Convert MOV (QuickTime) video to MP4 (H.264 + AAC) — free online.

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Frequently asked

What is WebM to MP4?

WebM to MP4 is a free online video converter for changing WEBM files into MP4 files. WebM to MP4 accepts 1 MIME type, returns video/mp4, includes 1 setting, and runs in your browser on the device.

What files does WebM to MP4 accept and create?

WebM to MP4 accepts WEBM files (video/webm) and creates MP4 files (video/mp4). The page includes 1 setting: Quality (CRF).

Do my files and data stay private?

Yes. WebM to MP4 runs entirely in your browser using your device's CPU. Files and text are never uploaded to our servers, so your data stays private.

How do I use WebM to MP4?

Open WebM to MP4, drop in your WEBM file, choose any options, and click Convert. Your browser does the work locally and produces a MP4 file you can save right away.

What is the maximum file size for WebM to MP4?

Because WebM to MP4 runs in your browser, the maximum size depends on your device's available memory. Most modern phones and laptops handle files up to a few hundred MB without issues.