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WebM to MP4 Converter

Convert WebM files to MP4 format instantly. Fast, free, and secure online video converter.

Drag & drop or click to upload

Supports .webm files

Result Preview

Converted MP4 video will appear here

Powered by FFmpeg WebAssembly. All processing happens locally in your browser.

How this WebM to MP4 Converter works

Our WebM to MP4 Converter transforms open-source WebM video files into the universally compatible MPEG-4 (MP4) format. WebM files are common on the web but can be problematic for playback on iPhones, older devices, and some video editing software. This tool solves that compatibility issue instantly.

We use the industry-standard H.264 video codec and AAC audio codec during conversion to ensure maximum compatibility. The process runs entirely in your browser using WebAssembly technology, meaning your files are never uploaded to our servers.

Because no server upload is required, conversion starts immediately and is often much faster than cloud-based alternatives, especially for larger files. Once finished, you can verify the results with the built-in video player before downloading your new MP4 file.

How to Use

1

Upload WebM

Drag and drop or select your WebM file.

2

Convert

Click to convert your video instantly.

3

Download MP4

Get your converted MP4 file.

Frequently Asked Questions

How do I convert WebM to MP4 on iPhone?
iPhones do not natively play WebM. Use our free online converter to transform your WebM file into MP4, which is fully supported by iOS Photos and media players.
Is there a file size limit for WebM conversion?
Because conversion happens locally in your browser, there is no arbitrary server upload limit. Performance depends mainly on your device processing power and RAM.
Will converting WebM to MP4 reduce quality?
Our tool re-encodes the video to MP4 (H.264), aiming for high fidelity. While any re-encoding can technically alter quality, the results are typically excellent and visually indistinguishable.
Why use MP4 instead of WebM?
While WebM is great for the web, MP4 is the universal standard for offline playback, editing software, and sharing on social media platforms like Instagram and TikTok.
Is this WebM to MP4 converter secure?
Yes. Unlike other sites that upload your video to a cloud server, our tool converts your file directly on your computer or phone, ensuring your data remains private.

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The WebM to MP4 Converter is maintained by CodeItBro. We aim to provide the best free developer tools on the web. If you have feedback or suggestions, please visit our contact page.

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