Convert Your WebM Videos to MP4 Convert WebM video files to MP4 format directly in your browser.

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WebM to MP4 Converter

Convert WebM video files to MP4 format directly in your browser.

Upload WebM

Drag and drop your WebM file or click to browse.

Convert to MP4

Click Convert to transform your WebM into MP4 format.

Download Your MP4

Download your converted MP4 file instantly.

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What Is WebM to MP4 Converter?

The WebM to MP4 Converter is a free browser-based tool that converts WebM video files into the universally compatible MP4 format. MP4 (MPEG-4 Part 14) is the most widely supported video format across devices, operating systems, and media players. This tool processes everything locally in your browser using canvas-based frame capture and MediaRecorder API. Your files never leave your device, ensuring complete privacy. The conversion is ideal for making web-optimized WebM videos playable on iOS devices, older media players, and platforms that don't support WebM natively.

Why Use WebM to MP4 Converter?

MP4 is universally compatible with all devices and players
All processing stays in your browser — fully private
No software installation or signup needed
Perfect for sharing videos on social media and messaging apps

Common Use Cases

Device Compatibility

Convert WebM files for playback on iOS, Android, and other devices that prefer MP4.

Social Media

Prepare videos in MP4 format for uploading to social media platforms.

Video Editing

Import WebM files as MP4 into video editing software that requires MP4 input.

Presentations

Embed MP4 videos in PowerPoint, Keynote, or Google Slides.

Technical Guide

This tool loads the WebM video using an HTML5 Video element, captures frames via a Canvas element, and re-encodes the output. Since browsers natively support WebM playback, the video is decoded frame-by-frame and drawn onto a canvas. The canvas stream along with any audio stream is fed to MediaRecorder. While true MP4 (H.264) encoding is not available via MediaRecorder in all browsers, the tool outputs in the best compatible format available (typically WebM with broad compatibility, or MP4 where supported). For production-quality MP4 encoding, ffmpeg.wasm can be used. Audio is captured via Web Audio API's MediaStreamDestination and merged with the video stream.

Tips & Best Practices

1
For best compatibility, use this tool in Chrome or Edge browsers
2
Keep source videos under 100MB for optimal performance
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The output format depends on your browser's MediaRecorder support
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For professional MP4 encoding, consider using ffmpeg.wasm

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Frequently Asked Questions

Q Why convert WebM to MP4?

MP4 is universally supported across all devices and platforms, while WebM may not play on iOS or some media players.

Q Is the conversion lossless?

Re-encoding involves some quality change. The tool uses the browser's best available encoder for good quality output.

Q Are my files uploaded anywhere?

No. All processing happens locally in your browser. Your files remain completely private.

Q Can I convert large files?

Yes, but large files (>200MB) may be slow. Processing speed depends on your device's capabilities.

Q Does it work on mobile?

Yes, but conversion may be slower on mobile devices due to limited processing power.

About This Tool

WebM to MP4 Converter is a free online tool by FreeToolkit.ai. All processing happens directly in your browser — your data never leaves your device. No registration or installation required.