Video Format Converter

Convert MP4, WebM, MOV, or AVI videos in your browser, with format-specific playback and compatibility warnings.

Drag & drop a video here

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Supports MP4, MOV, AVI, WebM, AVI

Processed privately in your browser — your files never leave your device.

Convert MP4, WebM, MOV, or AVI videos online and choose a format suited to playback, editing, or sharing.

What is Video Format Conversion?

Video conversion is the process of changing the container (like .mov or .webm) and the codec (like H.264 or VP9) of a video file. This is often necessary because different operating systems and social media platforms support different standards. For example, while Apple devices favor MOV, the web and Android prefer MP4 or WebM. Our tool utilizes FFmpeg compiled to WebAssembly, allowing your own computer to handle the complex transcoding math. This means the conversion is processed locally and doesn't require high-speed internet to upload large video files to a server.

Common Video Conversion Scenarios

iPhone (MOV) to Universal MP4

Apple devices record in MOV format which can sometimes cause playback issues on Windows or older smart TVs. Converting to MP4 ensures your family videos or professional recordings play everywhere.

WebM to MP4 for Social Media

Many web-based screen recorders save in WebM. However, platforms like Instagram and LinkedIn often require MP4. Convert your clips in seconds to ensure a smooth upload.

Reducing File Size for Email

Convert high-bitrate AVI or AVI files to efficient H.264 MP4s to reduce file size without a noticeable drop in visual quality, making them easier to share via email or Slack.

Legacy Format Recovery

Breathe new life into older AVI or WMV files by converting them to modern formats compatible with today's smartphones, tablets, and web browsers.

The Tech Behind In-Browser Transcoding

The converter decodes a supported video and encodes it as MP4, WebM, MOV, or AVI. Choose the target format for playback or editing; codec compatibility and browser-memory warnings can vary by file.

Video Format Compatibility Matrix

Format	Compatibility	Quality/Size	Best For
MP4 (H.264)	Universal (99%)	Excellent Balance	Social Media, Web
WebM	Browsers/Android	High Efficiency	Web Graphics
MOV	Apple Ecosystem	Professional/High	Video Editing
AVI	Legacy Windows	Large/Stream-copy	Old Hardware

Technical Requirements

Supported videos are converted in the browser. Larger or high-resolution files may need more memory, and playback support can vary by format and device.

Frequently Asked Questions

Which format should I choose?

MP4 (H.264) is the most universally compatible - works on virtually all devices and platforms. WebM is smaller but has limited support on Apple devices. MOV is best for Apple ecosystem. AVI is legacy format, avoid unless specifically needed.

Why convert MOV to MP4?

MOV files from iPhones/Macs may not play on Windows, Android, or web browsers. Converting to MP4 ensures your videos play everywhere. The conversion preserves quality while improving compatibility.

Will I lose quality during conversion?

All video conversion involves some level of re-encoding. However, we use high-quality CRF (Constant Rate Factor) settings to ensure that the visual difference is virtually imperceptible to the human eye.

Is there a file size limit?

There is no hard limit set by our tool, but your browser's memory (RAM) is the limiting factor. We recommend files under 1GB for smooth processing on most computers.