Video Converter

Convert videos between different formats

Choose Video File

Supports MP4, MOV, AVI, WebM, MKV

Convert videos between popular formats for maximum compatibility. Convert MOV (iPhone/Mac) to MP4 for universal playback, WebM to MP4 for broader device support, or any format to your preferred output. Our tool supports MP4, MOV, WebM, AVI, MKV, and more. Choose output quality and format settings to match your specific needs. All processing happens locally in your browser using FFmpeg WebAssembly—your videos stay private on your device. No file size limits, no watermarks, and no registration required.

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 100% private and doesn't require high-speed internet to upload large video files to a server.

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 MKV 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.

Unlike traditional converters, our app uses your device's hardware. (1) The video file is mapped into your browser's memory. (2) The FFmpeg.wasm engine decodes the source stream. (3) It applies the selected output parameters, such as resolution scaling or bitrate adjustments. (4) It encodes the data into the target container. This process leverages multi-threading and SharedArrayBuffer technology to maximize speed. Since the data remains in a 'local blob' throughout the process, your privacy is mathematically guaranteed.

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/Lossless	Old Hardware

To convert high-resolution video (1080p/4K), we recommend a modern desktop browser (Chrome, Edge, or Firefox). Safari is supported for basic conversions, but multi-threading is limited due to WebKit restrictions. Ensure your device has at least double the RAM of the file size you are converting for the best experience.

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.