Which video format is best for compatibility?

MP4 (with H.264 video and AAC audio) is the most widely supported video format across Windows, Mac, iPhone, Android, and web browsers.

Are my video files sent to a server?

No. All conversion happens client-side in your browser using WebAssembly. Your files are never uploaded.

Home/Convert Video Format

Free · runs in your browser · no watermarks

Convert video format
100% locally.

Convert any video between MP4, WebM, MOV, AVI, and MKV. Re-encode or transcode to fix compatibility issues on phones, websites, or video players.

Input size

0 KB

Output size

0 KB

Format

Private Local Video Processing: Your videos never leave your device - all conversions run in your browser’s memory. No server uploads, no watermarks, no sign-up required.

Convert video format

Upload a video file, choose your target format and quality, and download the converted video.

Drop a video here, or click to browse

MP4 · WebM · MOV · AVI · MKV

Target Format

Quality Preset

How it works

Upload your video. Select any video file from your computer or phone.
Choose your target format. Select MP4 for general playback, WebM for web embedding, or MOV for Apple devices.
Convert & Download. The video engine processes the conversion in browser memory and generates a download link.

Common questions

Which video format should I choose?

MP4 is recommended for 99% of use cases. It plays natively on all operating systems, smartphones, smart TVs, and social media platforms.

Why convert to WebM?

WebM is an open, royalty-free format optimized for web browsers and HTML5 video backgrounds, offering high quality at small file sizes.

Is there a limit on file size?

The desktop tier supports up to 2GB files. Mobile devices are limited to 400MB due to memory safety rules.

Convert video format100% locally.