Audio & video

Convert video to MP4 or WebM

Convert a compatible MP4, MOV, AVI, WMV, WebM or MKV video to MP4 or WebM on your device. Browser-engine codec support, processing time and available memory vary by file.

No server upload No signup Up to 100 MB per file

Drag files here

This tool processes one file at a time.

MP4, MOV, AVI, WMV, WEBM, MKV · Up to 100 MB per file

Local browser processing — Source files are not sent to our server for conversion.

How to convert a video

Choose a current output container and let this device do the work.

Select one MP4, MOV, AVI, WMV, WebM or MKV file.
Choose MP4 or WebM as the output and review the memory guidance.
Start conversion and keep the browser tab open until processing completes.
Download the result and verify playback, audio, duration and visual quality.

Video formats contain different codecs

MP4, MOV, AVI, WMV, WebM and MKV are containers; each file can carry a different video and audio encoding.

MP4, MOV, AVI, WMV, WebM or MKV video: MP4, MOV, AVI, WMV, WEBM, MKV
MP4 or WebM video: MP4, WEBM

MP4 is commonly used for playback, publishing and mobile compatibility.
WebM is designed for the web, but the destination app and source codecs should still be checked.

Match a video to its destination

Convert when a player, browser or upload form does not accept the original container.

Creating an MP4 copy of an older AVI or WMV file.
Preparing WebM media for a compatible web project.
Standardizing personal video files before using them in another application.

Local video work can be demanding

Transcoding uses processor time and temporary memory, and it can change quality, size or playback characteristics.

Close other heavy tabs before processing a large, long or high-resolution video.
Do not delete the original until you have watched the downloaded result in the target app or device.

No remote video conversion

Supported video conversion runs in the local browser engine instead of sending the source to a remote converter.

Only documented static engine assets are fetched; the selected file, filename and extracted metadata are not added to those requests.
Cancel processing or clear the job to release temporary file data held by this tab.

FAQ

Frequently asked questions

Why can a listed video format still fail?

The container may use an unsupported codec, profile, protection method or damaged structure. The extension alone cannot guarantee decoding.

Which output is better, MP4 or WebM?

MP4 is usually the broader compatibility choice. WebM is useful for supported web workflows; test the result in its destination.

Can I convert a very large video on a phone?

It may fail because mobile browsers have tighter memory and lifecycle limits. A desktop browser and a smaller source are more reliable.