Easily convert your WebM files to MP4 format online.
Drag and drop a video here, or click to select
Supported formats: MP4, WebM, MOV, MKV, AVI, FLV, M4V, MPG, MPEG, TS, M2TS, VOB, OGV, ASF, WMV, MTS, M2T, GIF
Select a WEBM video file, confirm MP4 as the output, and start the conversion. Media Tools runs FFmpeg in your browser, so the selected file is not uploaded to our application server. Processing time and practical file size depend on the codec, duration, available memory, and your device.
No converter can restore detail already removed by a lossy source. Choose an output that matches the device or workflow you need; repeated lossy conversions can reduce quality.
A file extension does not identify every internal codec. If conversion fails, try a shorter file, close memory-heavy tabs, or use a desktop FFmpeg build with broader codec support.
Actual decoding and encoding support depends on the codecs included in the bundled FFmpeg build.
Note: Conversion speed depends on your device's performance. For very large files, make sure you have enough free memory.
Convert WebM to MP4 when you need broad compatibility or to edit in tools that don’t support WebM. MOV to MP4 for sharing or uploading to platforms. MKV to MP4 for smaller size or device playback. Screen recordings, camera footage, and exports from editors often need a quick format change – this tool does it in the browser with no install.