# Convert to WEBM

> Browser-only file conversion. Selected files are processed on this device and are not uploaded to a conversion server.

Source: https://localconverter.tech/to-webm

Create WEBM (WebM VP9) output from a supported source using this browser workspace. Choose the source format below to open a converter with its own settings, example and output limitations.

## How do I convert a file to WEBM?

Open a supported conversion below, select the original file, review the available options and select Convert. Download the result before its temporary job expires. Play the result in the destination player. Check orientation, duration, audio synchronisation and the chosen resolution. Re-encoding changes quality and size; changing a file extension alone does not convert its contents.

## Supported sources for WEBM

- [MP4 to WEBM](https://localconverter.tech/mp4-to-webm.md)
- [MOV to WEBM](https://localconverter.tech/mov-to-webm.md)
- [MKV to WEBM](https://localconverter.tech/mkv-to-webm.md)

## Explore the opposite direction

- [WEBM source conversions](https://localconverter.tech/webm-converter.md)

## Questions

### Does WEBM conversion require a remote upload?

Files, pasted text and generated results are processed in this browser. They are not uploaded to a conversion server. Engine downloads can require internet access; large operations depend on the memory and CPU available on this device.

## Related information

- [All tools and conversion pairs](https://localconverter.tech/tools.md)
- [Supported file formats](https://localconverter.tech/formats.md)
- [How local conversion works](https://localconverter.tech/how-it-works.md)
- [File privacy and temporary storage](https://localconverter.tech/privacy.md)
- [Local processing security](https://localconverter.tech/security.md)
- [Terms of use](https://localconverter.tech/terms.md)
- [Conversion help](https://localconverter.tech/help.md)