MP4 を WebM に変換

Free online MP4 to WebM converter. Fast, secure, no signup required.

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Accepted: MP4 files · Max 100 MB per file

mp4 webm

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Need to convert MP4 to WEBM? MegaConvert makes it easy. Upload your MPEG-4 Part 14 (MP4) file and get a WebM Video (WEBM) file in seconds — no software to install, no signup required. Whether you need this conversion for social media, video editing, device compatibility, web streaming / archival, our online converter handles it instantly. Free for files up to 25MB, with support for larger files up to 2GB.

How to Convert MP4 to WEBM Online

1
Upload your MP4 file
Click the upload area or drag and drop your MP4 file. Files up to 25MB are free. Larger files are supported with pay-per-use.
2
Choose WEBM as output format
WEBM is automatically selected on this page. You can adjust conversion settings if needed.
3
Click Convert
Hit the Convert button to start processing. Your file will be converted using our high-performance servers.
4
Download your WEBM file
Once conversion is complete, click Download to save your new WEBM file. Free files are available for 1 hour.

Why Convert MP4 to WEBM?

**Better efficiency** — WEBM offers improved compression and quality compared to older formats, reducing file sizes while maintaining fidelity.
**Optimized for web** — WEBM is designed for web use, offering faster loading times and better browser support.
**Reduce file size** — Converting between formats can significantly reduce file size, making files easier to share via email or cloud storage.
**Software requirements** — Your software or platform may require WEBM format specifically. Converting ensures full compatibility.

MP4 vs WEBM — Format Comparison

Feature	MP4	WEBM
Full Name	MPEG-4 Part 14	WebM Video
Developer	Moving Picture Experts Group (MPEG)	Google
First Released	2001	2010
Category	Video	Video
Extension	.mp4	.webm
MIME Type	video/mp4	video/webm

Re-encoding video may reduce quality. Use MKV for lossless container conversion.

About MP4 Format

Most widely used video container format supporting H.264, H.265, and multiple audio codecs.

Full name: MPEG-4 Part 14

Developer: Moving Picture Experts Group (MPEG) (2001)

About WebM Format

Open royalty-free media format designed for HTML5 video using VP8/VP9 codecs.

Full name: WebM Video

Developer: Google (2010)

よくある質問

Upload your MP4 file to MegaConvert.io, select WEBM as the output format, and click Convert. Your converted file will be ready to download in seconds. No software installation required.

Yes! Files up to 25MB can be converted for free, up to 3 times per day. For larger files, pay-per-use pricing starts at just $2 for files up to 100MB.

Absolutely. All uploaded files are encrypted in transit (HTTPS), scanned for viruses, and automatically deleted after conversion. We never share or access your files.

Free users can convert files up to 25MB. Pay-per-use supports files up to 2GB. Subscribers get up to 2GB with priority processing.

Most widely used video container format supporting H.264, H.265, and multiple audio codecs. Developer: Moving Picture Experts Group (MPEG) (2001).

Open royalty-free media format designed for HTML5 video using VP8/VP9 codecs. Developer: Google (2010).