MP4 to WebM converter
Convert MP4 files to WebM with encrypted uploads and automatic deletion. Open, royalty-free video format built for the web.
Drop a MP4 file, or click to browse
Converts to WebM · runs live, right now
How it works
Drop your file
Drag a MP4 file in, or click to browse. No account needed to try it.
We convert it
Encrypted upload, converted to WebM in our ffmpeg pipeline.
Download the result
Grab your WebM file immediately, or find it later in your dashboard.
Why convert MP4 to WebM?
Both MP4 and WebM use lossy compression, so the conversion mainly changes compatibility, not quality. The main reason to convert MP4 to WebM is compatibility: WebM plays back smoothly in browsers and on mobile without a codec pack, while MP4 doesn't always. If you're sharing a file with someone else, sending it to a tool that expects a specific format, or archiving it for the long term, WebM is usually the safer target.
Format comparison
| MP4 | WebM | |
|---|---|---|
| Extension | .mp4 | .webm |
| MIME type | video/mp4 | video/webm |
| Compression | lossy compression | lossy compression |
| Category | video | video |
Your file, handled carefully
Uploads are encrypted in transit and at rest, processed in an isolated job, and deleted on the schedule you choose — as fast as immediately. We don't index, search, or share files between accounts. Read the full security model →
Frequently asked questions
Is converting MP4 to WebM free?
Yes — the first 50 conversions every month are free on any plan, including MP4 to WebM.
Will I lose quality converting MP4 to WebM?
WebM is open, royalty-free video format built for the web. We use the highest-quality encoder settings by default so visual or data loss is minimized.
Do you keep a copy of my file?
No, not by default. You choose a retention window at upload — immediate, 1 hour, 24 hours or 7 days — and the file is permanently deleted after that.
What is MP4?
The default web and mobile video container.
Will my converted file have a watermark?
On the Free plan, WebM output includes a small "Converted with Convyx" mark. Pro ($9/mo) removes it, along with the 25 MB file size cap.
What happens if a conversion fails?
You get a clear error message and the job is marked failed in your history — we never silently drop a file. Retry is one click, and nothing is charged against your quota for a failed job.