1. Home
  2. >
  3. Ummy Converter
  4. >
  5. MP4 to WebM

MP4 to WebM

Re-encode MP4 to modern WebM in seconds—perfect for websites, apps, and email embeds.

or drag & drop up to 100 MB here

By using our service you accept our Terms of Service and Privacy Policy.

How to convert MP4 to WebM online

1. Upload your MP4

1. Upload your MP4

Click “Choose files” or drag a video onto the page. HD and 4K clips up to 100 MB travel over encrypted HTTPS.

2. Pick WebM settings

2. Pick WebM settings

WebM is pre-selected. Choose VP9 for top quality at smaller sizes or VP8 for wider legacy support, then tweak bitrate or resolution in Advanced settings.

3. Download the WebM

3. Download the WebM

Press “Convert”. In seconds your optimised .webm file is ready—embed it with the HTML5 <video> tag or share it anywhere.

FAQ

Why convert MP4 to WebM?

WebM offers better compression, is royalty-free, and plays natively in modern browsers—ideal for web developers and CMS platforms.

Which codec should I choose, VP8 or VP9?

VP9 gives higher quality at lower bitrates but needs newer browsers (Chrome 29+, Firefox 28+). VP8 is slightly larger yet supports older devices.

Can WebM carry transparent video?

Yes. VP9 supports an alpha channel. Enable “Transparency” in Advanced settings to export WebM with a clear background.

Will converting lower my video quality?

Quality depends on bitrate. Keep Auto for a balanced result or raise the bitrate in Advanced settings for near-lossless output.

Does WebM play on Safari or iOS?

Safari on macOS 11+ supports VP9 WebM. Older Safari and iOS browsers need an MP4 fallback—serve both formats with multiple <source> tags.

What’s the maximum upload size?

Up to 100 MB per file. Larger projects should be trimmed or down-scaled before upload.

How are my files kept private?

Transfers use encrypted HTTPS. Files are processed only in volatile memory and are automatically deleted minutes after conversion.

Try our converter

M
M

MP4 to MP3

Convert MP4 to MP3 and save crisp, high-bit-rate audio in seconds

M
G

MP4 to GIF

Turn any MP4 clip into a lightweight, share-ready GIF animation

M
W

MP4 to WAV

Transform MP4 into WAV and download lossless, studio-quality sound

M
M

MP4 to MOV

Convert MP4 videos to MOV for seamless playback on all Apple devices

M
A

MP4 to AVI

Change MP4 to AVI for smooth viewing on virtually any media player

M
W

MP4 to WEBM

Convert MP4 to WEBM and optimize videos for fast, bandwidth-friendly streaming

M
W

MP4 to WMV

Switch MP4 to WMV for flawless compatibility with Windows PCs

M
M

MP4 to M4A

Extract pure M4A audio from MP4 files for iOS-ready listening