How it works
- 1Upload MP4, MOV, WEBM, or MKV
- 2Choose MP4 or WEBM
- 3Run conversion
- 4Preview and download
VoiceKitNeed a true alpha channel?Free online tool
Free online video converter
Upload a video and download MP4 or WEBM.
Use this when a site only accepts MP4, or you need a WEBM for the web.
Convert video format
Drop a video, choose MP4 or WEBM, then convert.
- MP4
- MOV
- WEBM
- MKV
Ready — drop a file below.
Why use this page
MP4 for sharing
H.264 + AAC with faststart for browsers and chat apps.
WEBM for the web
VP8 + Opus when you specifically need WEBM.
Same media stack
Uses VoiceKit ffmpeg conversion — no desktop install.
FAQ
Will this also compress the file?
It re-encodes to the target format. For a smaller MP4 with resolution presets, use the compress-video tool.
MKV to MP4?
Yes. Upload MKV and pick MP4.
Can this make a transparent video?
No. H.264 MP4 has no alpha channel, and this converter’s WEBM is opaque. Use the transparent-video tool for VP9 WebM with alpha or ProRes 4444 MOV.