How it works
Complete the job in three clear steps
- Choose or enter a WebM video.
- Set the available options and create an MP4 video.
- Review and download the result before leaving the page.
Private Lucaden video & audio tool
WebM to MP4 Converter
Convert WebM footage to H.264 MP4 for broader device and presentation compatibility.
Free to use Your source stays on this device; FFmpeg WebAssembly processes it in temporary browser memory.
Loading tool workspace…
Important
Check the result before relying on it
Keep an untouched copy of important source files. Browser processing depends on available device memory, and you should inspect every downloaded result before deleting the original.
Practical details
What this Lucaden tool does
Convert WebM footage to H.264 MP4 for broader device and presentation compatibility.
Lucaden creates a separate result and leaves the original unchanged. Browser memory and device performance set practical limits for very large files.
Included capabilities
- VP8/VP9 input where supported
- H.264 output
- Optional audio
- Fast-start MP4
Useful for
- Convert browser recordings
- Insert video into slides
- Share with older devices
- Prepare an MP4 upload
Questions
About this tool
Why can it take longer than the clip duration?
The browser decodes and re-encodes every frame using your device CPU.
Is the source uploaded?
No. FFmpeg runs in browser memory.
Open-source foundations
Built transparently
Lucaden documents its standards sources, architectural references, and permissive runtime dependencies while keeping this workspace consistent with the Lucaden interface.