Convert
MP4 to WEBM
Convert MP4 video to WebM. WebM plays in every modern browser, but not in most desktop players or on TVs, while MP4 plays essentially everywhere: browsers, phones, TVs, and editors. Container and codec are handled together, so what comes out is a file that genuinely opens rather than a renamed extension. Runs on your own Vistalyth Tools instance. Files never reach a third party.
Features
- Reads what is actually inside the MP4, rather than trusting the extension
- Bitrate and resolution control, or a stream copy when the codecs already line up
- Audio carried across and re-encoded only when it has to be
- Your MP4 files are processed on your own server and never uploaded anywhere
What you can do
- Make a MP4 recording playable on a device or site that rejects it
- Standardise mixed-format footage on WEBM before editing
- Re-wrap a MP4 for upload without re-shooting or re-exporting
Self-hosted. Your files never leave your network.
Vistalyth Tools runs entirely on your own infrastructure. Files processed with MP4 to WEBM are never uploaded to third-party servers. Deploy a single Docker container and process files with full privacy, no watermarks, and no usage limits. Open source under AGPL-3.0.
Frequently asked questions
- Does converting MP4 to WEBM reduce quality?
- An MP4 source is already H.264 or H.265 in almost every case, so moving it into another container is frequently a straight stream copy that costs nothing in quality and finishes in seconds. Where a re-encode is needed it is a real one, so start from the best source you have.
- Why target WEBM?
- Pick WebM for video you serve from your own pages, where you control playback and want smaller files with no licensing questions attached.
- How long does it take?
- A stream copy takes seconds. A full re-encode is bound by your CPU or GPU and scales with length and resolution. Progress is reported live while it runs.
Ready to try MP4 to WEBM?
Deploy Vistalyth Tools in under a minute. All 243 tools included. Open source and free forever.