LIHA Tools

MP4 to WebM Converter

Convert MP4 video to WebM in a browser-only batch. Files, streams, metadata, and results are never uploaded.

Files stay in this browser tab and are never uploaded. Up to 250.0 MiB per file and 10 files.

Common output settings

Advanced video, audio, and stream settings

Lower CRF values preserve more detail and usually create larger files.

The private batch workspace is ready. Video encoding becomes available after the verified browser engine is loaded.

How MP4 to WebM conversion works

MP4 probe and decode → stream-aware conversion → WebM verify

Reading MP4

MP4 input is probed for its video, audio, subtitle, chapter, rotation, color, metadata, and encryption streams before conversion.

Creating WebM

WebM output uses VP9 video and Opus audio with only verified WebM-compatible streams.