Convert WebM videos to MP4 for playback on iPhone, Safari, editing software and platforms that do not support WebM. Processing runs locally in your browser.
拖放文件到此处，或
MP4 · MOV · WebM · MKV · AVI
WebM is common on the web but not supported by all players and editors. Convert to MP4 (H.264) for universal playback on any device or platform.
Pick a quality preset or fine-tune resolution and bitrate. Balance visual fidelity against file size for your specific use case.
Your WebM file is decoded and re-encoded on your device. Nothing is uploaded, making it safe for private or work recordings.
Convert WebM files from screen recorders and webcam tools to MP4 for sharing and editing.
Browser recordingsMake WebM videos playable on iPhone, iPad and Mac where native WebM support is limited.
Apple device playbackImport WebM clips into editing software that requires MP4 input.
Video editing关于此工具、支持流程和本地浏览器处理的常见问题回答。
Yes. LessMB converts WebM to MP4 for free in your browser with no account or upload.
iOS and some Android players lack native WebM support. Converting to MP4 (H.264) solves playback on virtually all devices.
It depends on video length, resolution and device performance. Short clips typically convert in under a minute.