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WebM to MP4 Converter

Convert WebM videos to MP4 format for maximum compatibility across devices and platforms.

What this tool does

WebM to MP4 Converter helps you convert WebM videos to MP4 format for maximum compatibility across devices and platforms.

What you get

WebM to MP4 Converter produces a direct output in this page and keeps all processing on your device, with nothing uploaded to our servers.

Free to use, no watermarks, runs in your browser—nothing uploads to our servers

Source file *

Files are processed locally in your browser using WebAssembly. This input is required.

Saved FFmpeg presets (stored locally)

Saved presets

Preset name

Quality (CRF)

Lower = better quality (0-51, default: 23)

Video Bitrate

Target bitrate (e.g., 500k, 1000k, 2000k)

Report a bug

If this tool misbehaves, share a quick summary so we can investigate. We include the tool URL automatically—no need to copy and paste.