About WebM video format

WebM is an open, royalty-free video format optimized for the web. It uses VP8 or VP9 video codec and Opus audio codec. WebM files can be played in Chrome, Firefox, Edge, and VLC. For broader compatibility you can convert the file to MP4 using a tool like HandBrake or FFmpeg.

Browser and platform compatibility

Format	Chrome	Firefox	Edge	Safari	iOS	Android
WebM (VP8/VP9 + Opus)	✓	✓	✓	✓ (v16+)	✓ (iOS 16+)	✓
MP4 (H.264 + AAC)	✓	✓	✓	✓	✓	✓
OGG (Theora)	✓	✓	✓	✗	✗	✓

WebM is recorded directly by the browser's MediaRecorder API on all modern platforms. If you need to share the file with iPhone/Mac users on older OS versions, convert to MP4 first.

Your webcam footage never leaves your device

The MediaRecorder API stores recorded chunks in browser memory. No video data is transmitted to any server at any point. The download is a direct file save from local memory to your device's storage.

Recording tips for quality

Lighting is the most important factor: face a window or ring light. A backlit face produces poor quality regardless of camera resolution.
USB webcam vs. built-in: external USB webcams (Logitech C920, Elgato Facecam) typically offer better sensors, wider apertures, and sharper lenses than built-in laptop webcams.
Background: a plain wall or tidy background looks more professional than a cluttered space.
Microphone: built-in laptop microphones pick up keyboard noise; a USB microphone or headset significantly improves audio quality.

Converting to other formats

The recorded WebM file can be converted to MP4 or other formats using FFmpeg:

ffmpeg -i input.webm -c:v libx264 -c:a aac output.mp4

HandBrake provides a free GUI alternative for users who prefer not to use the command line.

Bitrate and quality settings

720p video at 2–4 Mbps produces good quality for most web use cases. 1080p recording typically requires 6–10 Mbps to avoid visible compression artefacts. To reduce the bitrate of a converted file with FFmpeg:

ffmpeg -i input.webm -c:v libx264 -b:v 2M output.mp4