Compress video for Discord

How it works

1. The page divides the size budget by the video’s length to get a bitrate, reserves a little for sound, and picks the largest resolution that still looks clean at that bitrate.
2. The page uses WebCodecs — the video encoder built into your browser and usually backed by your device’s hardware — instead of a 25 MB ffmpeg download.
3. The file is read from disk in pieces by Mediabunny inside a Web Worker, re-encoded to H.264 and packed into an MP4 that plays on iPhone, Android, Windows and in browsers.
4. If the encoder overshoots, it runs one more, tighter pass so the file lands under the limit.

Good to know

• Long videos don’t fit 20 MB at a watchable quality: roughly 3–4 minutes is the practical maximum. Trim first.
• Frame rate is capped at 30 fps to spend the budget on sharpness.
• Keep the tab open and the screen on. iOS pauses background tabs, so compression stops if you switch apps.
• On iPhone, files above roughly 600 MB can make Safari run out of memory. Use a computer for long 4K clips — or the app, which works with the whole library.
• HEVC (H.265) — the iPhone default — decodes in Safari and in Chrome or Edge on most Macs and Windows PCs, but not in Firefox.
• One video at a time.