Export formats and troubleshooting
All three formats are encoded inside your browser. Nothing is uploaded, which also means your browser decides which codecs are available.
The three formats
| Format | How it is made | Good for | Limits |
|---|---|---|---|
| MP4 (H.264) | MediaRecorder captures the canvas in real time at 8 Mbps | Sharing in chat apps and social uploads | Not every browser can record H.264; the tool tells you when yours cannot |
| WebM (VP9) | Same real-time capture with the VP9 codec | Web embeds, smaller files at the same quality | Some video editors and older devices reject WebM |
| GIF | Encoded frame by frame in the page with a 256-color palette | Short loops that autoplay anywhere | Capped at 30 fps, scaled to at most 720 px wide, and files grow quickly with duration |
Export settings
Frame rate accepts 1 to 60 fps and duration accepts 1 to 120 seconds. MP4 and WebM record in real time, so a 10-second export takes about 10 seconds. GIF encoding is not real time: each frame is drawn, quantized to 256 colors, and written one by one, with progress shown in the status line.
For MP4 and WebM you can attach an audio file, which is looped for the length of the clip. GIF has no audio.
Common problems
"MP4 export is not supported in this browser."
Your browser cannot record H.264 through MediaRecorder. Switch the format to WebM, or run the export in a Chromium-based browser or Safari and try MP4 again.
The export button is grayed out
Load an image or video first. The button stays disabled until media is loaded, and while another export is running.
GIF encoding is slow
Encoding runs on your CPU, one frame at a time. Shorten the duration, lower the export frame rate, or use a smaller source image. A 10-second GIF at 30 fps is 300 frames.
GIF colors look banded
GIF holds at most 256 colors per frame, so smooth gradients band. That is a format limit. Export WebM or MP4 when your source has gradients or photographic color.
There is a label in the corner of my export
That is the watermark toggle in the preview controls. Turn it off before exporting if you do not want the "GRID NOISE" stamp.
Which one should I pick?
MP4 if you plan to send the clip to someone or post it. WebM if it goes on a web page you control. GIF only when the clip is a few seconds long and has to loop without a video player. When in doubt, export MP4 and keep the source image so you can re-export later. Set up the effect itself with the settings guide.