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About this tool
Work out facecam, alert and chat overlay pixel sizes and safe-area positions for any stream canvas and output resolution.
This calculator turns an overlay element expressed as a percentage of your stream canvas into exact pixel dimensions and top-left X/Y coordinates. It applies the canvas-to-output scale factor (output width ÷ base width) that OBS and Streamlabs use, and reserves a safe margin off the short edge so nothing sits under a platform's own chrome. Streamers and overlay designers use it to size facecams, chat boxes and alert boxes once and reuse them at every resolution.
Open Stream Overlay Size Calculator on AltFTool — it loads instantly in your browser.
Enter the values you already know.
Fine-tune the options to match your scenario.
Read the result and use it in your planning or reporting.
Size once as a share of canvas width and the layout survives a resolution change.
X and Y are given for all nine safe-area anchors in canvas pixels.
Flags mismatched aspect ratios and artwork that would be stretched past 100%.
A common facecam is about 25% of canvas width, which is 480 × 270 px on a 1920 × 1080 canvas at 16:9. Small corner cams run nearer 16% (about 307 × 173 px) and full-frame 'just chatting' cams can exceed 50%.
The base (canvas) resolution is the coordinate space you position sources in; the output (scaled) resolution is what is actually encoded. OBS multiplies everything by output width ÷ base width, so a 1920 canvas sent out at 1280 is scaled to 0.67×.
Around 5% of the short edge is the usual working figure — 54 px on a 1080-tall canvas. That keeps elements clear of player controls, follower banners and platform watermarks that overlap the frame edges.
Export at least at the element's canvas pixel size (1×). Exporting at 2× is worth it if you may raise the canvas later or the element contains fine text, because upscaling a raster PNG always softens edges while downscaling does not.
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