A stream overlay is just an image (or a short animation) that sits on top of your gameplay or webcam. Most overlay packs — including ours — come as PNG files with a transparent background, sized to match a standard streaming canvas. Here's exactly how to get one into OBS.
Go to Settings > Video and check your Base (Canvas) Resolution. Most overlay packs are built for 1920x1080. If your canvas is a different size, the overlay will look cropped or stretched.
In your Scene, click the + under the Sources box and choose Image for a static PNG, or Media Source if your overlay is an animated .gif or .webm. Name it something clear, like "Main Overlay", and browse to your file.
With the source selected, right-click it in the Sources list and choose Transform > Fit to Screen — this snaps a full-canvas overlay perfectly into place. For smaller elements (like a webcam frame), drag the red corner handles instead.
OBS renders sources top-to-bottom, with the topmost item in the list appearing in front. Your overlay should usually sit above your Game Capture and Webcam sources, but below any Alert Box or Chat Box widgets. Drag sources up/down in the list until it looks right.
Once it's positioned, right-click the source and select Lock. This stops you from accidentally dragging or resizing it mid-stream.
Grab a ready-made overlay pack and skip the design work — browse the Stream Mask store. Go to the store