Sprite Outline AdderPixel Art Outline Generator for Sprites

The Sprite Outline Adder is a pixel art outline generator: drop a sprite or a whole sprite sheet and it adds an outline round every sprite, hard-edged and pixel for pixel. Put it outside the sprite or on its own edge, 1 to 8 px thick, with square corners, round ones or none, in one colour or in a darker shade of the sprite's own colours, and add a second outline round the first for a sticker or pickup look.

A sheet is outlined frame by frame, so one frame's outline never reaches into the next. The tool finds the frame size by itself, and Make room grows every frame by the outline's width so a sprite that touches its frame's edge isn't cut. Leave the holes inside a sprite alone or outline them too, and take a colour straight from your sprite with a click. Every setting shows at once, before and after, on a checker, dark, light or grass background.

Download the outlined PNG, the outline on its own for a hover or selection highlight you turn on in your game, and for a sheet a JSON of where every frame is now and a Godot 4 SpriteFrames to drop on an AnimatedSprite2D. Drop many sprites and they come back in one ZIP. It runs on your computer and never uploads your art.