Pixel Art Outline Generator
Add a clean, pixel-perfect outline to any sprite: outer or inner, open or closed corners, any color. Free, no signup.
Runs in your browser on Retro Diffusion's Rust engine. Your images never leave your device.
Drop an image here, click to browse, or paste
PNG · JPG · WebP · GIF, up to 16 megapixels
Outline Generator, step by step
- 01
Load a sprite
Any sprite with a transparent background. Enlarged sprites are brought back to their real 1× pixels first, so the outline is one true pixel.
- 02
Outer or inner
Outer draws around the shape; inner recolors the sprite’s own edge pixels, keeping its size.
- 03
Corners and width
4-connected outlines skip diagonal corners for a softer, classic look; 8-connected closes every corner.
- 04
Download
Save at 1×. With “Grow canvas” on, the image gets room for the outline so nothing is clipped.
Generate real pixel art from a prompt
Retro Diffusion's models draw on a true pixel grid with a limited palette: characters, tilesets, animations and more, from $0.03 an image. New accounts start with free balance.
Outline Generator FAQ
Drop a sprite with a transparent background, pick the outline color, and choose outer or inner. The outline follows every transparent edge, including holes inside the shape.
A 4-connected outline only touches pixels above, below and to the sides, leaving diagonal corners open, which many pixel artists prefer. An 8-connected outline also fills the diagonals for a solid, closed line.
If the sprite touches the edge of the image there is no room for an outer outline. Keep “Grow canvas” on and the image is enlarged by the outline width on every side.
Yes, free with no signup. It runs in your browser on Retro Diffusion’s Rust engine; nothing is uploaded.