Simple Outline Shader 2D - Shader by Roam Moon

Simple Outline draws a clean, per-pixel outline around any SpriteRenderer. Add the component, pick a color, and the outline is there. There is no material to create, no shader to assign, and nothing to wire up. The effect reads the alpha channel of your sprite, so it works with any artwork you already have, without redrawing anything or authoring separate outline sprites. Everything is adjustable from a purpose-built Inspector. Thickness is measured in texture pixels so it stays predictable across sprite sizes. Sampling can run in 4 directions for a blocky, pixel-art look or 8 directions for rounder corners. The outline can sit outside the silhouette, inside it, or replace the sprite entirely for silhouette and highlight effects. A built-in sine pulse animates outline brightness without a single line of code. The outline color is an HDR color, so with Bloom enabled it glows. This makes it a natural fit for selection highlights, hover states, enemy telegraphs, pickup indicators, stealth and detection cues, and card or unit highlights in strategy games. It suits pixel art, hand-drawn and vector-style 2D alike. Every setting is also exposed as a C# property, so you can drive the effect from gameplay code in one line. The package ships with full source for both the shaders and the C# component, a demo scene, and an offline manual. Built-in Render Pipeline and URP are supported. HDRP is not supported, because HDRP has no 2D renderer and does not officially support SpriteRenderer.