Guides

Reference material for shipping a game on Steam: exact dimensions, what each asset is actually used for, and the requirements that are easy to miss until an upload is rejected.

• Steam capsule sizes: every dimension

  Every store and library capsule size from the Steamworks docs, the three sizes Steam retired in 2024, and what Valve asks for in each format.

• Steam store assets: the complete checklist

  Every image a store page needs before it can publish, with Valve's rules on what each may contain and a sensible order to produce them in.

• Sprite sheets: layout, frame counts and playback

  Grid layouts, how many frames an animation needs, why frames must share one crop box, and the playback speed that makes a walk cycle read correctly.

Generators

Every guide here pairs with a tool that produces the asset it describes:

• Steam capsule generator makes all nine store and library assets from one prompt.
• Game icon generator makes inventory icons and key art with transparent backgrounds.
• Character sprite generator makes sprites at platformer, isometric and top-down views.
• Sprite sheet generator builds animation sheets from an asset you already made.