Breaking

Open-source 'Image Extender' launches, extending 2D game art via Gemini

July 1, 2026 at 10:56 EDT

Media Generation
Open Source
Software Dev & Coding

Developer boona13 (Ibrahim Boona) has released Image Extender, an open-source web app on GitHub that offers seamless AI image extension (outpainting) alongside a pipeline built specifically for 2D game art. It taps Google's Gemini image models through OpenRouter to help produce consistent parallax backgrounds, autotiles and sprites.

Open Source · by boona13

Image Extender: from outpainting tool to a full 2D game-art studio

A locally-run, Next.js web app that seamlessly extends any image with AI — and generates entire game-ready asset packs: parallax backgrounds, autotiles, sprites and props, in engine-ready formats.

integrated workspaces in one pipeline

export targets: Unity, Godot, Phaser, Tiled

40+

custom art styles, one shared scene brief

Output volume per action — bigger column, more assets

Extender
best-of-3

Parallax
4 layers

Props
8 at a time

Tile
autotile set

The five workspaces

Extender

Seamless extension in any direction · best-of-3 · Poisson blending

Parallax Studio

4-layer parallax · 3840–15360px presets · ZIP (PNG + manifest)

Tile Studio

13-tile autotile as 4×4 sheet · 14 materials · 2px extrude atlas

Sprite Studio

5 body plans · animation sheets via 2-pass

Props Studio

8 at a time · art director→painter pipeline · transparent PNG

How generation works

Base image or prompt

→

Gemini image model (BYOK)

→

Best-of-N + seam QA

→

Engine-ready export

Models switchable: Gemini 3 Pro Image · Gemini 3 Flash Image · Gemini 2.5 Flash

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