How to Turn a Napkin Sketch into Concept Art with Claude
Turn a Napkin Sketch into Concept Art with Claude and ToolRouter. Convert rough sketches into polished concept art for games, films, and creative pitches.
Tool
Claude is ideal for concept art generation when you want to iterate on the visual style and get feedback on what is working before committing to a final direction. Claude can run multiple style interpretations and help you articulate what makes one version better than another.
Connect ToolRouter to Claude
1Open connector settings Open Settings
2Add a custom connector with these details
Name
ToolRouterURL
https://api.toolrouter.com/mcp3Let Claude set you up Open Claude
Steps
Once connected (see setup above), use the Sketch to Render tool:
- Share the sketch and describe the intended style, tone, and context — for example, 'dark fantasy, painterly style, heavily armoured warrior'.
- Ask Claude to run `render` via the sketch-to-render tool.
- Ask Claude to describe what visual choices it made and whether the result matches the intended tone.
- Request a style variant — grittier, more stylized, different lighting — for comparison.
- Use the final render in your pitch document, game design doc, or creative brief.
Example Prompt
Try this with Claude using the Sketch to Render tool
Use sketch-to-render to turn this rough character sketch into concept art for a dark fantasy game — heavy plate armour, battle-worn, standing in dim torchlight. Tell me whether the visual tone matches a Soulsborne aesthetic and suggest one adjustment to make it feel more distinct.
Tips
- Reference a specific visual style or comparable work — the model interprets tone better with a concrete reference.
- Ask Claude to describe the lighting and material choices so you can articulate the design intent to collaborators.
- Concept art from a napkin sketch is most valuable as a communication tool in the early pitch phase — it does not need to be final.