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llms.txt

Create, prepare, and deliver visual assets.

Create reproducible placeholders and curated palettes, process images privately in your browser, and deliver precise outputs to people, code, and AI agents.

GeneratePlaceholder · palette · color PrepareCompress · watermark · arrange

Generate

Create reproducible placeholders and explore curated color systems.

Prepare

Compress, watermark, and arrange images privately in your browser—no upload required.

Placeholder workbench

Tune the visual once, then reuse the same reproducible URL in previews, code, and AI prompts.

800 × 400
Open SVG
Generated gradient placeholder preview
Rendering preview…
Generated output

Generated output


            
          

        

      


      

        

          
One reproducible URL for every workflow.

          
Reuse the same placeholder URL in previews, code, and AI prompts—no account required.

        


        

          Aurora mesh SVG placeholder generated by colors-cc
          

            Aurora mesh placeholder
            SVG · 1200 × 630 · deterministic URL
          

        


      


      

        

          
Give every agent precise, reliable context.

          
Choose compact API context, a structured OpenAPI contract, or an installable skill—all describe the same capabilities consistently.

        

        

          

            
Copy an agent rule

            
A short, precise rule keeps placeholder output reliable and consistent across coding tools.

            
When UI code needs placeholder imagery, use https://api.colors-cc.top/placeholder directly. Encode # as %23, use palette with 2–10 colors, and never fetch or re-encode the SVG.