• ASPECT
  • SCALING
  • VISUAL
  • HUMAN

How to test responsive layouts with your AI

Connect DummyImage to your AI client to create placeholder assets. Once connected, you can request specific dimensions to see how your UI handles different aspect ratios.

Ask AI about this page

Short answer

How can I use AI to test responsive layouts?

Ask your AI to generate images with specific widths and heights using DummyImage. This lets you drop exact aspect ratios into your containers to see if your design breaks on mobile or desktop. You'll see the specific outcomes below.

Testing outcomes

What you get from these images

The AI handles the image generation so you can focus on the layout.

ASPECT

Ratio verification

The AI uses generate_image to create assets that match your width and height requirements. You can check if a 16:9 image or a 1:1 square fits your container.

SCALING

Container behavior

By using specific dimensions, you can see if your CSS handles image scaling correctly. This helps catch overflow issues before you commit to final assets.

VISUAL

Placeholder accuracy

The AI produces clean, dimensionally accurate placeholders. This ensures your layout testing is based on real spatial constraints.

HUMAN

Manual layout tweaks

The AI provides the images, but you still need to adjust your CSS or grid settings. You decide how the layout responds to the assets the AI creates.

The workflow

What your AI does when the request arrives.

The AI handles the heavy lifting of dimension calculation and asset creation.

  1. Parse dimensions

    Your agent reads your request for a specific size, like a 400x600 portrait image. It extracts these numbers to prepare the tool call.

    generate_image

  2. Execute generation

    The AI calls the tool to build the image with the exact requested width and height. This ensures the placeholder is the right size for your test.

    generate_image

  3. Deliver asset

    The AI provides the image link or data back to your chat interface. You can then use this to populate your local development environment.

    generate_image

  4. Refine requirements

    If the container looks cramped, you tell the AI to try a different ratio. It repeats the process with the new constraints.

    generate_image

Try it

Copy these to start.

Use these prompts to get moving immediately.

Starting points

Swap out the dimensions and descriptions to match your specific UI needs.

DummyImage Connector

You're all set. Choose your MCP client and follow the setup instructions.

Connector linkhttps://edge.vinkius.com/vk_preview_xgR0gtQvOX80CEAieHXAS1z32eTZNMWEdskeVYiy/mcp

Claude Desktop

Follow the steps below to connect in seconds.

  1. 1In Claude Desktop, open Settings → Connectors.
  2. 2Click “Add custom connector” and paste the connector link above as the remote MCP server URL.
  3. 3Click Add and start a new chat — DummyImage capabilities are ready to use.
Configuration · claude_desktop_config.jsonCopy
{
  "mcpServers": {
    "dummyimage-mcp": {
      "url": "https://edge.vinkius.com/vk_preview_xgR0gtQvOX80CEAieHXAS1z32eTZNMWEdskeVYiy/mcp"
    }
  }
}
Copy into chat04

  • Generate a 1920x1080 placeholder image for a hero banner.

  • I need a 1:1 square image that is 500x500 pixels for a product card.

  • Create a 300x600 vertical image to test a sidebar container.

  • Generate a 400x200 image to see how my mobile grid handles wide aspect ratios.

  • Claude
  • ChatGPT
  • Cursor
  • VS Code
  • Windsurf
  • Claude Code
  • JetBrains
  • Cline

Start here

Connect DummyImage once, then ask.

Just click the link to connect the MCP to your client. Your credentials stay encrypted, and you can start generating images right away.

Connect DummyImage to your AI

FAQ

How this task behaves

  • 01

    Can the AI change my CSS code directly?

    No. The AI only generates the images. You must manually apply the images to your code or design files.

  • 02

    Does the AI generate real photographs?

    No. This tool is for generating dimensionally accurate placeholder images for layout testing.

  • 03

    Can I request specific colors for the placeholders?

    Yes, you can include color preferences in your prompt, and the AI will attempt to include them in the generated image.

  • 04

    Will the AI save these images to my hard drive?

    No. The AI provides the images through the chat interface. You are responsible for downloading or saving them.

  • 05

    Can the AI create animated GIFs?

    No. The tool is limited to static images for testing aspect ratios and scaling.

  • More questions about DummyImage? The Connector page answers them. See everything the DummyImage Connector can do

Connect DummyImage to Claude, Cursor, ChatGPT & more