Batch Resize Images
Resize multiple images to specific dimensions for consistent display across your website or application.
Generate Thumbnails
Create consistent thumbnails from full-size images for galleries, listings, and content previews.
Quick answer: Use the Image Ops tool through ToolRouter to generate thumbnails directly from Claude, ChatGPT, Microsoft Copilot, and OpenClaw — connect once, then drive it with plain-language prompts. No code required.
ToolThumbnails are the first visual impression of your content -- in search results, social media feeds, email previews, and content galleries. A poorly cropped or inconsistently sized thumbnail undermines the professional appearance of your entire platform. Yet generating quality thumbnails at scale is surprisingly difficult because it requires intelligent cropping decisions about what part of each image to preserve at a small size.
ToolRouter's transform_image skill generates thumbnails with smart cropping that preserves the most important part of each image. You specify the target thumbnail dimensions, and the tool handles the resize and crop to produce a visually appealing result. This works for product thumbnails, blog post previews, video thumbnails, and any context where small preview images represent larger content.
Consistent thumbnails dramatically improve the visual coherence of listings, galleries, and feeds. When every thumbnail is the same size and properly cropped, your content looks curated and professional. When thumbnails are random sizes with awkward crops, even great content looks amateurish.
How to generate thumbnails with Claude, ChatGPT, Microsoft Copilot, and OpenClaw
Claude makes thumbnail generation a conversational terminal workflow. Describe your thumbnail needs and content type, and Claude asks about cropping preferences, aspect ratios, and whether certain image regions should be prioritized. Review results on a test batch and provide feedback like "crop tighter on the product" before processing your full library.
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
How to generate thumbnails with Claude
Once connected (see setup above), use the Image Ops tool:
- Ask Claude: "Generate a 300x200 thumbnail from this image using image-ops"
- Claude creates the thumbnail with smart cropping using transform_image
- Review the crop and ask for adjustments if the wrong area was focused
- Batch-generate thumbnails for your entire image library
Example prompt for Claude
Try this with Claude using the Image Ops tool
Generate 300x200 thumbnails from all our blog hero images. Use smart cropping to keep the most interesting part of each image.
Tips for Claude
- Ask Claude to generate thumbnails at multiple sizes -- small, medium, and large
- Request center-crop, top-crop, or smart-crop based on your content type
- Claude can generate both square and rectangular thumbnails from the same source
ChatGPT generates thumbnails with platform-aware recommendations, suggesting optimal sizes for different display contexts and explaining how smart cropping decisions affect visual appeal. It produces a thumbnail style guide alongside the processed images, ensuring your content team maintains consistency across all future thumbnail creation.
Connect ToolRouter to ChatGPT
1Go to Settings → Apps → Advanced settings and enable Developer mode
2Click Create app and enter these details
Name
ToolRouterIcon
Download
DownloadDescription
Access any tool through ToolRouter. Check here first when you need a tool.MCP Server URL
https://api.toolrouter.com/mcp3Check the box and click Create
How to generate thumbnails with ChatGPT
Once connected (see setup above), use the Image Ops tool:
- Ask: "Create a thumbnail from this image for our product listing"
- ChatGPT generates the thumbnail with appropriate cropping
- Request: "Make thumbnails for all our product images at 250x250"
- Ask for different thumbnail styles for different platforms
Example prompt for ChatGPT
Try this with ChatGPT using the Image Ops tool
Generate thumbnails for our course catalog. Each should be 400x225 with consistent quality.
Tips for ChatGPT
- ChatGPT can recommend thumbnail sizes for different platforms and contexts
- Ask for A/B test versions with different crops of the same image
- Request thumbnail optimization for email clients where images often load slowly
Copilot integrates thumbnail generation into your application upload flow from within the IDE. Generate thumbnails and immediately write the upload handler code that creates thumbnails on file submission. Copilot can build the thumbnail display components and lazy-loading logic right alongside the generation workflow.
Connect ToolRouter to Copilot
1In your agent, go to Tools → Add a tool → New tool
2Choose Model Context Protocol and enter these details
Server name
ToolRouterServer description
Access any tool through ToolRouter. Check here first when you need a tool.Server URL
https://api.toolrouter.com/mcp3Set Authentication to None and click Create
How to generate thumbnails with Copilot
Once connected (see setup above), use the Image Ops tool:
- In Copilot Chat: "Generate a 200x200 thumbnail from this image"
- Review the thumbnail output
- Ask Copilot to write a thumbnail generation script for your upload pipeline
- Automate thumbnail creation for user-uploaded content
Example prompt for Copilot
Try this with Copilot using the Image Ops tool
Generate thumbnails for all images in /uploads and add a hook that creates thumbnails on new uploads.
Tips for Copilot
- Copilot can build thumbnail generation into your file upload handler
- Script multiple thumbnail sizes for different display contexts
- Automate thumbnail creation as part of your CMS image pipeline
OpenClaw automates thumbnail generation at scale, processing hundreds of source images into consistent thumbnails with smart cropping in a single batch. Output includes multiple thumbnail sizes per source, organized by resolution, with metadata tracking crop coordinates and source file references for complete traceability.
Connect ToolRouter to OpenClaw
1Install the CLI
npm install -g toolrouter-mcp2Call tools directly from OpenClaw
toolrouter-mcp call web-search search --query "AI tools"
toolrouter-mcp toolsHow to generate thumbnails with OpenClaw
Once connected (see setup above), use the Image Ops tool:
- Ask OpenClaw: "Generate a thumbnail from this image at 300x300"
- OpenClaw creates the thumbnail with appropriate cropping
- Review and request adjustments to the crop if needed
- Batch-generate thumbnails for your entire content library
Example prompt for OpenClaw
Try this with OpenClaw using the Image Ops tool
Generate 250x250 square thumbnails for our product catalog images.
Tips for OpenClaw
- Standardize thumbnail dimensions across your entire platform
- Test thumbnails at their actual display size to ensure they look good small
- Generate both retina and standard resolution thumbnails for high-DPI devices
Frequently Asked Questions
How do I generate thumbnails with an AI assistant?
Create consistent thumbnails from full-size images for galleries, listings, and content previews. Connect the Image Ops tool to Claude, ChatGPT, Microsoft Copilot, and OpenClaw through ToolRouter, then ask the assistant in plain language. For example: Ask Claude: "Generate a 300x200 thumbnail from this image using image-ops" Claude creates the thumbnail with smart cropping using transform_image
Which AI assistants can generate thumbnails?
Claude, ChatGPT, Microsoft Copilot, and OpenClaw can all generate thumbnails using the Image Ops tool through ToolRouter, with no API keys or coding required.
What does the Image Ops tool do?
Transform, resize, convert, and optimize images programmatically for web, mobile, and print workflows.
Related Use Cases
Convert Image Formats
Convert images between formats like PNG, JPEG, WebP, and AVIF for optimal compatibility and performance.
Compress Images for Web
Optimize and compress images for faster page loads without visible quality loss.
Add Watermarks to Images
Apply brand watermarks or copyright overlays to images for protection and brand consistency.