Your AI agent can resize images — but only if it has a tool to call. Uploading a 4K screenshot into Claude's context wastes tokens and hits size limits. The fix: give your agent a resize-image API it can hit with one curl command.
Agent Media Tools exposes POST /api/resize-image as a free REST endpoint. No API key needed for basic use. Here's how to wire it into human workflows and autonomous agents.
Common scenarios where LLMs need to resize images:
Without an API, the agent asks the human to "please resize this manually." With an API, it just does it.
The fastest test — resize a local image to 800px wide and save as WebP:
curl -X POST https://agentmediatools.com/api/resize-image \ -F "image=@photo.jpg" \ -F "width=800" \ -F "format=webp" \ -o resized.webp
Supported formats: JPEG, PNG, WebP, AVIF. Pass width and/or height — aspect ratio is preserved if you only set one dimension.
Try it in the browser too: free online image resizer.
import requests
with open("photo.jpg", "rb") as f:
r = requests.post(
"https://agentmediatools.com/api/resize-image",
files={"image": f},
data={"width": "1200", "format": "webp"},
)
r.raise_for_status()
with open("output.webp", "wb") as out:
out.write(r.content)
Drop this into a cron job, n8n workflow, or LangChain tool — same endpoint, same result.
Copy this into your agent's system prompt or a one-shot task:
Resize images by POSTing to https://agentmediatools.com/api/resize-image with multipart form data: field "image" (file), "width" (pixels), optional "format" (jpeg|png|webp|avif). No auth required. Save the binary response as the output file.
Every tool page on Agent Media Tools has a Copy Prompt button with a pre-filled version of this.
For native tool calling in Claude Desktop, install the MCP extension or add the SSE server to your config:
{
"mcpServers": {
"agent-media-tools": {
"transport": "sse",
"url": "https://agentmediatools.com/api/mcp",
"headers": { "Authorization": "Bearer YOUR_API_KEY" }
}
}
}
Claude then gets resize_image as a first-class tool — no curl parsing required.
Batch processing and async jobs are available on Premium for overnight pipelines.
Try it now: Resize an image free · API docs · Agent hub
Eric builds AI tools at agentmediatools.com. More guides: blog · llms.txt