PNG.now MCP Server for ChatGPT

io.github.chrisyau83/png-now

Compress PNG images and convert them to or from popular image and document formats.

client:ChatGPT transport:streamable-http tools:4

Install PNG.now MCP Server in ChatGPT

Settings → Connectors → Advanced → Developer mode

https://png.now/mcp

Custom connectors are a paid-plan feature and take a remote URL only. ChatGPT cannot run a packaged server locally. ChatGPT docs