Convert 3D models and images from your AI chat

3D Model and Image Conversion by imagetostl.com is a free MCP connector. It lets AI apps such as Claude, ChatGPT and Cursor convert 3D models and images for you, using the same converter tools as this website. There is no sign-in and no account.

Just ask in your chat, for example "convert this 3MF to STL", and the AI app starts the conversion and gives you a download link.

Server URL

https://mcp.imagetostl.com/mcp

It uses the Streamable HTTP transport and needs no authentication.

Add it to your AI app

Claude

Open Settings, then Connectors.
Choose Add custom connector.
Enter a name, such as 3D Model and Image Conversion, and the server URL https://mcp.imagetostl.com/mcp.
Save it, then turn it on in a chat.

To convert a file you attach in Claude, Claude needs to upload it to us. Turn on code execution and allow network access to mcp.imagetostl.com in Claude's settings. If you would rather not, Claude can give you an upload link to open in your browser instead, or you can give it a public link to the file.

ChatGPT

Open Settings, then Apps & Connectors.
Create a new connector using the server URL https://mcp.imagetostl.com/mcp, with no authentication.
Turn it on in a chat.

ChatGPT passes files you attach as temporary links, so attachments work without any extra setup.

Cursor and other coding agents

Add this to your mcp.json:

{ "mcpServers": { "imagetostl-3d": { "url": "https://mcp.imagetostl.com/mcp" } } }

Coding agents upload local files themselves by running the curl command the connector gives them.

Other AI apps

Any app that supports remote MCP servers over Streamable HTTP can use the server URL above with no authentication.

How it works

The AI app sends us your file, either as a public link or as an upload.
We convert it on our servers.
The AI app gives you a link to download the result.

If your AI app can't upload the file itself, it gives you a single-use upload link to a page on imagetostl.com. Open the link, choose your file, then go back to your chat and say it is uploaded. The link expires after 10 minutes.

Tools

list_formats lists the formats the connector supports and which conversions are available.
create_upload_link creates a single-use upload link for a file, with an upload page and a curl command.
start_conversion starts a conversion from a public link or an uploaded file.
get_conversion checks a conversion and returns the download link when it is finished.
delete_conversion deletes the conversion's files straight away.

Limits

Uploaded files can be up to 50 MB.
Files given as a link can be up to 100 MB.
One file per conversion.
Images convert to other image formats. Images can't be converted to 3D models with this connector.
STEP files can be converted from, but not to.
When a lot of people are using it, your AI app may be asked to wait a few seconds and try again.

Your files

Uploaded files are deleted once they have been converted. Converted files are deleted within 4 hours, or straight away if you ask your AI app to delete them. We don't receive your chat, and the connector sets no cookies. See the privacy policy for the details.

Supported formats

Not every input converts to every output. Your AI app checks which conversions are available before it starts.

3D model inputs (35)

3DS, 3MF, AMF, ASE, BLEND, CTM, DAE, FBX, GCODE, GLB, GLTF, LDRAW (LDR, MPD), LWO, LWS, OBJ, OFF, PCD, PDB, PLY, PMD, PMX, PTX, STEP (STP), STL, TILT, U3D, USD (USDA, USDC), USDZ, VOX, VTK, VTP, WRL, X, X3D, XYZ

3D model outputs (24)

3DS, 3MF, ABC, AMF, ASE, BLEND, CTM, DAE, FBX, GLB, GLTF, OBJ, OFF, PCD, PLY, STL, USD, USDZ, VTK, VTP, WRL, X, X3D, XYZ

Image inputs (54)

APNG, ARW, AVIF, BMP, CR2, CR3, CUR, DCM, DDS, DNG, DPX, EXR, FAX, GIF, HDR, HEIC, HEIF, ICO, JFI, JFIF, JP2, JPEG, JPG, JPG_LARGE, KTX, KTX2, NEF, PBM, PCX, PFM, PGM, PICT, PNG, PNM, PPM, PSB, PSD, QOI, RGB, RGBA, SGI, SUN, TGA, TIF, TIFF, UYVY, WBMP, WEBP, WPG, XBM, XCF, XPM, XWD, YUV