Convert STP to ICO
Convert STP to ICO online: the 3D part drawn as a see-through isometric wireframe, saved as a 256 × 256 ICO icon. Free, no sign-up.
Drop your STP files here
Up to 50MB per file.
Conversion Settings
Files are encrypted and auto-deleted after conversion
How to Convert
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Upload your STP files
Drag and drop or select STP files from your device. You can upload multiple files at once.
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Configure Output
Choose any available ICO output options, then start the conversion.
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Download ICO files
Once conversion finishes, download your files individually or as a compressed ZIP archive.
Why convert STP to ICO?
STP is the common .stp extension of STEP (ISO 10303), the standard format for exchanging solid 3D models between CAD and manufacturing software. Every edge of the model, front and back, is projected into an isometric view and drawn as dark lines on a white background, giving a clear wireframe of the part.
ICO output is a 256 × 256 pixel Windows icon: the image is scaled to fit with its proportions kept, and the surrounding space is transparent.
Frequently Asked Questions
How do I convert STP to ICO?
Drop your STP file above and press Convert. Our servers open the STP model with FreeCAD, trace every edge into an isometric line drawing, and render it through a PDF page into the image you chose. The result is saved as a 256 × 256 ICO icon, ready to download.
Are hidden edges of the STP part shown in the ICO?
Yes. The drawing is a see-through wireframe, so edges at the back of the part are drawn along with the visible ones, which reveals holes and pockets on every side.
Does a STP assembly with several bodies come through in the ICO?
Yes. FreeCAD reads the file's complete shape, so every body it contains is drawn together in the same isometric view.
Which part of the STP becomes the ICO icon?
The first page of the rendered content is used for the icon, fitted inside the 256 × 256 square with its proportions kept.
What size is the ICO made from a STP file?
The icon is 256 × 256 pixels, the largest standard Windows icon size. The image is fitted inside the square with its proportions kept and a transparent surround, stored as a PNG-compressed icon.
Is my .stp file kept private?
Your file is uploaded over an encrypted connection, converted on our servers and deleted automatically within 24 hours. We never read, share or keep your files, and no account is needed.