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STP STEP
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Convert STP to STEP

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Verified by Adam B.· reviewed by FE Editorial ·updated Sep 5, 2026
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Is it possible to convert STP to STEP?
Yes - STP converts to STEP.

You can do it right here with our free converter - no sign-up, and your file is deleted right after.

STP and STEP are the same file format; rename model.stp to model.step and any CAD application will open it immediately. No geometry or metadata is lost because the file content does not change. The only exception is when a receiving system requires a specific application protocol (AP203 or AP242) declared in the file header - in that case, re-export from a CAD tool.

Also to STEP: MODEL · X_B · X_T

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Tested on macOS, Windows & Linux
Last verified Sep 2026

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Why convert STP to STEP?

People search for an STP-to-STEP converter when the receiving software, upload form, or PDM system checks the file extension and rejects .stp even though the content is identical. Both extensions refer to .STEP - ISO 10303-21, the standard for exchanging precise B-rep geometry and assembly data between CAD systems. The only practical reason to re-export rather than rename is if a system requires a specific application protocol (AP203 or AP242) declared in the file header.

How to convert STP to STEP

Rename on Windows BUILT-IN

In File Explorer, enable File name extensions under the View tab, then right-click the .stp file, choose Rename, and change the extension to .step.

Command line - mv CLI

On macOS or Linux run mv model.stp model.step - no additional tools needed.

FreeCAD FREE

Open the .stp file, go to File > Export, select STEP as the output format, and save - use this when the file header metadata must be rewritten for a specific application protocol.

CAD Assistant FREE

Open the .stp file in CAD Assistant by Open Cascade and export as .step - lightweight, free, and requires no account.

About these formats

.STP STEP - Standard for the Exchange of Product Data (ISO 10303), .stp spelling

An STP file is a 3D CAD model - a part or assembly - stored in the ISO 10303 STEP format so it can move between different CAD programs. The fastest free options are FreeCAD, CAD Assistant,…

Open .STP details →
.STEP STEP - Standard for the Exchange of Product Data (ISO 10303)

A STEP file is a 3D CAD model stored in the ISO 10303 neutral format so engineers can share geometry between different CAD programs. To view one for free, use FreeCAD, CAD Assistant, or…

Open .STEP details →

Quality & what to watch

  • .stp and .step files are byte-for-byte identical - the extension is the only difference, so no geometry or metadata is lost in a rename.
  • If a receiving system demands a specific STEP protocol (AP203 or AP242), a rename may not be enough; open the file in a CAD tool and re-export with the required protocol declared.
  • STEP stores precise B-rep surfaces and solids, not a triangle mesh - geometry is exact, which is why it is the standard format for engineering data exchange.

Frequently asked questions

Are STP and STEP the same file format?
Yes. Both extensions refer to ISO 10303-21, an ASCII text format for CAD data interchange. .stp is the older three-letter spelling from the DOS era; .step is the full name.
Will renaming my STP file to STEP break anything?
No. CAD applications identify the format by the ISO-10303-21; header line inside the file, not by the extension alone. Renaming is completely safe.
Why does some software only accept .step and not .stp?
Those applications check the extension string before reading the file. It is a software limitation, not a format difference, and a simple rename resolves it.
When do I actually need to re-export rather than just rename?
Only if the receiving system validates the application protocol (AP203 vs AP242) declared in the file header. That is an edge case; a rename works in nearly every situation.