STEP Viewer

STEP Viewer opens STEP (.step, .stp) CAD files in 3D on your phone. No desktop CAD software needed.

Everything is free. There are no in-app purchases. Credits only skip the ad; without credits you can still open every file after watching a short ad.

Key features

• Open .step and .stp files straight from your file manager - just tap the file
• Measure your model: a bounding box with all three side lengths, in mm or m
• Six fixed views (front, right, back, left, top, bottom), plus pinch to zoom, pan and rotate
• Save the converted model as GLB whenever you need it
• Large files show the estimated time and memory before conversion starts, and progress while it runs
• If a file cannot be opened, the app tells you why instead of failing silently
• Available in 12 languages, following your device settings

Supported formats

• Input: .stp, .step (STEP AP203, AP214)
• Output: .glb (glTF Binary)

How to use

1. Tap a .step file in your file manager, or open the app and tap the folder icon
2. Wait for the conversion - large files show progress and an estimate
3. Drag to rotate, pinch to zoom, tap the view button to switch sides

License This app uses Open CASCADE Technology (LGPL-2.1). https://www.opencascade.com

For questions or bug reports, please contact us by email.