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Local viewer

STP Viewer

Open and inspect .stp files directly in your browser with a private local STP 3D viewer.

Processed locally
No signup required
Files stay on your device
Isometric STP file illustration for Modelfy's local STP viewer

Private local preview

Upload a local file to inspect it here.

Browser-local workflow

How this tool works

  1. Step 1

    STP file

    Choose a STP file from this device.

  2. Step 2

    Local parser

    The browser reads the supported file data locally.

  3. Step 3

    Interactive preview

    Orbit, inspect, and review the loaded model in this tab.

Direct answer

Can I open STP files in my browser?

Yes. This STP viewer parses and renders a single file locally in your browser, so the model is not uploaded to Modelfy. STP files up to 50 MB are accepted. Current boundary: STP AP203/AP214 solids are tessellated for display; editable B-rep and feature history are not exposed.

Current browser support

Limits to know before opening the file

  • STP AP203/AP214 solids are tessellated for display; editable B-rep and feature history are not exposed.

Practical workflows

When this format is a useful fit

  1. 01Mechanical CAD exchange
  2. 02Supplier and manufacturing handoff
  3. 03Engineering design review

Why choose this online STP viewer

Local STP file parsing

The selected STP model file is decoded on your device and is not uploaded to Modelfy. The page itself still loads normal website code and static assets.

Inspect STEP (ISO 10303) — .stp extension geometry

Orbit, zoom, and pan around the loaded model to review geometry for mechanical cad exchange before using it in another application.

STP support boundary

Current browser implementation: STP AP203/AP214 solids are tessellated for display; editable B-rep and feature history are not exposed.

Continue a STP workflow

Use the related tools to compare other viewers or move supported STP geometry into a documented target format.

How to open an STP file online

  1. 01

    Upload your file

    Drag and drop an STP file into the viewer, or click Upload to pick one from your device.

  2. 02

    Inspect in 3D

    After the STP loader finishes, drag to rotate, scroll to zoom, and right-click to pan while checking the model for mechanical cad exchange.

  3. 03

    Continue your workflow

    Review the documented boundary before continuing: STP AP203/AP214 solids are tessellated for display; editable B-rep and feature history are not exposed.

About the STP file format

STEP (ISO 10303) — .stp extension

.stp and .step are two extensions for the same ISO 10303 CAD exchange format. The shorter .stp survives from the 8.3 filename era and remains common in manufacturing.

Everything about STEP applies to STP: exact BREP solids, assembly structure, and universal CAD support. This viewer tessellates the solids locally in your browser for display.

Format reference: ISO 10303-21 standard record

Strengths

  • Identical to STEP under another extension
  • Exact CAD geometry
  • Universal engineering support

Commonly used for

  • Mechanical CAD exchange
  • Supplier and manufacturing handoff
  • Engineering design review

Frequently asked questions

Is my STP model file uploaded to a server?

The selected STP model file is processed by the browser and is not uploaded to Modelfy. Website code and static assets still load over the network like a normal web page.

Is the STP viewer free to use?

Yes. The browser viewer, converter, and local 3D text tool require no account and add no watermark. Input limits vary by format, up to 50 MB; AI model generation is a separate credit-based product.

What is the maximum file size?

STP inputs up to 50 MB are accepted. The format-specific limit keeps browser-local parsing bounded; actual processing also depends on available memory, model complexity, and device performance.

Are STP and STEP files different?

No — they are the same ISO 10303 format. Some CAD tools default to the .stp extension while others use .step; both open identically here.

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AI 3D generation

From a single image to a production-ready 3D model

These browser tools stay free for viewing and converting files you already have. When the model does not exist yet, Modelfy generates a textured mesh from one reference image — the first one is free.

Try the AI 3D generator