← 博客

STEP文件在线查看器 — 无需Fusion 360打开.step和.stp文件

STEP file viewer online — MakerSuite 3D

为什么打开STEP文件不需要Fusion 360

STEP(ISO 10303-21)是通用的CAD交换格式——从Fusion 360到SolidWorks再到NX,几乎所有机械设计工具都支持。但打开它通常意味着安装庞大的CAD软件、注册云查看器,或将设计上传到陌生人的服务器。MakerSuite 3D采用不同的方法:STEP解析器在您的浏览器标签页中运行,由编译为WebAssembly的OpenCascade驱动。拖放.step或.stp文件,几秒内即可看到装配体——无需安装、无需账号、无需上传。

查看器支持的范围

MakerSuite 3D支持三种主流STEP应用协议——AP203(配置管理3D设计)、AP214(汽车)、AP242(AP203+AP214合并加PMI)。嵌套零件、变换和每面颜色的装配体都会保留。结果是完全可导航的Three.js场景,支持轨道、缩放、剖切和测量。

主要功能

如何查看STEP文件

  1. Open pcbviewer.app/tools/3d-viewer无需安装、无需账号
  2. 将.step或.stp文件拖放到放置区(或点击浏览)
  3. 等待解析提示 — 50 MB装配体通常需要5-15秒
  4. Inventor风格控制 — 中键旋转、右键平移、滚轮缩放
  5. 使用测量工具(M)测距,剖切工具剖开,场景树切换零件

Drop a .step or .stp file — see your CAD model in seconds.

Try MakerSuite 3D Free

为什么需要浏览器STEP查看器

STEP文件是硬件设计的通用语——供应商发送、客户请求、开源硬件项目发布。但每个相关方不应该为了打开一个文件就需要2000美元的CAD许可证。浏览器查看器让采购团队检查供应商机械结构、电气工程师验证外壳适配、采购方验证样品——全部无需安装软件。而且因为解析在本地进行,公司可以分享STEP文件而不用担心云上传的NDA违规风险。

使用场景

隐私保护

STEP文件完全在您的浏览器标签页中解析。无上传、无服务器往返、无账号。关闭标签页即无痕迹。同样适用于查看器支持的所有格式——STL、OBJ、GLB、FBX、3MF等。

Frequently Asked Questions

Do I need Fusion 360 or SolidWorks to open a STEP file?

No. MakerSuite 3D parses STEP files entirely in your browser using occt-import-js (OpenCascade compiled to WebAssembly). You get a full 3D preview — assemblies, colors, and geometry — without installing any CAD software or creating an account.

What STEP versions are supported?

AP203, AP214, and AP242 — the three dominant STEP protocols for mechanical CAD. Both .step and .stp extensions work. The parser handles assemblies with nested parts and transforms them into a Three.js scene graph you can orbit, zoom, and measure.

Can I measure dimensions on a STEP model?

Yes. Click the Measure tool, then click two points on the model to get a distance readout in mm or inches. The measurement list persists in the sidebar so you can capture multiple dimensions without losing previous ones.

Does it work for large assemblies?

STEP files up to ~200 MB parse in most modern browsers. For anything larger, the first-load time can exceed 30 seconds — we show a progress toast so you know it's still working. If your assembly is 500 MB+, consider splitting it before upload.

Is my STEP file uploaded anywhere?

No. Parsing happens entirely in your browser tab. The STEP file never leaves your machine, there's no server round-trip, and no account is needed. Close the tab and there's no trace.

Related Articles

Free STL Viewer OnlineFBX Viewer in Your BrowserPCB STEP Model Viewer

立即打开STEP文件 — 零安装、零注册

启动3D查看器