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cadformats.com/3dm/viewer

3DM·.3dm

3DM viewer

Open a .3dm file below and it appears on screen, with its dimensions and units. The file is read on your own computer and is never uploaded.

Drop a .3dm file

.3dm

Choose a 3DM file

Free, and it opens in this tab. Nothing is uploaded, and there's no account to make.

Runs locally · nothing uploaded

Dimensions

What to expect

3DM files already contain triangles, so they open quickly without downloading a CAD engine. The only limit on a very large mesh is your browser's memory.

3DM records its unit, so the size shown is the real size.

Convert it instead

→ 3MF
→ GLB
→ GLTF
→ OBJ
→ PLY
→ STEP
→ STL
→ USDZ

More about .3dm files →

cadformats.com

16 formats,120 conversions, all120 of them passing their tests. Everything except the15 routes that write STEP runs in your browser.

Browse

All formats
The pair matrix
STEP viewer
STL viewer

How this works

What happens to your file
Licences and bundled source
How claims are sourced and dated
How conversion loss is reported

This build

built: 2026-09-04
kernel: occt 0.0.23
viewer: three 0.185.1
rhino3dm: 8.32.2

Verify these →