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Your file never leaves your browser.

cadformats.com/stl/viewer

STL·.stl

STL viewer

Open a .stl 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 .stl file

.stl

Choose a STL 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

STL 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.

STL stores no unit, so the size is shown in mm by convention. Check it against what you expect.

Convert it instead

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

More about .stl 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 →