The tools
- 10 formats become STL, with a 3D preview before you download.
- Parts to measure as STL and STEP, from your own dimensions.
- No sign-up, no watermark — the file is discarded afterwards.
Wavefront OBJ
Convert OBJ
Convert OBJ
to STL
Drop the .obj file below. Conversion runs in seconds, with a 3D preview before you download — free and with no sign-up.
Convert to STL
engine online
Drop the file here
or click to choose · up to 250 MB
converted on the server and discarded right after
Converting…
loading 3D preview…
drag to rotate · ctrl + scroll to zoom
file.stl
done — the download has started
—triangles
—size mm
—volume
Make it lighter
—
Merges the triangles that do not change the shape. Check the preview before using it.
Recommended partner
If this part has to become a physical object, NEO 3D Print prints and ships anywhere in Brazil — the price shows up instantly, from the file itself.
See this part's price- No file is kept
- Engine: Assimp
- Up to 250 MB per file
About the format
OBJ, in one sentence.
The most common format among modelling tools. Quads are triangulated during conversion, so the mesh comes out closed.
Input.obj — Wavefront OBJ
EngineAssimp
OutputBinary STL, validated: if there is no triangle inside, the conversion fails with a clear message instead of handing over an empty file.
Limit250 MB per file, no watermark and no daily limit.
Questions
Frequently asked questions
What changes when converting OBJ to STL?
The most common format among modelling tools. Quads are triangulated during conversion, so the mesh comes out closed.
Do I need to install anything?
No. Conversion happens on the server and the file comes back ready in the browser. There is no sign-up, plugin or program to install.
Is the file kept?
No. It is converted and discarded right after — we do not keep it, publish it or use it to train anything.
From file to part in hand.
Converting is the easy part. The hard part is finding someone who prints it right, charges a clear price and delivers on time. So we recommend exactly one — the one we use.
Disclosure: we have a commercial partnership with NEO 3D Print and are paid for referrals. That is what pays the server and keeps the tools free, with no sign-up and no third-party ads. We recommend them because they are who we use — and the text above describes their service, not an independent review.
Other formats