STL

Writable

file format used by CAD software and 3D printers

Identify it

Extensions	`.stl`
MIME types	`model/stl`
Signatures	`736f6c6964` at byte 0
PRONOM	`x-fmt/108fmt/865`
Wikidata	`Q1238229`
Library of Congress	`fdd000504`

Not sure your file is this? Identify it from its first bytes, in your browser.

Open it

BlenderOpen sourcereads and writes · GNU General Public License, version 3.0
BRL-CADOpen sourcereads and writes · GNU Lesser General Public License, version 2.1
DicomToMeshOpen sourcewrites · MIT License
Q251322Open sourcereads and writes · GNU Library General Public License, version 2.0 or later
Q3353120Open sourcereads and writes · GNU General Public License, version 2.0 or later
SALOMEOpen sourcereads and writes · GNU Lesser General Public License, version 2.1 or later
Visualization LibraryOpen sourcereads and writes · BSD licenses
Wings 3DOpen sourcereads and writes · BSD licenses
CloudCompareOpen sourcereads · GNU General Public License
GIMIASOpen sourcereads · BSD licenses
MayaViOpen sourcereads · BSD licenses
MeshLabOpen sourcereads · GNU General Public License
PhotoRecOpen sourcereads · GNU General Public License
Alibre Designwrites
Amapi Pro 7reads and writes
Autodesk 3DS Max 8reads and writes
Autodesk 3DS Max 9reads and writes
Cinema 4Dwrites · proprietary license
Cobaltwrites
IntelliCADreads and writes
IRONCADreads and writes
Mathematicareads and writes · proprietary license
Moment of Inspirationwrites
Nugrafreads and writes
PhotoModelerwrites · proprietary license
PolyTrans 4.1.2reads and writes
Qlonereads and writes
Qlone Dentalreads and writes
Rhinoceros 3Dreads and writes · proprietary license
SketchUpreads and writes
SolveSpacewrites
T-FLEX CADwrites · proprietary license
Tinkercadreads and writes
TransMagicreads and writes
VariCADwrites · proprietary license
VisualARQreads and writes
xCADwrites
3D Utilitiesreads
ABViewerreads
Anim8orreads · freeware

And 27 more in the JSON record.

Convert it

No conversion recorded. One of the tools above may export it; search for a chain.

Documentation

kaitai grammar: https://github.com/kaitai-io/kaitai_struct_formats/blob/master/media/stl.ksy

Versions and variants (2)

STL (Standard Tessellation Language) ASCIIUnknown
STL (Standard Tessellation Language) BinaryPartly documented

Sources

From Just Solve the File Format Problem (File Formats Wiki), Kaitai Struct format gallery, Wikidata. Updated 2026-10-24.

Improve this record JSON