Add your IGS file
Drop one or more .igs files onto the converter above, or browse for them. They load into browser memory only — nothing is uploaded, so there is no size-based pricing and no server queue.
IGS to STL
Converting .igs CAD geometry to .stl triangulates exact engineering surfaces into a mesh that printers and viewers understand. Free, private, and validated — the file never leaves your browser.
Private for supported formats — processed in your browser
Runs on your deviceConvert supported files
Drop IGS files here
Batch files can each use a different output. Nothing uploads for local conversions.
Working inputs include camera RAW, browser-local audio/video, PDF, CBZ/CBR comics, office documents, ebooks, markup, 3D models, structured text, images, and archives.About converting IGES model to STL mesh
Converting .igs CAD geometry to .stl triangulates exact engineering surfaces into a mesh that printers and viewers understand. An .igs file contains IGES CAD data under the abbreviated extension that early file systems, limited to three characters, forced on the format. Nothing but the name differs from .iges: the same punch-card-style text encodes the same curves, surfaces, and drawing entities.
STL is the original 3D-printing file format: a .stl file reduces a solid model to a shell of triangles, each defined by three vertices and a facet normal. Its brutal simplicity — no units, no color, no structure — made it the universal least common denominator for sending shapes to a printer. For this route the practical draw is understood by every slicer, printer, CAD package, and mesh tool without exception and simple to generate and parse — balanced against missing units cause real-world scale errors between metric and imperial toolchains, which is worth knowing before you commit a large batch.
Why convert IGS to STL?
The practical trigger for this conversion is usually a mismatch: with .igs, two spellings for one format regularly confuse file filters and format lists. Switching to .stl buys you understood by every slicer, printer, CAD package, and mesh tool without exception, which is why it is the better fit for sending models to slicers for FDM, SLA, and SLS printing. Because the conversion runs locally, trying it costs nothing but a few seconds of compute on your own machine.
IGS vs STL at a glance
| Aspect | IGES model (.igs) | STL mesh (.stl) |
|---|---|---|
| Format type | Vector — resolution-independent geometry instead of pixels | Vector — resolution-independent geometry instead of pixels |
| How it stores data | the same five-section, 80-column record structure as .iges, with a letter code in column 73 marking each section | binary STL stores an 80-byte header, a 32-bit triangle count, and fifty bytes per facet; the older ASCII form spells out solid, facet, and vertex keywords |
| Strongest at | reading decades-old supplier geometry that shipped with the short extension | sending models to slicers for FDM, SLA, and SLS printing |
| Weak spot | two spellings for one format regularly confuse file filters and format lists | missing units cause real-world scale errors between metric and imperial toolchains |
| Metadata | the same Global-section fields as the longer spelling: sender, author, units, and timestamps, and little else | essentially none — the binary header offers 80 free-form bytes and the ASCII solid name a single token, neither standardized for metadata |
Pick STL as the output
Select .stl in the output menu next to each file. The menu only offers targets this engine can genuinely produce, so if STL is selectable, the route is real and validated.
Convert on your device
Press Convert. Open CASCADE compiled to WebAssembly triangulates the exact CAD geometry into a mesh inside your browser.
Verify and download
Each result is signature-checked before the download unlocks, so a failed encode can never masquerade as a valid STL file. Outputs keep the original filename with the .stl extension.
IGS to STL questions, answered
Will converting IGS to STL lose quality?
Since igs is vector-oriented and stl is vector-oriented, the conversion preserves the source content exactly as stored; no additional compression pass is applied beyond what .stl itself requires.
Is it private to convert IGS files here?
Yes — the .igs file is processed inside your browser tab and never uploaded. Open CASCADE compiled to WebAssembly triangulates the exact CAD geometry into a mesh inside your browser. Close the tab and the file is gone from memory.
Where will the STL file work?
Support is as close to universal as 3D formats get: every slicer (PrusaSlicer, Cura, Bambu Studio), every CAD package, and mesh tools from Blender to MeshLab read and write .stl, and Windows and macOS both preview it natively. Its weaknesses are functional rather than compatibility-related — which is exactly why 3MF was designed to replace it.
Will the STL file be bigger or smaller than my IGS?
It depends on the content: binary STL stores an 80-byte header, a 32-bit triangle count, and fifty bytes per facet; the older ASCII form spells out solid, facet, and vertex keywords. Convert one representative file first and compare before batch-processing a large set.
What happens to the metadata in my IGS file?
In .igs, the same Global-section fields as the longer spelling: sender, author, units, and timestamps, and little else. Re-encoding through the browser pipeline does not carry embedded metadata into the output, which doubles as a privacy scrub — check the exported file if you specifically need tags preserved.