*Markdown alternate of . Lasertally is Windows desktop software that quotes laser-cut parts for fabrication shops from CAD files, then nests the won job on sheet or tube. Unrelated to "laser tally" in oil and gas.* IGES STL Free online converter · no sign-up # IGES to STL converter. To turn an IGES file into an STL for 3D printing, drop the .igs or .iges file below, pick Standard or Fine, and download the .stl, free and with no account. The converter sews the surfaces together first and then meshes them. It runs in your browser, so the file never leaves your computer unless you choose to send it to us, and the mesh is checked against the sewn part before you can download it. Your file never leaves your computer unless you choose to send it to us: the conversion runs in your browser. ## How to convert IGES to STL - Drop the file. Drop your .igs or .iges file on the box above, or choose it from your computer. - Read the line under its name. 1 solid means the surfaces closed. 0 solids means they did not, and the STL will have the same gaps. - Pick a resolution. Convert to starts on Standard (0.05 mm). Fine (0.01 mm) is in the same menu. - Press Convert, then Download. The STL comes out in binary, in millimetres. Table: IGES to STL at a glance | IGES to STL | What happens | | --- | --- | | Reads | IGES files (.igs, .iges). Surfaces are sewn at 0.01, then 0.05, then 0.1 mm. | | Writes | Binary STL, in millimetres, at Standard (0.05 mm, 5 degrees) or Fine (0.01 mm, 1 degree) resolution. | | Keeps | The shape, within the tolerance you pick. Every body goes into the one STL, in place. | | Drops | True curves, which become flat triangles, plus colours and layers. | | Checks | The mesh's volume and bounding box, against the sewn part. Not that the mesh is closed. | | Costs | Free, with no account and no limit on how many files you convert. | ## Sewn first, then meshed An IGES file is usually a pile of surfaces, and meshing each one by itself would leave cracks wherever two of them do not quite meet. So the converter sews them first, at 0.01 mm, then 0.05 mm, then 0.1 mm if it has to, keeping the first that closes. Once neighbouring faces share an edge, the mesh runs along the same points on both sides of it, so a part that closes normally gives a closed mesh. ## If the surfaces do not close The line under the file name tells you before you convert: it says 0 solids and counts the open surfaces. You still get an STL, but it is a mesh of those surfaces with the gaps left in, because nothing is patched shut. A slicer will complain about that, or guess. Ask whoever sent the IGES for a STEP or for the original file, or close the part in CAD first. ## Standard or Fine Both are the same two settings as every other route to STL. They give different numbers here, because an IGES tends to describe the same shape with different surfaces: the bracket from its STEP makes 14,288 triangles at Standard and 280,832 at Fine. Table: One bracket from a SOLIDWORKS IGES | Resolution | Tolerance | Triangles | STL size | Time | | --- | --- | --- | --- | --- | | Standard | 0.05 mm, 5 degrees | 12,140 | 593 KB | 2.4 s | | Fine | 0.01 mm, 1 degree | 320,316 | 15.3 MB | 19 s | That is a 120 x 80 x 30 mm bracket modelled in SOLIDWORKS 2024 (a plate with a filleted, chamfered boss and five holes), from a 177 KB IGES, on a desktop PC on 5 November 2026. The check line at Standard read: "Verified: the STL was read back. Its mesh agrees with the solid on volume to 0.01% and size to 0.001 mm, at Standard resolution (0.05 mm, 5°)." ## How the mesh is checked The STL is read back and measured against the sewn part. Its volume may differ only by the surface area times the tolerance, and its bounding box must match to within that tolerance. Nothing else is measured, so this does not prove the mesh is closed, and a small missing face can pass. Credits and licences for the projects the converter is built on are on the converter page. ## Questions Q: Why does the page say my IGES has open surfaces? A: Sewing at up to 0.1 mm did not close them into one solid. That usually means a gap wider than that or a missing face, but a file of several bodies can stop here with smaller gaps. The converter does not guess at what should be there. Ask for the part as STEP, or close it in CAD. Q: Will the STL print? A: If the IGES closed into a solid, it normally gives a closed mesh that slices normally, though the check does not prove the mesh is closed. If the file held open surfaces, the mesh has the same gaps, and a slicer may refuse it or fill them wrongly. Q: Is IGS to STL the same thing? A: Yes. IGS and IGES are two extensions for one format, and both go in the same way. Q: Can I get the IGES back from the STL? A: Not the same IGES. STL to IGES gives a faceted solid of flat faces, because the curved surfaces are gone once a part is a mesh. Keep the original. ## Every conversion Table: Every conversion the converter does | From | To STEP | To IGES | To STL | | --- | --- | --- | --- | | SLDPRT | SLDPRT to STEP | SLDPRT to IGES | SLDPRT to STL | | X_T | X_T to STEP | X_T to IGES | X_T to STL | | X_B | X_B to STEP | X_B to IGES | X_B to STL | | STEP (.stp) | Already STEP | STEP to IGES | STEP to STL | | IGES (.igs) | IGES to STEP | Already IGES | IGES to STL | | STL | STL to STEP | STL to IGES | Already STL | ## Quoting laser-cut parts from files like these? Lasertally is Windows software for fabrication shops. It opens STEP, IGES, DXF and NC1 files, measures the pierces, cut length and bends off the geometry, and prices the part on your own rate card. Start your free month Quoting from STEP ## Keep reading All conversions Every format pair, what is checked, and the limits. IGES to STEP The same surfaces, sewn into an exact solid. STL to IGES The other direction, and why it stays faceted.