iLoveSTL
free · no sign-up PT
Free STL converter · no sign-up

Any 3D file becomes a clean STL.

Mesh or CAD — OBJ, FBX, 3MF, PLY, DAE, GLB, STEP, IGES, DWG and DXF — converted in seconds, with a 3D preview before you download.

Convert a file → Parts to measure

From file to STL

Drop the model and watch the part take shape — no program to open.

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

Browse by format

What changes in conversion, which engine handles it and what usually goes wrong.

See all formats
.obj OBJ Assimp .fbx FBX Assimp .3mf 3MF In-house engine .ply PLY Assimp .dae DAE Assimp .glb GLB Assimp .step STEP Open CASCADE .iges IGES Open CASCADE .dwg DWG LibreDWG .dxf DXF LibreDWG

More tools

All free and in the browser. Anything marked “coming soon” does not exist yet.

Parts live

Parts to measure

Enter the dimensions and download the finished part in STL and STEP — box, bracket, adapter, spacer.

FreeOpen →
Mesh live

Split STL

Part bigger than the build plate? Split it into parts that fit, with a colour preview first.

FreeOpen →
Conversion live

Mould generator

Upload the object and download a two-part mould for candles, soap, plaster and resin — with the material volume worked out.

FreeOpen →
Mesh live

Repair mesh

Closes holes and fixes flipped normals that make the slicer reject the file — with a before-and-after report.

FreeOpen →
Mesh live

Resize STL

Scale by final dimension, percentage or unit change (inch to mm), without the file leaving your computer.

FreeOpen →
Mesh live

Split 3MF by colour

A 3MF painted in Bambu Studio or OrcaSlicer becomes one solid part per colour — print each in its colour and fit them together.

FreeOpen →
Personalised live

Lithophane

A photo becomes a relief to print and hold against the light: flat or curved, with a frame. The photo never leaves your computer.

FreeOpen →
Printing planned

Weight and time

Estimate filament and print hours before sending the part to the queue.

Coming soon

Built by people who print every day

Four details that separate an STL that opens from one the slicer refuses.

A geometric kernel for STEP and IGES

Files from SolidWorks, Fusion 360 or Inventor are read by Open CASCADE, the same kind of engine that runs inside a CAD program. A plain mesh importer trips on the automotive_design schema and returns an error.

Bambu and Orca 3MF, properly

Those slicers write geometry into separate files inside the package and mix in negative parts, which are cuts. We read the inner files and discard the cuts — which is why the STL comes out full instead of empty.

We never hand back an empty STL

Every generated file is checked before it leaves: if there is no triangle inside, you get a clear warning instead of a download that opens blank in the slicer.

No account, no trace

No email, no hidden daily limit, no watermark. The file is converted on the server 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.

The tools

R$ 0 forever, no sign-up

  • 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.

The printed part · NEO 3D Print

10% off your first print · coupon NEO10

  • Instant price, calculated on their site from your file — no sign-up, no waiting for a quote.
  • Reprint guarantee if the part comes out off spec.
  • Pix and bank slip with 5% off, or card in instalments.
  • Has printed for LIPPEL, Tecnogera, GMG and ProStreet Studio, among others.
See my part's price See the service

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.

Frequently asked questions

Is it really free? Where is the catch?
No sign-up, no card, no hidden daily limit and no watermark on the file. The tools pay for themselves because we recommend one partner print shop to anyone who wants the part printed, and we are paid for that referral — it is stated in the partner block and in the footer.
What happens to my file?
It is uploaded, converted on the server and discarded right after. We do not keep the model, do not publish it in any public gallery and do not use it to train anything. Details are in the privacy policy.
My Bambu Studio 3MF opens empty in other converters. Does it work here?
It works. Bambu Studio and OrcaSlicer use the 3MF “production” extension, where geometry sits in separate files inside the package — most converters read only the index and hand back an empty STL. Ours reads the inner files and also drops the negative parts, which are slicer cuts.
Does it convert STEP and IGES from mechanical CAD?
It does. Those formats go through a full geometric kernel (Open CASCADE), the same kind of engine CAD programs run on, not through a mesh reader.
Does it convert AutoCAD DWG?
It converts what is already 3D in the DWG: meshes, 3D faces and flat-faced solids. A 2D drawing (floor plan, sheet part) has no volume to become an STL, and curved-surface solids cannot be read by any free tool yet — in both cases the screen explains why. From AutoCAD, the STLOUT command exports the STL directly.
What is the maximum file size?
250 MB. Very dense parts may be optimised during conversion — when that happens we show on screen how many polygons went in and how many came out.
Do you print?
No. iLoveSTL is tooling only. When a part has to become a physical object we recommend NEO 3D Print — and we say openly that the referral is paid.