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Convert 3D File Tool

Convert common CAD and mesh files to STL, then open the result in iamRapid's STL analysis, wall thickness, and error detection tools.

3D file conversion

Convert 3D files online — free, in your browser

Upload an STL or OBJ mesh and convert it to a clean STL, OBJ or PLY file in seconds. iamRapid reads your model, welds coincident vertices into a tidy indexed mesh, then writes your chosen format — binary STL for slicers and 3D printing, OBJ for modelling tools, or ASCII PLY for 3D-scanning and photogrammetry workflows. Everything runs locally in your browser — no upload, no account, and your model never leaves your device.

Input formats: STL (binary & ASCII) and OBJ. Output formats: STL (binary), OBJ and PLY (ASCII). For STEP, IGES or 3MF, export an STL or OBJ from your CAD tool first, then convert here.

Common conversions this tool handles
STL to OBJ OBJ to STL STL to PLY OBJ to PLY ASCII STL to binary STL PLY for 3D scanning

How to convert 3D files online

This free online 3D file converter changes a mesh between the three formats it supports — STL, OBJ and PLY — without installing any software. Whether you need to convert STL to OBJ, OBJ to STL, or export a mesh to PLY for 3D-scanning tools, the tool reads your file, welds duplicate vertices into a clean indexed mesh, and writes the format you select. There is no sign-up, no watermark, and your model is processed entirely in your browser so it never leaves your device.

STL, OBJ and PLY — what each format is

How the 3D file converter works

  1. Upload your file — drop an STL (binary or ASCII) or OBJ file into the dropzone above. It is read locally in your browser.
  2. The mesh is cleaned — the engine parses the geometry and welds coincident vertices into a tidy indexed mesh, so the output is compact and consistent.
  3. Pick your target format — choose STL (binary), OBJ or PLY (ASCII) from the dropdown.
  4. Preview and download — check the 3D preview and triangle count, then download the converted file with one click.

Everything runs entirely in your browser. No software to install, no upload to a server, and no account required.

When do you need to convert a 3D file?

Conversion is useful when your modelling tool exports OBJ but your slicer needs STL, when you want an editable OBJ from a print-ready STL, or when you need a PLY for a 3D-scanning or point-cloud workflow. Converting to a clean, indexed mesh also keeps file sizes small and avoids duplicate-vertex issues during later editing.

Find your queries

Frequently Asked Question(FAQ)

How do I convert an STL file to OBJ?
How do I convert an OBJ file to STL? plus-icon-for-expanding-answer
What is a PLY file and when should I use it? plus-icon-for-expanding-answer
Which 3D file formats does this converter support? plus-icon-for-expanding-answer
Is the 3D file converter free? plus-icon-for-expanding-answer
Is my file uploaded to a server? plus-icon-for-expanding-answer
Will converting change my model's dimensions? plus-icon-for-expanding-answer
Is the converted file ready for 3D printing? plus-icon-for-expanding-answer

Ready to print?

Once your file is converted, use our STL analysis tool to verify dimensions and volume, repair the mesh if it has errors, or get an instant quote from iamRapid for professional FDM, SLA, SLS, MJF and DMLS 3D printing across India.

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