Convert to STL

Convert any file to Stereolithography format — free, fast, and private

3D Models

Choose Files

or drag and drop files here

Max file size: 2GB

Your files are processed locally in your browser. Nothing is uploaded to any server.

About STL Format

Stereolithography (.stl)

Stereolithography (.stl) is a 3d file format.

Convert to STL from any format

Choose a source format below to convert to Stereolithography

OBJSTL FBXSTL GLTFSTL GLBSTL 3DSSTL PLYSTL DAESTL BLENDSTL 3MFSTL USDZSTL

Frequently Asked Questions

How do I convert files to STL?

Simply upload your file using the converter above, select STL as the output format, and click convert. The conversion happens instantly in your browser — no uploads needed.

What file formats can be converted to STL?

You can convert 10+ formats to STL, including OBJ, FBX, GLTF, GLB, 3DS and more. Browse the full list of supported source formats above.

Is converting to STL free?

Yes, Convert999 is 100% free with no limits. Convert as many files to STL as you need — no registration, no watermarks, no hidden fees.

Is my data safe when converting to STL?

Absolutely. All conversions happen locally in your browser. Your files are never uploaded to any server, ensuring complete privacy and security.

Explore STL

STL Converter

Convert from STL

STL Format

About Stereolithography

File Tools

Compress, resize, merge

Format Glossary

Learn about formats

Other Popular Conversions

.pdfConvert to PDF .docConvert to DOC .docxConvert to DOCX .odtConvert to ODT .rtfConvert to RTF .txtConvert to TXT .htmlConvert to HTML .htmConvert to HTM .mdConvert to MD .texConvert to TEX