All 3D AI tools are now free to use -- no credit card required.Try it free →

Free Online STL to OBJ 3D File Converter

Convert 3D files between different formats online. Free and easy to use, supporting conversion between mainstream formats like GLB, GLTF, OBJ, STL and more. No software installation required -- complete conversions directly in your browser.

STL.stl

OBJ.obj

Drag & Drop or Click to Uploador drag and drop fileMaximum file size: 50MB | Supported formats: GLB, GLTF, OBJ, STL, FBX, PLY, USDZ

Multi-Format 3D Model Preview

Support online preview of mainstream 3D file formats including GLB, GLTF, OBJ, STL, FBX and more. View 3D model details without downloading any software.

No Software Installation Required

No need to install any 3D software or plugins. Convert 3D files directly in your browser with support for batch processing and instant downloads.

Free for All 3D Files

Support conversion of 3D models of various complexity, from simple geometry to complex scenes. Completely free to use with no file count restrictions.

Privacy Protection

Your 3D files are only processed locally in the browser, not uploaded to servers. Your model data is completely safe and private throughout the conversion process.

View on Any Device

Support desktop, tablet and mobile devices. Responsive design ensures optimal conversion experience across different screen sizes. Convert your 3D models anywhere, anytime.

How to Convert STL to OBJ

Converting your 3D model files is quick and simple. Follow these three easy steps to transform your STL files to OBJ format.

Upload STL File

Simply drag and drop your STL file into the designated area or click to select files. Supports popular formats including GLB, GLTF, OBJ, STL with maximum file size of 50MB.

Convert to OBJ

Select OBJ from the target format dropdown menu. Our tool automatically preserves geometry details, materials, and textures during conversion without requiring any technical knowledge.

Download Your Model

Once conversion completes in seconds, click the download button to save your OBJ 3D model. Ready for 3D software editing or uploading to other platforms for texturing.

Understanding STL and OBJ Formats

Learn about these popular 3D file formats and why you might need to convert between them.

STL

What is STL Format?

STL (Stereolithography) is the standard format for 3D printing. Created by 3D Systems in the 1980s, it stores raw triangulated surface geometry without color or texture information. Its simplicity makes it universally compatible with all slicing software and 3D printers, from desktop FDM to industrial SLA machines.

OBJ

What is OBJ Format?

OBJ (Wavefront Object) is one of the oldest and most universally supported 3D file formats. Developed by Wavefront Technologies in the 1980s, OBJ stores geometry data in a simple, human-readable text format. It supports vertices, normals, texture coordinates, and can reference external MTL files for material definitions. Nearly every 3D software application supports OBJ.

Why Convert STL to OBJ?

Convert STL to OBJ when you need material support via MTL files. OBJ adds texture coordinate and material capabilities that STL lacks, while maintaining broad compatibility.

File Size Comparison

File size differences between STL and OBJ depend on model complexity and the data each format stores. Our converter optimizes the output for the target format while preserving all supported features.

STL to OBJ Converter - FAQ

Frequently asked questions about converting STL to OBJ format and our 3D file conversion service.

We support conversion between GLB, GLTF, OBJ, STL, FBX, USDZ, BLEND, DAE, 3MF, and PLY formats. All conversions are bidirectional, so you can convert any supported format to any other supported format. Our advanced conversion engine maintains geometric precision, material properties, and texture quality across all format transformations.

All 3D File Converters

Choose any format combination and start converting instantly

GLB→GLTF

Ready to Generate 3D Models with AI?

Try our AI-powered 3D model generator and create stunning 3D assets in seconds. Free to use, no credit card required.

Get Started Free

Free Online STL to OBJ 3D File Converter

Multi-Format 3D Model Preview

No Software Installation Required

Free for All 3D Files

Privacy Protection

View on Any Device

How to Convert STL to OBJ

Upload STL File

Convert to OBJ

Download Your Model

Understanding STL and OBJ Formats

What is STL Format?

What is OBJ Format?

Why Convert STL to OBJ?

File Size Comparison

STL to OBJ Converter - FAQ

All 3D File Converters

GLB to GLTF

GLB to OBJ

GLB to FBX

GLB to STL

GLB to USDZ

GLB to BLEND

GLB to DAE

GLB to 3MF

GLB to PLY

GLTF to GLB

GLTF to OBJ

GLTF to FBX

GLTF to STL

GLTF to USDZ

GLTF to BLEND

GLTF to DAE

GLTF to 3MF

GLTF to PLY

OBJ to GLB

OBJ to GLTF

OBJ to FBX

OBJ to STL

OBJ to USDZ

OBJ to BLEND

OBJ to DAE

OBJ to 3MF

OBJ to PLY

FBX to GLB

FBX to GLTF

FBX to OBJ

FBX to STL

FBX to USDZ

FBX to BLEND

FBX to DAE

FBX to 3MF

FBX to PLY

STL to GLB

STL to GLTF

STL to OBJ

STL to FBX

STL to USDZ

STL to BLEND

STL to DAE

STL to 3MF

STL to PLY

USDZ to GLB

USDZ to GLTF

USDZ to OBJ

USDZ to FBX

USDZ to STL

USDZ to BLEND

USDZ to DAE

USDZ to 3MF

USDZ to PLY

BLEND to GLB

BLEND to GLTF

BLEND to OBJ

BLEND to FBX

BLEND to STL

BLEND to USDZ

BLEND to DAE

BLEND to 3MF

BLEND to PLY