Convert common 3D file formats in your browser.

Free, private, no upload — your files never leave your machine.

How it works

Three steps. Completely private. Your files never leave your browser.

Pick a tool

Choose the conversion you need from the tool grid below — STL to OBJ, OBJ to GLB, and more.

Drop your file

Drag and drop your file onto the converter. All processing runs entirely in your browser — your files never leave your machine.

Download the result

Your converted file downloads instantly. No upload, no account, no waiting. Nothing is sent to any server.

100% browser-side. We use the Three.js library to convert your files locally. No file is ever uploaded to a server. No account needed. Free forever.

12 free tools — all run in your browser

STL to OBJ Converter — Free, Browser-Side, No Upload

STL → OBJ

Convert STL files to OBJ format instantly in your browser. No upload, no account. Supports binary and ASCII STL. Free and private.

⚠ No units — STL stores raw coordinates with no unit metadata; confirm scale after conversion

Open tool

OBJ to STL Converter — Free, Browser-Side, No Upload

OBJ → STL

Convert OBJ files to STL format in your browser. Ideal for 3D printing. No file upload required. Supports single and multi-object OBJ files.

⚠ OBJExporter does not export MTL material files; geometry only, materials/textures are lost

Open tool

OBJ to GLB Converter — Free, Browser-Side, No Upload

OBJ → GLB

Convert OBJ files to GLB (binary glTF) format in your browser. No upload needed. Great for web 3D, AR, and game engines.

⚠ OBJ materials (MTL) are not preserved — if no MTL file is present, the UI will show a notice that materials are not retained

Open tool

GLB to OBJ Converter — Free, Browser-Side, No Upload

GLB → OBJ

Convert GLB files to OBJ format online, free and private. All processing happens in your browser. No server upload. Ideal for importing into modeling software.

⚠ Animations are lost — GLB animations are not supported in OBJ format

Open tool

PLY to STL Converter — Free, Browser-Side, No Upload

PLY → STL

Convert PLY mesh files to STL format in your browser for 3D printing. No upload required. Point cloud PLY files are not supported.

⚠ Texture references are not preserved — PLY to STL conversion loses any texture coordinate data

Open tool

GLTF / GLB Converter Online — Pack or Unpack, No Upload

GLTF / GLB → GLB / GLTF

Convert GLTF to GLB or unpack GLB to embedded GLTF JSON in your browser. Free, private, no upload, built for web 3D assets.

⚠ Single-file GLTF only — external .bin and texture files are not supported in the browser-only beta

Open tool

SVG to STL Converter — Free, Browser-Side, No Upload

SVG → STL

Extrude SVG paths into printable STL files in your browser. Adjust depth and scale. Free, private, no upload. Useful for logos and 2D designs.

⚠ 2D extrude / emboss only — this tool extrudes flat SVG paths into a 3D shape; it does NOT convert arbitrary SVG art into a full 3D model

Open tool

Image to STL Converter — Free Heightmap Relief, No Upload

Image → STL

Turn any image into a 3D-printable STL heightmap relief in your browser. Adjust depth and resolution. Free, private, no AI, no upload.

⚠ Heightmap / relief only — pixel brightness maps to surface height; this is NOT AI 3D reconstruction

Open tool

STL Repair Tool Online — Free, Browser-Side, No Upload

STL → repaired STL

Repair common STL mesh issues in your browser. Rebuild normals, remove degenerate triangles, and download a cleaned STL file.

⚠ Beta repair only — complex non-manifold meshes may still need a dedicated mesh editor

Open tool

STL Viewer Online — Free, Browser-Side, No Upload

STL → view

View and inspect STL files in your browser. Rotate, zoom, and pan 3D models. Supports files up to 200MB. Free, private, no upload required.

⚠ STL files have no unit metadata — displayed size reflects raw coordinate values

Open tool

3D Print Filament Calculator — Weight, Length, and Cost

Filament → length / cost

Calculate filament length, cost per meter, and estimated remaining material from spool weight, diameter, density, and price.

⚠ Estimates assume round filament with consistent diameter

Open tool

3D Printing Price Tool & Cost Calculator

Print job → estimated cost

Estimate 3D printing price from filament cost, print time, printer wattage, and electricity rate before adding labor or markup.

⚠ This calculator estimates direct material and electricity cost only

Open tool

How it works

Three steps. Completely private. Your files never leave your browser.

Pick a tool

Choose the conversion you need from the tool grid below — STL to OBJ, OBJ to GLB, and more.

Drop your file

Drag and drop your file onto the converter. All processing runs entirely in your browser — your files never leave your machine.

Download the result

Your converted file downloads instantly. No upload, no account, no waiting. Nothing is sent to any server.

100% browser-side. We use the Three.js library to convert your files locally. No file is ever uploaded to a server. No account needed. Free forever.

12 free tools — all run in your browser

STL to OBJ Converter — Free, Browser-Side, No Upload

STL → OBJ

Convert STL files to OBJ format instantly in your browser. No upload, no account. Supports binary and ASCII STL. Free and private.

⚠ No units — STL stores raw coordinates with no unit metadata; confirm scale after conversion

Open tool

OBJ to STL Converter — Free, Browser-Side, No Upload

OBJ → STL

Convert OBJ files to STL format in your browser. Ideal for 3D printing. No file upload required. Supports single and multi-object OBJ files.

⚠ OBJExporter does not export MTL material files; geometry only, materials/textures are lost

Open tool

OBJ to GLB Converter — Free, Browser-Side, No Upload

OBJ → GLB

Convert OBJ files to GLB (binary glTF) format in your browser. No upload needed. Great for web 3D, AR, and game engines.

⚠ OBJ materials (MTL) are not preserved — if no MTL file is present, the UI will show a notice that materials are not retained

Open tool

GLB to OBJ Converter — Free, Browser-Side, No Upload

GLB → OBJ

Convert GLB files to OBJ format online, free and private. All processing happens in your browser. No server upload. Ideal for importing into modeling software.

⚠ Animations are lost — GLB animations are not supported in OBJ format

Open tool

PLY to STL Converter — Free, Browser-Side, No Upload

PLY → STL

Convert PLY mesh files to STL format in your browser for 3D printing. No upload required. Point cloud PLY files are not supported.

⚠ Texture references are not preserved — PLY to STL conversion loses any texture coordinate data

Open tool

GLTF / GLB Converter Online — Pack or Unpack, No Upload

GLTF / GLB → GLB / GLTF

Convert GLTF to GLB or unpack GLB to embedded GLTF JSON in your browser. Free, private, no upload, built for web 3D assets.

⚠ Single-file GLTF only — external .bin and texture files are not supported in the browser-only beta

Open tool

SVG to STL Converter — Free, Browser-Side, No Upload

SVG → STL

Extrude SVG paths into printable STL files in your browser. Adjust depth and scale. Free, private, no upload. Useful for logos and 2D designs.

⚠ 2D extrude / emboss only — this tool extrudes flat SVG paths into a 3D shape; it does NOT convert arbitrary SVG art into a full 3D model

Open tool

Image to STL Converter — Free Heightmap Relief, No Upload

Image → STL

Turn any image into a 3D-printable STL heightmap relief in your browser. Adjust depth and resolution. Free, private, no AI, no upload.

⚠ Heightmap / relief only — pixel brightness maps to surface height; this is NOT AI 3D reconstruction

Open tool

STL Repair Tool Online — Free, Browser-Side, No Upload

STL → repaired STL

Repair common STL mesh issues in your browser. Rebuild normals, remove degenerate triangles, and download a cleaned STL file.

⚠ Beta repair only — complex non-manifold meshes may still need a dedicated mesh editor

Open tool

STL Viewer Online — Free, Browser-Side, No Upload

STL → view

View and inspect STL files in your browser. Rotate, zoom, and pan 3D models. Supports files up to 200MB. Free, private, no upload required.

⚠ STL files have no unit metadata — displayed size reflects raw coordinate values

Open tool

3D Print Filament Calculator — Weight, Length, and Cost

Filament → length / cost

Calculate filament length, cost per meter, and estimated remaining material from spool weight, diameter, density, and price.

⚠ Estimates assume round filament with consistent diameter

Open tool

3D Printing Price Tool & Cost Calculator

Print job → estimated cost

Estimate 3D printing price from filament cost, print time, printer wattage, and electricity rate before adding labor or markup.

⚠ This calculator estimates direct material and electricity cost only

Open tool

Convert common 3D file formats in your browser.

How it works

Pick a tool

Drop your file

Download the result

12 free tools — all run in your browser

Convert common 3D file formats in your browser.

How it works

Pick a tool

Drop your file

Download the result

12 free tools — all run in your browser

Frequently Asked Questions

Frequently Asked Questions

Convert common 3D file formats in your browser.

How it works

Pick a tool

Drop your file

Download the result

12 free tools — all run in your browser

Convert common 3D file formats in your browser.

How it works

Pick a tool

Drop your file

Download the result

12 free tools — all run in your browser

Frequently Asked Questions

Is 3DFileKit really free?

Do my files get uploaded to a server?

Which 3D file formats are supported?

Do I need to create an account?

Something not working? Have a suggestion?

Frequently Asked Questions

Is 3DFileKit really free?

Do my files get uploaded to a server?

Which 3D file formats are supported?

Do I need to create an account?

Something not working? Have a suggestion?