Free glTF to GLB Converter

How to convert glTF to GLB

Step 1. Drop your glTF file on the converter above, or choose it from your device. If the model comes with other files, such as pictures, a .bin, or a .mtl, choose them in the same go.

Step 2. Look at the preview. If the model lies on its side, change the up direction to match your file.

Step 3. Press the download button. The GLB file is saved to your device, named like your original with .glb at the end.

Turning a folder of glTF files into one file

A .gltf model is often a folder: the .gltf text, a .bin with the shapes, and a set of pictures. Many sites, apps, and mail systems want a single file. A GLB holds the same model in one piece, so nothing goes missing when you upload or send it.

Open the folder, select the .gltf and the files beside it, and drop them all on the converter at once. Hold Ctrl or Shift to select several files in the file window. The converter matches names and ignores folders, so keep the file names as they are. The result has the same shapes, materials, textures, and animation as the original.

What survives the conversion

Shapes. Every triangle is read, whether it is stored in the .gltf or in a .bin file you pick with it. Every triangle is written, with normals and UV coordinates.

Colors and materials. Colors, normal maps, and transparency are read. Materials are written as standard glTF materials: color, color texture, normal map, glow, and transparency.

Textures. Pictures stored inside the file are read, and so are pictures you pick together with the .gltf. Pictures are packed into the file.

Animation. Animation clips are read. Animation clips are kept.

Units and direction. glTF files are always in meters. The file is in meters, with Y pointing up.

If something looks wrong

Choose the .gltf and every file that goes with it in one go: the .bin and the pictures. Hold Ctrl or Shift to choose several in the file window, or drag them all in together.

The file names must match what the .gltf says. Folders and capital letters do not matter, but a renamed file cannot be found.

A glTF that uses Draco or Meshopt compression opens, and the GLB is written without compression, so it may be larger than the original.

Extensions beyond the common glTF set, such as some advanced material effects, may be dropped when the file is written again.

If your app shows the model sideways, check its import axis. A GLB has Y pointing up.

If your browser cannot draw 3D, there is no preview, but the conversion still works.

Your file stays on your device

The converter reads your glTF file in the browser and writes the GLB file there too. Nothing is uploaded, and the page does not load anything the file points to, other than files you choose yourself. The page counts a visit like any other page, but it never sees the file's name or contents.