glTF Viewer

Open a glTF model in your browser together with the files it needs. A .gltf is a text file that points to other files: a .bin with the geometry and image files for the textures. Select them all at once, drop the folder, or click Open a folder, and the viewer matches every file the model asks for. Anything that is missing is listed by the exact name written in the .gltf, so you know what to look for, and the model still opens when only a texture is missing. Basic checks look for broken references, sizes that run past the end of a buffer and position bounds that do not match the data, and a JSON tree lets you read the file level by level. Animations, morph targets, materials and textures are shown as made. GLB files open too. Nothing is uploaded.

100% private — everything runs in your browser. Everything runs in your browser; your model files are never uploaded.

How to open a glTF file online

1. Select the .gltf with its .bin and texture files (or drop the folder, or click Open a folder). Or click Try a sample.
2. Read Files the model refers to: each file is found or listed as missing by name.
3. Drag to orbit and scroll to zoom; play animations if the model has them.
4. Check the Checks list and the glTF JSON tree, then save the view as a PNG.

What you can use it for

• Open a glTF that came as a folder or a ZIP (unzip it first) with separate textures
• Find out which texture or .bin file a glTF is missing
• Check a glTF exported from a 3D program before loading it in your own app or game
• Read the JSON of a glTF without a code editor
• Check that animations and materials came through an export
• Measure a glTF model in metres, millimetres or inches

How the files of a glTF fit together

File the sample .gltf refers to	Kind	With the folder	Without the texture	Only the .gltf
scene.bin	buffer	found	found	missing
textures/checker.png	image	found	missing	missing

Computed by the viewer’s own matching code from the sample model’s files (24 triangles, 2 animations). A missing texture still lets the model open in grey; a missing .bin stops it, and the viewer says which file to add.

What the viewer checks

Check	Why it matters
Every file the .gltf refers to (buffers, images)	Found by path or name, missing, or a web address that is not fetched
References between parts (materials, meshes, textures, images, nodes)	A broken reference can stop a model from loading in other apps
Buffer views and accessors fit inside their data	Data that runs past the end of a buffer is an error in the file
POSITION min / max present and equal to the data	The glTF 2.0 specification requires them and says they must match
Required extensions	Lists any the file needs that this viewer cannot show (for example KTX2 textures)

These are quick checks made in your browser, not the full Khronos glTF Validator.

What you can do with a model

Control	What it does
Orbit, zoom, pan	Drag to turn, scroll or pinch to zoom, right-drag (or two fingers) to pan
Look from	Corner, front, back, left, right, top or bottom view
Wireframe, floor grid, bounding box	See the triangles, the size against a grid (square size shown) and the box around the model
Units and up axis	Read the file in mm, cm, m, inches or feet; stand the model on Y or Z
Shading normals	As in the file, flat (faceted) or smooth
Parts	Show or hide each object, group or mesh
Save view as PNG	The current view at the view size or twice that, background optional

Units and axes

glTF rule	What the viewer does
Distances are in metres	Shows the size in mm and inches (0.04 units = 40 mm); change Units in the file for models exported at the wrong scale
+Y is up, the front faces +Z	Stands the model on Y; switch Up axis to Z for files from Z-up programs
Binary data and images may be embedded as data URIs	Opens them from the .gltf alone and lists their sizes

Next steps

Need the model for 3D printing? GLB to STL also reads .gltf files and writes millimetres with Z up; check the result in the STL viewer. Tidy a .gltf’s JSON with the JSON Formatter, or shrink its textures with the Image Compressor.

Sources

Sources: Khronos Group: glTF 2.0 Specification (file extensions, data URIs, units, accessor bounds).

Frequently asked questions

Why does my glTF not show its textures?

The textures are separate image files, and they were not added with the .gltf. Select the .gltf, the .bin and the images together, or open the folder. The list of files the model refers to names each missing file exactly as the .gltf writes it.

What is the .bin file?

It holds the binary data of a .gltf: vertex positions, normals, texture coordinates, triangle indices and animation keys. Without it the model has no shape, so the viewer asks for it by name instead of opening an empty scene.

Can I drop a whole folder?

Yes. Drop the folder on the box or click Open a folder. Files in sub-folders (for example textures/wood.png) are matched by their path, and by file name if the path differs.

What is the difference between glTF and GLB?

Both are the same glTF 2.0 format. A .gltf is JSON text that usually points to separate files; a .glb packs the JSON, the binary data and usually the textures into one file. Both open here.

What do the checks look for?

References to materials, meshes, textures, images, buffers or nodes that do not exist, buffer views and accessors that run past the end of their data, a missing min/max on positions, min/max values that do not match the data, and required extensions this viewer cannot show. It is a quick check, not the full Khronos glTF Validator.

Does it fetch textures from the web?

No. If a .gltf points to an image on a web address, the viewer does not download it, to keep your work private; it lists the address and shows grey instead.

Can I save a picture of the model?

Yes. Turn the model to the view you want and click Save view as PNG: at the view size or twice that, with a transparent background if you choose it.

Is it free?

Yes. There is no sign-up, no watermark and no file limit beyond what your device can hold.

Are my files uploaded?

No. The model and its files are read by JavaScript in your browser and never leave your device. Only the 3D engine (three.js) is downloaded from a public CDN. A texture that points to a web address is not fetched: it is listed and shown in grey.