3D
Format that packs glTF JSON and binary data into a single file. The first 4 bytes are glTF.
67 6C 54 46 glTFSIGNATURE = bytes.fromhex("676c5446")
OFFSET = 0
def is_glb(path: str) -> bool:
with open(path, "rb") as f:
f.seek(OFFSET)
head = f.read(len(SIGNATURE))
return head == SIGNATUREconst SIGNATURE = [0x67, 0x6c, 0x54, 0x46];
const OFFSET = 0;
// bytes: a Uint8Array / Buffer holding the start of the file
export function isGlb(bytes) {
return SIGNATURE.every((byte, i) => bytes[OFFSET + i] === byte);
}package fileid
import "bytes"
var isglbSignature = []byte{0x67, 0x6c, 0x54, 0x46}
const isglbOffset = 0
func IsGlb(b []byte) bool {
end := isglbOffset + len(isglbSignature)
if len(b) < end {
return false
}
return bytes.Equal(b[isglbOffset:end], isglbSignature)
}const SIGNATURE: &[u8] = &[0x67, 0x6c, 0x54, 0x46];
const OFFSET: usize = 0;
fn is_glb(bytes: &[u8]) -> bool {
bytes.get(OFFSET..OFFSET + SIGNATURE.len()) == Some(SIGNATURE)
}<?php
$signature = "\x67\x6c\x54\x46";
$offset = 0;
function is_glb(string $bytes): bool {
global $signature, $offset;
return substr($bytes, $offset, strlen($signature)) === $signature;
}Binary glTF is used in 3D viewers, asset pipelines, model conversion, avatar loading, and scene validation. Containers, extensions, binary chunks, and texture references all affect implementation behavior.
Untrusted input is not safe just because the format was detected. Account for parser exceptions, large files, unexpected encodings, and external references.
11 samples help test viewer loading, extension detection, and load time across file sizes.
Box Vertex Colors GLB is a Binary glTF sample based on Khronos glTF Sample Assets. It can be used to test downloads, parsers, previews, and file type detection.
01-box-vertex-colors.glb9c48227f33b0ba2fbcf23b98ebf60d1c8ae0c6e6c5281e0aa3cc58affee10382Animated Colors Cube GLB is a Binary glTF sample based on Khronos glTF Sample Assets. It can be used to test downloads, parsers, previews, and file type detection.
02-animated-colors-cube.glb995bb9db5bd011b64bc9fc2235c60e5455e2931e509db5e715b4d20afc5ba71eAnimated Morph Cube GLB is a Binary glTF sample based on Khronos glTF Sample Assets. It can be used to test downloads, parsers, previews, and file type detection.
03-animated-morph-cube.glb214ee56160a50dbf22543a1d66dbf860986e87f0efac3d89feac1359d0e6aeabSimple Instancing GLB is a Binary glTF sample based on Khronos glTF Sample Assets. It can be used to test downloads, parsers, previews, and file type detection.
04-simple-instancing.glb1c9425627481346a8c226118f7000db7cd7f80198e9f54331f8b664d16726f3fMetal Rough Spheres GLB is a Binary glTF sample based on Khronos glTF Sample Assets. It can be used to test downloads, parsers, previews, and file type detection.
05-metal-rough-spheres.glb5e677f260ec0f366967a6e9545de2f3dab2a160e307b9bcb9d050cd2028f63f8Glass Vase Flowers GLB is a Binary glTF sample based on Khronos glTF Sample Assets. It can be used to test downloads, parsers, previews, and file type detection.
06-glass-vase-flowers.glb430c9937664cfc74299205dcc388e4269bb688817f3d3866ef35aab71e93b852Clearcoat Wicker GLB is a Binary glTF sample based on Khronos glTF Sample Assets. It can be used to test downloads, parsers, previews, and file type detection.
07-clearcoat-wicker.glbf162b0cd7f8e6b7cef211eec57762165a78039676b8592ce1f965e2ddb34e843Avocado GLB is a Binary glTF sample based on Khronos glTF Sample Assets. It can be used to test downloads, parsers, previews, and file type detection.
08-avocado.glbccc9c3ce56423720b09399c2351537207cd5a65f859f9e6e2f30922762f3abd4Toy Car GLB is a Binary glTF sample based on Khronos glTF Sample Assets. It can be used to test downloads, parsers, previews, and file type detection.
09-toy-car.glb01a60862de55cd4b9f3acfab0b0def86451800f9c42467fcd61052c16cb9838cWater Bottle GLB is a Binary glTF sample based on Khronos glTF Sample Assets. It can be used to test downloads, parsers, previews, and file type detection.
10-water-bottle.glbb337e526fd6a162013c2984aeec163f5fbb4f717252724dfc3f3458bd51df94bBox GLB is a Binary glTF sample based on Khronos glTF Sample Assets. It can be used to test downloads, parsers, previews, and file type detection.
box.glbed52f7192b8311d700ac0ce80644e3852cd01537e4d62241b9acba023da3d54eBinary glTF files begin with the byte signature 67 6C 54 46 ("glTF"). Detect the format by reading these leading bytes rather than trusting the file extension alone.
The MIME type for Binary glTF is model/gltf-binary, model/gltf+binary.
Binary glTF files use the .glb extension. The extension is a convention only and does not guarantee the file contents, so combine it with signature and structure checks.