3D
glTF JSON is a 3d format commonly identified by .gltf. Use the listed signatures, MIME types, and structure notes to validate files beyond the extension.
7B {SIGNATURE = bytes.fromhex("7b")
OFFSET = 0
def is_gltf(path: str) -> bool:
with open(path, "rb") as f:
f.seek(OFFSET)
head = f.read(len(SIGNATURE))
return head == SIGNATUREconst SIGNATURE = [0x7b];
const OFFSET = 0;
// bytes: a Uint8Array / Buffer holding the start of the file
export function isGltf(bytes) {
return SIGNATURE.every((byte, i) => bytes[OFFSET + i] === byte);
}package fileid
import "bytes"
var isgltfSignature = []byte{0x7b}
const isgltfOffset = 0
func IsGltf(b []byte) bool {
end := isgltfOffset + len(isgltfSignature)
if len(b) < end {
return false
}
return bytes.Equal(b[isgltfOffset:end], isgltfSignature)
}const SIGNATURE: &[u8] = &[0x7b];
const OFFSET: usize = 0;
fn is_gltf(bytes: &[u8]) -> bool {
bytes.get(OFFSET..OFFSET + SIGNATURE.len()) == Some(SIGNATURE)
}<?php
$signature = "\x7b";
$offset = 0;
function is_gltf(string $bytes): bool {
global $signature, $offset;
return substr($bytes, $offset, strlen($signature)) === $signature;
}glTF JSON 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 glTF is a glTF JSON sample based on Khronos glTF Sample Assets. It can be used to test downloads, parsers, previews, and file type detection.
01-box-vertex-colors.gltfcb6215d4ef8df16a7c53205fd275dcea32dda247c6c1af60187436cadb98c28aAnimated Colors Cube glTF is a glTF JSON sample based on Khronos glTF Sample Assets. It can be used to test downloads, parsers, previews, and file type detection.
02-animated-colors-cube.gltf54e837a6976b351f4772fc57076a1edf549c3ab99c8bffb210a1c0b1c7e8fd93Animated Morph Cube glTF is a glTF JSON sample based on Khronos glTF Sample Assets. It can be used to test downloads, parsers, previews, and file type detection.
03-animated-morph-cube.gltf90af46348798c241bd74a0d880800f252c0b7afa6be734978c40e30a204647d8Simple Instancing glTF is a glTF JSON sample based on Khronos glTF Sample Assets. It can be used to test downloads, parsers, previews, and file type detection.
04-simple-instancing.gltf250b8242f684d8b743b18e35a0f59234f4b7308bbe514d14ab10ff702d9600e6Metal Rough Spheres glTF is a glTF JSON sample based on Khronos glTF Sample Assets. It can be used to test downloads, parsers, previews, and file type detection.
05-metal-rough-spheres.gltfcbb92e989cdfa3944f5c3c9c266746199492a0f0ca77b694d3859afea5123216Glass Vase Flowers glTF is a glTF JSON sample based on Khronos glTF Sample Assets. It can be used to test downloads, parsers, previews, and file type detection.
06-glass-vase-flowers.gltf8a1ddbf4a06eef0b18da3ec1980626b7d35e5d31edc9fe3d73781891b0f81a7eClearcoat Wicker glTF is a glTF JSON sample based on Khronos glTF Sample Assets. It can be used to test downloads, parsers, previews, and file type detection.
07-clearcoat-wicker.gltff522f62c246575fbedc7bf5b1ae81fad75e4f175745e899017a7021c8db6c72dAvocado glTF is a glTF JSON sample based on Khronos glTF Sample Assets. It can be used to test downloads, parsers, previews, and file type detection.
08-avocado.gltf39a339e95a6840e50b9d758d64e24892f02ef9e6ce9a61973c2b509a3f9834c0Toy Car glTF is a glTF JSON sample based on Khronos glTF Sample Assets. It can be used to test downloads, parsers, previews, and file type detection.
09-toy-car.gltf6d6eb3eb045bd15adf10dd60b6f79667743eb0683b327822d395e43c90bcd1c7Water Bottle glTF is a glTF JSON sample based on Khronos glTF Sample Assets. It can be used to test downloads, parsers, previews, and file type detection.
10-water-bottle.gltf598ad629764421c72557f5795c2de9ae0f6c2932cbd7390c685ffbaf583d3b98Box glTF is a glTF JSON sample based on Khronos glTF Sample Assets. It can be used to test downloads, parsers, previews, and file type detection.
box.gltf2803457f6adb3d3326a9ff4ac1cf3cdd4106fb6c78f18312c10da6bba14b7d77glTF JSON files begin with the byte signature 7B ("{"). Detect the format by reading these leading bytes rather than trusting the file extension alone.
The MIME type for glTF JSON is model/gltf+json.
glTF JSON files use the .gltf extension. The extension is a convention only and does not guarantee the file contents, so combine it with signature and structure checks.