GLB magic bytes (.glb)
.glb file signature: 67 6C 54 46 | application/octet-stream
Category: CAD & 3D
GLB is the binary version of the glTF 2.0 3D asset format, standardized and maintained by the Khronos Group. It is used to package 3D models, scenes, materials, textures, and animations for web graphics, game engines, augmented reality, and virtual reality workflows. GLB files are generally safe, but as with other media assets, malformed files can expose vulnerabilities in importers or rendering libraries.
Magic Bytes
Offset 0
67 6C 54 46
Sources: Wikipedia
Validation Code
How to validate .glb files in Python
def is_glb(file_path: str) -> bool:
"""Check if file is a valid GLB by magic bytes."""
signature = bytes([0x67, 0x6C, 0x54, 0x46])
with open(file_path, "rb") as f:
return f.read(4) == signatureHow to validate .glb files in Node.js
function isGLB(buffer: Buffer): boolean {
const signature = Buffer.from([0x67, 0x6C, 0x54, 0x46]);
return buffer.subarray(0, 4).equals(signature);
}How to validate .glb files in Go
func IsGLB(data []byte) bool {
signature := []byte{0x67, 0x6C, 0x54, 0x46}
if len(data) < 4 {
return false
}
return bytes.Equal(data[:4], signature)
}API Endpoint
/api/v1/glb
curl https://filesignature.org/api/v1/glb
See the full API documentation for all endpoints and parameters.
Related Formats
Frequently Asked Questions
What is a .glb file?
A .glb file is identified by the magic bytes 67 6C 54 46 at byte offset 0. GLB is the binary version of the glTF 2.0 3D asset format, standardized and maintained by the Khronos Group. It is used to package 3D models, scenes, materials, textures, and animations for web graphics, game engines, augmented reality, and virtual reality workflows. GLB files are generally safe, but as with other media assets, malformed files can expose vulnerabilities in importers or rendering libraries.
What are the magic bytes for .glb files?
The magic bytes for GLB (.glb) files are 67 6C 54 46 at byte offset 0. These bytes identify the file format more reliably than the extension alone.
How do I validate a .glb file?
To validate a .glb file, read the first bytes of the file and compare them against the known magic bytes (67 6C 54 46) at offset 0. This is more reliable than checking the file extension alone, as extensions can be renamed.
What is the MIME type for .glb files?
There is no officially registered MIME type for .glb files. Systems typically use application/octet-stream as a generic fallback when handling this format.
Is it safe to open .glb files?
GLB (.glb) files are generally safe to open. They are classified as low risk because they primarily contain data rather than executable code. However, always ensure files come from a trusted source.