Quark Express document
application/octet-stream
Magic Bytes
Offset: 0
00 00 49 49 58 50 52 00 00 4D 4D 58 50 52
The QuarkXPress Document (QXD) is a proprietary desktop publishing file format developed and maintained by Quark Inc. It is primarily used for creating complex page layouts for print and digital media, including newspapers, magazines, brochures, and catalogs. While largely superseded by the XML-based QXP format in later versions, QXD remains relevant for archiving legacy layout data and presents a low security risk as a non-executable binary format used in older publishing workflows.
Validation Code
How to validate .qxd files in Python
Python
def is_qxd(file_path: str) -> bool:
"""Check if file is a valid QXD by magic bytes."""
signature = bytes([0x00, 0x00, 0x49, 0x49, 0x58, 0x50, 0x52, 0x00, 0x00, 0x4D, 0x4D, 0x58, 0x50, 0x52])
with open(file_path, "rb") as f:
return f.read(14) == signatureHow to validate .qxd files in Node.js
Node.js
function isQXD(buffer: Buffer): boolean {
const signature = Buffer.from([0x00, 0x00, 0x49, 0x49, 0x58, 0x50, 0x52, 0x00, 0x00, 0x4D, 0x4D, 0x58, 0x50, 0x52]);
return buffer.subarray(0, 14).equals(signature);
}
Go
func IsQXD(data []byte) bool {
signature := []byte{0x00, 0x00, 0x49, 0x49, 0x58, 0x50, 0x52, 0x00, 0x00, 0x4D, 0x4D, 0x58, 0x50, 0x52}
if len(data) < 14 {
return false
}
return bytes.Equal(data[:14], signature)
}API Endpoint
GET
/api/v1/qxd
curl https://filesignature.org/api/v1/qxd