Windows
image/bmp
Magic Bytes
Offset: 0
42 4D
The Windows Bitmap (BMP) is a raster graphics image file format developed by Microsoft for storing device-independent digital images. It is primarily used for uncompressed storage of simple graphics, icons, and local system resources within the Windows operating system environment. Although largely superseded by compressed formats like JPEG and PNG for network transmission, it remains a stable legacy format considered safe for general use because it does not typically support executable content.
Validation Code
How to validate .bmp files in Python
Python
def is_bmp(file_path: str) -> bool:
"""Check if file is a valid BMP by magic bytes."""
signature = bytes([0x42, 0x4D])
with open(file_path, "rb") as f:
return f.read(2) == signatureHow to validate .bmp files in Node.js
Node.js
function isBMP(buffer: Buffer): boolean {
const signature = Buffer.from([0x42, 0x4D]);
return buffer.subarray(0, 2).equals(signature);
}
Go
func IsBMP(data []byte) bool {
signature := []byte{0x42, 0x4D}
if len(data) < 2 {
return false
}
return bytes.Equal(data[:2], signature)
}API Endpoint
GET
/api/v1/bmp
curl https://filesignature.org/api/v1/bmp