JPEG/JFIF graphics
image/jpeg
Magic Bytes
Offset: 0
FF D8 FF
The JPEG File Interchange Format (JFIF) is a minimal bitmap graphics standard defined by C-Cube Microsystems to facilitate the exchange of JPEG-encoded images. This format establishes a device-independent method for storing and sharing digital photography across different operating systems and web applications. While the specific file extension is less common than standard JPEG today, the underlying specification remains the historical foundation for compatibility and color space definition in digital imaging.
Validation Code
How to validate .jfif files in Python
Python
def is_jfif(file_path: str) -> bool:
"""Check if file is a valid JFIF by magic bytes."""
signature = bytes([0xFF, 0xD8, 0xFF])
with open(file_path, "rb") as f:
return f.read(3) == signatureHow to validate .jfif files in Node.js
Node.js
function isJFIF(buffer: Buffer): boolean {
const signature = Buffer.from([0xFF, 0xD8, 0xFF]);
return buffer.subarray(0, 3).equals(signature);
}
Go
func IsJFIF(data []byte) bool {
signature := []byte{0xFF, 0xD8, 0xFF}
if len(data) < 3 {
return false
}
return bytes.Equal(data[:3], signature)
}API Endpoint
GET
/api/v1/jfif
curl https://filesignature.org/api/v1/jfif