FAXX (.faxx)
.faxx file signature | application/octet-stream
FAXX is a file format whose creator and maintenance authority are not publicly documented. It is associated with fax-oriented document data and may be used to store or exchange digitized facsimile content in software that supports the format. The format is considered low risk, and no major security issues are commonly associated with it, though files from untrusted sources should still be opened carefully.
Magic Bytes
Offset 0
46 4F 52 4D
Sources: Wikipedia
All Known Signatures
2 signature variants are documented for .faxx files across multiple sources.
Extension
.faxx
MIME Type
application/octet-stream
Byte Offset
0
Risk Level
Safe
Validation Code
How to validate .faxx files in Python
def is_faxx(file_path: str) -> bool:
"""Check if file is a valid FAXX by magic bytes."""
signature = bytes([0x46, 0x4F, 0x52, 0x4D])
with open(file_path, "rb") as f:
return f.read(4) == signatureHow to validate .faxx files in Node.js
function isFAXX(buffer: Buffer): boolean {
const signature = Buffer.from([0x46, 0x4F, 0x52, 0x4D]);
return buffer.subarray(0, 4).equals(signature);
}How to validate .faxx files in Go
func IsFAXX(data []byte) bool {
signature := []byte{0x46, 0x4F, 0x52, 0x4D}
if len(data) < 4 {
return false
}
return bytes.Equal(data[:4], signature)
}API Endpoint
/api/v1/faxx
curl https://filesignature.org/api/v1/faxx
See the full API documentation for all endpoints and parameters.
Frequently Asked Questions
What is a .faxx file?
A .faxx file is identified by the magic bytes 46 4F 52 4D at byte offset 0. FAXX is a file format whose creator and maintenance authority are not publicly documented. It is associated with fax-oriented document data and may be used to store or exchange digitized facsimile content in software that supports the format. The format is considered low risk, and no major security issues are commonly associated with it, though files from untrusted sources should still be opened carefully.
What are the magic bytes for .faxx files?
The magic bytes for FAXX files are 46 4F 52 4D at byte offset 0. These bytes uniquely identify the file format regardless of the file extension.
How do I validate a .faxx file?
To validate a .faxx file, read the first bytes of the file and compare them against the known magic bytes (46 4F 52 4D) at offset 0. This is more reliable than checking the file extension alone, as extensions can be renamed.
What is the MIME type for .faxx files?
There is no officially registered MIME type for .faxx files. Systems typically use application/octet-stream as a generic fallback when handling this format.
Is it safe to open .faxx files?
FAXX (.faxx) 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.