MAFF (.maff)
.maff file signature | application/x-maff
MAFF (Mozilla Archive Format) is a web archive file format developed for Mozilla-based browsers and maintained by the open-source Mozilla Archive Format project. It was used to save complete web pages, including associated assets, for offline viewing and later restoration in Firefox and related applications. The format is legacy and largely obsolete; as a ZIP-based container, it should be handled cautiously because archived content may include active scripts or embedded files.
Magic Bytes
Offset 0
50 4B 03 04
Sources: Wikipedia
All Known Signatures
3 signature variants are documented for .maff files across multiple sources.
Extension
.maff
MIME Type
application/x-maff
Byte Offset
0
Risk Level
Safe
Validation Code
How to validate .maff files in Python
def is_maff(file_path: str) -> bool:
"""Check if file is a valid MAFF by magic bytes."""
signature = bytes([0x50, 0x4B, 0x03, 0x04])
with open(file_path, "rb") as f:
return f.read(4) == signatureHow to validate .maff files in Node.js
function isMAFF(buffer: Buffer): boolean {
const signature = Buffer.from([0x50, 0x4B, 0x03, 0x04]);
return buffer.subarray(0, 4).equals(signature);
}How to validate .maff files in Go
func IsMAFF(data []byte) bool {
signature := []byte{0x50, 0x4B, 0x03, 0x04}
if len(data) < 4 {
return false
}
return bytes.Equal(data[:4], signature)
}API Endpoint
/api/v1/maff
curl https://filesignature.org/api/v1/maff
See the full API documentation for all endpoints and parameters.
Frequently Asked Questions
What is a .maff file?
A .maff file is identified by the magic bytes 50 4B 03 04 at byte offset 0. MAFF (Mozilla Archive Format) is a web archive file format developed for Mozilla-based browsers and maintained by the open-source Mozilla Archive Format project. It was used to save complete web pages, including associated assets, for offline viewing and later restoration in Firefox and related applications. The format is legacy and largely obsolete; as a ZIP-based container, it should be handled cautiously because archived content may include active scripts or embedded files.
What are the magic bytes for .maff files?
The magic bytes for MAFF files are 50 4B 03 04 at byte offset 0. These bytes uniquely identify the file format regardless of the file extension.
How do I validate a .maff file?
To validate a .maff file, read the first bytes of the file and compare them against the known magic bytes (50 4B 03 04) at offset 0. This is more reliable than checking the file extension alone, as extensions can be renamed.
What is the MIME type for .maff files?
The primary MIME type for .maff files is application/x-maff.
Is it safe to open .maff files?
MAFF (.maff) 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.