JPEG/JFIF graphics fileTrailer:FF D9 (.jfif)
.jfif file signature | image/jpeg
JPEG/JFIF graphics fileTrailer:FF D9(ÿÙ)
Magic Bytes
Offset 0
FF D8 FF
Sources: Apache Tika
All Known Signatures
2 signature variants are documented for .jfif files across multiple sources.
| Hex Signature | Offset | Sources |
|---|---|---|
| FF D8 FF | 0 | Apache Tika |
| FF D8 FF E0 4A 46 49 46 00 | 0 | Gary Kessler |
Extension
.jfif
MIME Type
image/jpeg
Byte Offset
0
Risk Level
Safe
Validation Code
How to validate .jfif files in 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
function isJFIF(buffer: Buffer): boolean {
const signature = Buffer.from([0xFF, 0xD8, 0xFF]);
return buffer.subarray(0, 3).equals(signature);
}How to validate .jfif files in 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
/api/v1/jfif
curl https://filesignature.org/api/v1/jfif
See the full API documentation for all endpoints and parameters.
Frequently Asked Questions
What is a .jfif file?
A .jfif file is a JPEG/JFIF graphics fileTrailer:FF D9 file. JPEG/JFIF graphics fileTrailer:FF D9(ÿÙ)
What are the magic bytes for .jfif files?
The magic bytes for JPEG/JFIF graphics fileTrailer:FF D9 files are FF D8 FF at byte offset 0. These bytes uniquely identify the file format regardless of the file extension.
How do I validate a .jfif file?
To validate a .jfif file, read the first bytes of the file and compare them against the known magic bytes (FF D8 FF) at offset 0. This is more reliable than checking the file extension alone, as extensions can be renamed.
What is the MIME type for .jfif files?
The primary MIME type for .jfif files is image/jpeg.
Is it safe to open .jfif files?
JPEG/JFIF graphics fileTrailer:FF D9 (.jfif) 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.