Generic JPEG Image file magic bytes (.jpeg)
.jpeg file signature: FF D8 FF | image/jpeg
Category: Images
JPEG (Joint Photographic Experts Group) is a raster image format developed by the Joint Photographic Experts Group and standardized by ISO and IEC for compressing photographic images. It is commonly used for digital photography, web images, email attachments, and general-purpose image sharing across devices and platforms. JPEG is a legacy but still widely supported format; its lossy compression can reduce image quality over repeated saves, and malformed files may occasionally trigger parser vulnerabilities in image viewers.
Magic Bytes
Offset 0
FF D8 FF
Sources: Apache Tika
All Known Signatures
4 signature variants are documented for .jpeg files across multiple sources.
| Hex Signature | Offset | Sources |
|---|---|---|
| FF D8 FF | 0 | Apache Tika |
| FF D8 FF DB | 0 | Wikipedia |
| FF D8 | 0 | Gary Kessler |
| FF D8 FF E0 4A 46 49 46 00 | 0 | Gary Kessler |
Validation Code
How to validate .jpeg files in Python
def is_jpeg(file_path: str) -> bool:
"""Check if file is a valid JPEG by magic bytes."""
signature = bytes([0xFF, 0xD8, 0xFF])
with open(file_path, "rb") as f:
return f.read(3) == signatureHow to validate .jpeg files in Node.js
function isJPEG(buffer: Buffer): boolean {
const signature = Buffer.from([0xFF, 0xD8, 0xFF]);
return buffer.subarray(0, 3).equals(signature);
}How to validate .jpeg files in Go
func IsJPEG(data []byte) bool {
signature := []byte{0xFF, 0xD8, 0xFF}
if len(data) < 3 {
return false
}
return bytes.Equal(data[:3], signature)
}API Endpoint
/api/v1/jpeg
curl https://filesignature.org/api/v1/jpeg
See the full API documentation for all endpoints and parameters.
Related Formats
Frequently Asked Questions
What is a .jpeg file?
A .jpeg file is a Generic JPEG Image file. JPEG (Joint Photographic Experts Group) is a raster image format developed by the Joint Photographic Experts Group and standardized by ISO and IEC for compressing photographic images. It is commonly used for digital photography, web images, email attachments, and general-purpose image sharing across devices and platforms. JPEG is a legacy but still widely supported format; its lossy compression can reduce image quality over repeated saves, and malformed files may occasionally trigger parser vulnerabilities in image viewers.
What are the magic bytes for .jpeg files?
The magic bytes for Generic JPEG Image file (.jpeg) files are FF D8 FF at byte offset 0. These bytes identify the file format more reliably than the extension alone.
How do I validate a .jpeg file?
To validate a .jpeg 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 .jpeg files?
The primary MIME type for .jpeg files is image/jpeg.
Is it safe to open .jpeg files?
Generic JPEG Image file (.jpeg) 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.