CR3 (.cr3)
.cr3 file signature | image/x-canon-cr3
Magic Bytes
Offset 4
66 74 79 70 63 72 78 20
Sources: Apache Tika
All Known Signatures
2 signature variants are documented for .cr3 files across multiple sources.
| Hex Signature | Offset | Sources |
|---|---|---|
| 66 74 79 70 63 72 78 20 | 4 | Apache Tika |
| 66 74 79 70 63 72 78 43 52 | 0 | Wikipedia |
Extension
.cr3
MIME Type
image/x-canon-cr3
Byte Offset
4
Risk Level
Safe
Validation Code
How to validate .cr3 files in Python
def is_cr3(file_path: str) -> bool:
"""Check if file is a valid CR3 by magic bytes."""
signature = bytes([0x66, 0x74, 0x79, 0x70, 0x63, 0x72, 0x78, 0x20])
with open(file_path, "rb") as f:
return f.read(8) == signatureHow to validate .cr3 files in Node.js
function isCR3(buffer: Buffer): boolean {
const signature = Buffer.from([0x66, 0x74, 0x79, 0x70, 0x63, 0x72, 0x78, 0x20]);
return buffer.subarray(0, 8).equals(signature);
}How to validate .cr3 files in Go
func IsCR3(data []byte) bool {
signature := []byte{0x66, 0x74, 0x79, 0x70, 0x63, 0x72, 0x78, 0x20}
if len(data) < 8 {
return false
}
return bytes.Equal(data[:8], signature)
}API Endpoint
/api/v1/cr3
curl https://filesignature.org/api/v1/cr3
See the full API documentation for all endpoints and parameters.
Frequently Asked Questions
What is a .cr3 file?
A .cr3 file is a CR3 file.
What are the magic bytes for .cr3 files?
The magic bytes for CR3 files are 66 74 79 70 63 72 78 20 at byte offset 4. These bytes uniquely identify the file format regardless of the file extension.
How do I validate a .cr3 file?
To validate a .cr3 file, read the first bytes of the file and compare them against the known magic bytes (66 74 79 70 63 72 78 20) at offset 4. This is more reliable than checking the file extension alone, as extensions can be renamed.
What is the MIME type for .cr3 files?
The primary MIME type for .cr3 files is image/x-canon-cr3.
Is it safe to open .cr3 files?
CR3 (.cr3) 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.