GenericAutoCADdrawing file (.dwg)
.dwg file signature | image/vnd.dwg
GenericAutoCADdrawing file
Magic Bytes
Offset 0
4D 43 30 2E 30
Sources: Apache Tika
All Known Signatures
9 signature variants are documented for .dwg files across multiple sources.
| Hex Signature | Offset | Sources |
|---|---|---|
| 4D 43 30 2E 30 | 0 | Apache Tika |
| 41 43 31 2E 32 | 0 | Apache Tika |
| 41 43 31 2E 34 30 | 0 | Apache Tika |
| 41 43 31 2E 35 30 | 0 | Apache Tika |
| 41 43 32 2E 31 30 | 0 | Apache Tika |
| 41 43 32 2E 32 31 | 0 | Apache Tika |
| 41 43 32 2E 32 32 | 0 | Apache Tika |
| 41 43 30 30 30 30 | 0 | Apache Tika |
| 41 43 | 0 | Gary Kessler |
Extension
.dwg
MIME Type
image/vnd.dwg
Byte Offset
0
Risk Level
Safe
Validation Code
How to validate .dwg files in Python
def is_dwg(file_path: str) -> bool:
"""Check if file is a valid DWG by magic bytes."""
signature = bytes([0x4D, 0x43, 0x30, 0x2E, 0x30])
with open(file_path, "rb") as f:
return f.read(5) == signatureHow to validate .dwg files in Node.js
function isDWG(buffer: Buffer): boolean {
const signature = Buffer.from([0x4D, 0x43, 0x30, 0x2E, 0x30]);
return buffer.subarray(0, 5).equals(signature);
}How to validate .dwg files in Go
func IsDWG(data []byte) bool {
signature := []byte{0x4D, 0x43, 0x30, 0x2E, 0x30}
if len(data) < 5 {
return false
}
return bytes.Equal(data[:5], signature)
}API Endpoint
/api/v1/dwg
curl https://filesignature.org/api/v1/dwg
See the full API documentation for all endpoints and parameters.
Frequently Asked Questions
What is a .dwg file?
A .dwg file is a GenericAutoCADdrawing file file. GenericAutoCADdrawing file
What are the magic bytes for .dwg files?
The magic bytes for GenericAutoCADdrawing file files are 4D 43 30 2E 30 at byte offset 0. These bytes uniquely identify the file format regardless of the file extension.
How do I validate a .dwg file?
To validate a .dwg file, read the first bytes of the file and compare them against the known magic bytes (4D 43 30 2E 30) at offset 0. This is more reliable than checking the file extension alone, as extensions can be renamed.
What is the MIME type for .dwg files?
The primary MIME type for .dwg files is image/vnd.dwg.
Is it safe to open .dwg files?
GenericAutoCADdrawing file (.dwg) 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.