Portable Graymap Graphic (.pgm)
.pgm file signature | image/x-portable-graymap
Portable Graymap Graphic
Magic Bytes
Offset 0
50 35 0A
Sources: Wikipedia, Gary Kessler
All Known Signatures
3 signature variants are documented for .pgm files across multiple sources.
| Hex Signature | Offset | Sources |
|---|---|---|
| 50 35 0A | 0 | Wikipedia, Gary Kessler |
| 50 32 | 0 | Apache Tika |
| 50 32 0A | 0 | Wikipedia |
Extension
.pgm
MIME Type
image/x-portable-graymap
Byte Offset
0
Risk Level
Safe
Validation Code
How to validate .pgm files in Python
def is_pgm(file_path: str) -> bool:
"""Check if file is a valid PGM by magic bytes."""
signature = bytes([0x50, 0x35, 0x0A])
with open(file_path, "rb") as f:
return f.read(3) == signatureHow to validate .pgm files in Node.js
function isPGM(buffer: Buffer): boolean {
const signature = Buffer.from([0x50, 0x35, 0x0A]);
return buffer.subarray(0, 3).equals(signature);
}How to validate .pgm files in Go
func IsPGM(data []byte) bool {
signature := []byte{0x50, 0x35, 0x0A}
if len(data) < 3 {
return false
}
return bytes.Equal(data[:3], signature)
}API Endpoint
/api/v1/pgm
curl https://filesignature.org/api/v1/pgm
See the full API documentation for all endpoints and parameters.
Frequently Asked Questions
What is a .pgm file?
A .pgm file is a Portable Graymap Graphic file. Portable Graymap Graphic
What are the magic bytes for .pgm files?
The magic bytes for Portable Graymap Graphic files are 50 35 0A at byte offset 0. These bytes uniquely identify the file format regardless of the file extension.
How do I validate a .pgm file?
To validate a .pgm file, read the first bytes of the file and compare them against the known magic bytes (50 35 0A) at offset 0. This is more reliable than checking the file extension alone, as extensions can be renamed.
What is the MIME type for .pgm files?
The primary MIME type for .pgm files is image/x-portable-graymap.
Is it safe to open .pgm files?
Portable Graymap Graphic (.pgm) 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.