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AFM (.afm)

.afm file signature | application/x-font-adobe-metric

Safe

Magic Bytes

Offset 0
53 74 61 72 74 46 6F 6E 74 4D 65 74 72 69 63 73

Sources: Apache Tika

Extension

.afm

MIME Type

application/x-font-adobe-metric

Byte Offset

0

Risk Level

Safe

Validation Code

How to validate .afm files in Python

Python 
def is_afm(file_path: str) -> bool:
    """Check if file is a valid AFM by magic bytes."""
    signature = bytes([0x53, 0x74, 0x61, 0x72, 0x74, 0x46, 0x6F, 0x6E, 0x74, 0x4D, 0x65, 0x74, 0x72, 0x69, 0x63, 0x73])
    with open(file_path, "rb") as f:
        return f.read(16) == signature

How to validate .afm files in Node.js

Node.js 
function isAFM(buffer: Buffer): boolean {
  const signature = Buffer.from([0x53, 0x74, 0x61, 0x72, 0x74, 0x46, 0x6F, 0x6E, 0x74, 0x4D, 0x65, 0x74, 0x72, 0x69, 0x63, 0x73]);
  return buffer.subarray(0, 16).equals(signature);
}

How to validate .afm files in Go

Go 
func IsAFM(data []byte) bool {
    signature := []byte{0x53, 0x74, 0x61, 0x72, 0x74, 0x46, 0x6F, 0x6E, 0x74, 0x4D, 0x65, 0x74, 0x72, 0x69, 0x63, 0x73}
    if len(data) < 16 {
        return false
    }
    return bytes.Equal(data[:16], signature)
}

API Endpoint

GET /api/v1/afm
curl https://filesignature.org/api/v1/afm

See the full API documentation for all endpoints and parameters.

Frequently Asked Questions

What is a .afm file?

A .afm file is a AFM file.

What are the magic bytes for .afm files?

The magic bytes for AFM files are 53 74 61 72 74 46 6F 6E 74 4D 65 74 72 69 63 73 at byte offset 0. These bytes uniquely identify the file format regardless of the file extension.

How do I validate a .afm file?

To validate a .afm file, read the first bytes of the file and compare them against the known magic bytes (53 74 61 72 74 46 6F 6E 74 4D 65 74 72 69 63 73) at offset 0. This is more reliable than checking the file extension alone, as extensions can be renamed.

What is the MIME type for .afm files?

The primary MIME type for .afm files is application/x-font-adobe-metric.

Is it safe to open .afm files?

AFM (.afm) 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.