AXX (.axx)

.axx file signature | application/x-axcrypt

AXX is an encrypted archive file format created and maintained by AxCrypt, the file encryption utility for Windows and related platforms. It is used to protect individual files or bundles of files for secure storage, transfer, and sharing, and is typically opened within AxCrypt or compatible decryption tools. The format is generally considered safe, but access depends on the correct password or key, and older archives may require legacy software support.

Safe

Magic Bytes

Offset 0


              C0 B9 07 2E 4F 93 F1 46 A0 15 79 2C A1 D9 E8 21

Sources: Apache Tika

Extension

.axx

MIME Type

application/x-axcrypt

Byte Offset

Risk Level

Safe

Validation Code

How to validate .axx files in Python

Python

def is_axx(file_path: str) -> bool:
    """Check if file is a valid AXX by magic bytes."""
    signature = bytes([0xC0, 0xB9, 0x07, 0x2E, 0x4F, 0x93, 0xF1, 0x46, 0xA0, 0x15, 0x79, 0x2C, 0xA1, 0xD9, 0xE8, 0x21])
    with open(file_path, "rb") as f:
        return f.read(16) == signature

How to validate .axx files in Node.js

Node.js

function isAXX(buffer: Buffer): boolean {
  const signature = Buffer.from([0xC0, 0xB9, 0x07, 0x2E, 0x4F, 0x93, 0xF1, 0x46, 0xA0, 0x15, 0x79, 0x2C, 0xA1, 0xD9, 0xE8, 0x21]);
  return buffer.subarray(0, 16).equals(signature);
}

How to validate .axx files in Go

func IsAXX(data []byte) bool {
    signature := []byte{0xC0, 0xB9, 0x07, 0x2E, 0x4F, 0x93, 0xF1, 0x46, 0xA0, 0x15, 0x79, 0x2C, 0xA1, 0xD9, 0xE8, 0x21}
    if len(data) < 16 {
        return false
    }
    return bytes.Equal(data[:16], signature)
}

API Endpoint

GET /api/v1/axx


              curl https://filesignature.org/api/v1/axx

See the full API documentation for all endpoints and parameters.

Frequently Asked Questions

What is a .axx file?

A .axx file is identified by the magic bytes C0 B9 07 2E 4F 93 F1 46 A0 15 79 2C A1 D9 E8 21 at byte offset 0. AXX is an encrypted archive file format created and maintained by AxCrypt, the file encryption utility for Windows and related platforms. It is used to protect individual files or bundles of files for secure storage, transfer, and sharing, and is typically opened within AxCrypt or compatible decryption tools. The format is generally considered safe, but access depends on the correct password or key, and older archives may require legacy software support.

What are the magic bytes for .axx files?

The magic bytes for AXX files are C0 B9 07 2E 4F 93 F1 46 A0 15 79 2C A1 D9 E8 21 at byte offset 0. These bytes uniquely identify the file format regardless of the file extension.

How do I validate a .axx file?

To validate a .axx file, read the first bytes of the file and compare them against the known magic bytes (C0 B9 07 2E 4F 93 F1 46 A0 15 79 2C A1 D9 E8 21) at offset 0. This is more reliable than checking the file extension alone, as extensions can be renamed.

What is the MIME type for .axx files?

The primary MIME type for .axx files is application/x-axcrypt.

Is it safe to open .axx files?

AXX (.axx) 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.