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WHL (.whl)

.whl file signature | application/octet-stream

zip file formatand formats based on it, such asEPUB,JAR,ODF,OOXML

Safe

Magic Bytes

Offset 0
50 4B 03 04 50 4B 05 06 50 4B 07 08

Sources: Wikipedia

Extension

.whl

MIME Type

application/octet-stream

Byte Offset

0

Risk Level

Safe

Validation Code

How to validate .whl files in Python

Python 
def is_whl(file_path: str) -> bool:
    """Check if file is a valid WHL by magic bytes."""
    signature = bytes([0x50, 0x4B, 0x03, 0x04, 0x50, 0x4B, 0x05, 0x06, 0x50, 0x4B, 0x07, 0x08])
    with open(file_path, "rb") as f:
        return f.read(12) == signature

How to validate .whl files in Node.js

Node.js 
function isWHL(buffer: Buffer): boolean {
  const signature = Buffer.from([0x50, 0x4B, 0x03, 0x04, 0x50, 0x4B, 0x05, 0x06, 0x50, 0x4B, 0x07, 0x08]);
  return buffer.subarray(0, 12).equals(signature);
}

How to validate .whl files in Go

Go 
func IsWHL(data []byte) bool {
    signature := []byte{0x50, 0x4B, 0x03, 0x04, 0x50, 0x4B, 0x05, 0x06, 0x50, 0x4B, 0x07, 0x08}
    if len(data) < 12 {
        return false
    }
    return bytes.Equal(data[:12], signature)
}

API Endpoint

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

See the full API documentation for all endpoints and parameters.

Frequently Asked Questions

What is a .whl file?

A .whl file is a WHL file. zip file formatand formats based on it, such asEPUB,JAR,ODF,OOXML

What are the magic bytes for .whl files?

The magic bytes for WHL files are 50 4B 03 04 50 4B 05 06 50 4B 07 08 at byte offset 0. These bytes uniquely identify the file format regardless of the file extension.

How do I validate a .whl file?

To validate a .whl file, read the first bytes of the file and compare them against the known magic bytes (50 4B 03 04 50 4B 05 06 50 4B 07 08) at offset 0. This is more reliable than checking the file extension alone, as extensions can be renamed.

What is the MIME type for .whl files?

There is no officially registered MIME type for .whl files. Systems typically use application/octet-stream as a generic fallback when handling this format.

Is it safe to open .whl files?

WHL (.whl) 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.