Android package (.apk)
.apk file signature | application/octet-stream
zip file formatand formats based on it, such asEPUB,JAR,ODF,OOXML
Magic Bytes
Offset 0
50 4B 03 04 50 4B 05 06 50 4B 07 08
Sources: Wikipedia
All Known Signatures
2 signature variants are documented for .apk files across multiple sources.
| Hex Signature | Offset | Sources |
|---|---|---|
| 50 4B 03 04 50 4B 05 06 50 4B 07 08 | 0 | Wikipedia |
| 50 4B 03 04 | 0 | Gary Kessler |
Extension
.apk
MIME Type
application/octet-stream
Byte Offset
0
Risk Level
Safe
Validation Code
How to validate .apk files in Python
def is_apk(file_path: str) -> bool:
"""Check if file is a valid APK 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) == signatureHow to validate .apk files in Node.js
function isAPK(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 .apk files in Go
func IsAPK(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
/api/v1/apk
curl https://filesignature.org/api/v1/apk
See the full API documentation for all endpoints and parameters.
Frequently Asked Questions
What is a .apk file?
A .apk file is a Android package file. zip file formatand formats based on it, such asEPUB,JAR,ODF,OOXML
What are the magic bytes for .apk files?
The magic bytes for Android package 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 .apk file?
To validate a .apk 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 .apk files?
There is no officially registered MIME type for .apk files. Systems typically use application/octet-stream as a generic fallback when handling this format.
Is it safe to open .apk files?
Android package (.apk) 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.