BZ (.bz)
.bz file signature | application/x-bzip
BZ is a compressed archive file format associated with the bzip and bzip2 compression tools, originally created by Julian Seward and maintained through the bzip2 project. It is used to reduce file size for software distributions, backups, and data transfers, often as a single compressed data stream rather than a multi-file archive. The format is generally safe, though decompression can consume significant memory and time for very large or malformed files.
Magic Bytes
Offset 0
42 5A 30
Sources: Apache Tika
Extension
.bz
MIME Type
application/x-bzip
Byte Offset
0
Risk Level
Safe
Validation Code
How to validate .bz files in Python
def is_bz(file_path: str) -> bool:
"""Check if file is a valid BZ by magic bytes."""
signature = bytes([0x42, 0x5A, 0x30])
with open(file_path, "rb") as f:
return f.read(3) == signatureHow to validate .bz files in Node.js
function isBZ(buffer: Buffer): boolean {
const signature = Buffer.from([0x42, 0x5A, 0x30]);
return buffer.subarray(0, 3).equals(signature);
}How to validate .bz files in Go
func IsBZ(data []byte) bool {
signature := []byte{0x42, 0x5A, 0x30}
if len(data) < 3 {
return false
}
return bytes.Equal(data[:3], signature)
}API Endpoint
/api/v1/bz
curl https://filesignature.org/api/v1/bz
See the full API documentation for all endpoints and parameters.
Related Formats
Frequently Asked Questions
What is a .bz file?
A .bz file is identified by the magic bytes 42 5A 30 at byte offset 0. BZ is a compressed archive file format associated with the bzip and bzip2 compression tools, originally created by Julian Seward and maintained through the bzip2 project. It is used to reduce file size for software distributions, backups, and data transfers, often as a single compressed data stream rather than a multi-file archive. The format is generally safe, though decompression can consume significant memory and time for very large or malformed files.
What are the magic bytes for .bz files?
The magic bytes for BZ files are 42 5A 30 at byte offset 0. These bytes uniquely identify the file format regardless of the file extension.
How do I validate a .bz file?
To validate a .bz file, read the first bytes of the file and compare them against the known magic bytes (42 5A 30) at offset 0. This is more reliable than checking the file extension alone, as extensions can be renamed.
What is the MIME type for .bz files?
The primary MIME type for .bz files is application/x-bzip.
Is it safe to open .bz files?
BZ (.bz) 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.