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LZFSE (.lzfse)

.lzfse file signature | application/octet-stream

LZFSE - Lempel-Ziv style data compression algorithm using Finite State Entropy coding. OSS by Apple.[72]

Safe

Magic Bytes

Offset 0
62 76 78 32

Sources: Wikipedia

Extension

.lzfse

MIME Type

application/octet-stream

Byte Offset

0

Risk Level

Safe

Validation Code

How to validate .lzfse files in Python

Python 
def is_lzfse(file_path: str) -> bool:
    """Check if file is a valid LZFSE by magic bytes."""
    signature = bytes([0x62, 0x76, 0x78, 0x32])
    with open(file_path, "rb") as f:
        return f.read(4) == signature

How to validate .lzfse files in Node.js

Node.js 
function isLZFSE(buffer: Buffer): boolean {
  const signature = Buffer.from([0x62, 0x76, 0x78, 0x32]);
  return buffer.subarray(0, 4).equals(signature);
}

How to validate .lzfse files in Go

Go 
func IsLZFSE(data []byte) bool {
    signature := []byte{0x62, 0x76, 0x78, 0x32}
    if len(data) < 4 {
        return false
    }
    return bytes.Equal(data[:4], signature)
}

API Endpoint

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

See the full API documentation for all endpoints and parameters.

Frequently Asked Questions

What is a .lzfse file?

A .lzfse file is a LZFSE file. LZFSE - Lempel-Ziv style data compression algorithm using Finite State Entropy coding. OSS by Apple.[72]

What are the magic bytes for .lzfse files?

The magic bytes for LZFSE files are 62 76 78 32 at byte offset 0. These bytes uniquely identify the file format regardless of the file extension.

How do I validate a .lzfse file?

To validate a .lzfse file, read the first bytes of the file and compare them against the known magic bytes (62 76 78 32) at offset 0. This is more reliable than checking the file extension alone, as extensions can be renamed.

What is the MIME type for .lzfse files?

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

Is it safe to open .lzfse files?

LZFSE (.lzfse) 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.