Data
Log File is a data format commonly identified by .log. Use the listed signatures, MIME types, and structure notes to validate files beyond the extension.
32 30 32 36 2D 2026-SIGNATURE = bytes.fromhex("323032362d")
OFFSET = 0
def is_log(path: str) -> bool:
with open(path, "rb") as f:
f.seek(OFFSET)
head = f.read(len(SIGNATURE))
return head == SIGNATUREconst SIGNATURE = [0x32, 0x30, 0x32, 0x36, 0x2d];
const OFFSET = 0;
// bytes: a Uint8Array / Buffer holding the start of the file
export function isLog(bytes) {
return SIGNATURE.every((byte, i) => bytes[OFFSET + i] === byte);
}package fileid
import "bytes"
var islogSignature = []byte{0x32, 0x30, 0x32, 0x36, 0x2d}
const islogOffset = 0
func IsLog(b []byte) bool {
end := islogOffset + len(islogSignature)
if len(b) < end {
return false
}
return bytes.Equal(b[islogOffset:end], islogSignature)
}const SIGNATURE: &[u8] = &[0x32, 0x30, 0x32, 0x36, 0x2d];
const OFFSET: usize = 0;
fn is_log(bytes: &[u8]) -> bool {
bytes.get(OFFSET..OFFSET + SIGNATURE.len()) == Some(SIGNATURE)
}<?php
$signature = "\x32\x30\x32\x36\x2d";
$offset = 0;
function is_log(string $bytes): bool {
global $signature, $offset;
return substr($bytes, $offset, strlen($signature)) === $signature;
}Log File is used for data exchange, imports, exports, parser testing, and validation workflows. Encoding, delimiters, versions, and container structure often change implementation behavior.
Untrusted input is not safe just because the format was detected. Account for parser exceptions, large files, unexpected encodings, and external references.
11 samples help test leading-byte detection, parser errors, upload limits, and download behavior.
Blue Sky LOG is a Log File sample based on Wikimedia Commons. It can be used to test downloads, parsers, previews, and file type detection.
01-blue-sky.log981d51a3269c3b7eecc126dc91cafbf5c6ec75c9dd4ae2a550946c8324f3d9acFlower Garden LOG is a Log File sample based on Wikimedia Commons. It can be used to test downloads, parsers, previews, and file type detection.
02-flower-garden.log6a81a7f923919c8240626c0710455508fc2460e18c9a549d5539f38796eab3f8Navy Blue Sky LOG is a Log File sample based on Wikimedia Commons. It can be used to test downloads, parsers, previews, and file type detection.
03-navy-blue-sky.log5317ae9ea98d825c7c92aeed7e8aeb597408fc7b97c506a58592f681216cef46Nature of the Sky LOG is a Log File sample based on Wikimedia Commons. It can be used to test downloads, parsers, previews, and file type detection.
04-nature-sky.loga3f7e620081be4fca79a3617393a9cb6dcc70cf2730d38be3ad4ff57673e9b23Sky Landscape LOG is a Log File sample based on Wikimedia Commons. It can be used to test downloads, parsers, previews, and file type detection.
05-sky-landscape.log476b956e6276ab49c2e95d1a2dc9a96eb8183ad94512b947cedef2d4a83aaed9Starry Sky LOG is a Log File sample based on Wikimedia Commons. It can be used to test downloads, parsers, previews, and file type detection.
06-starry-sky.log1c0aa7176033ae184031a522569a845f3172cc5e40440d5068e5d035425c5cd4Blue Night Sky LOG is a Log File sample based on Wikimedia Commons. It can be used to test downloads, parsers, previews, and file type detection.
07-blue-night-sky.log3127d5c1d54cf058860639d939114b24723496e4664f32d049571575626de3c3Hibiscus Flower LOG is a Log File sample based on Wikimedia Commons. It can be used to test downloads, parsers, previews, and file type detection.
08-hibiscus-flower.logd6365998f74a2bb0141106ab8dc1433ece30013ba42fbcf118468fe671203380Arctic Sky LOG is a Log File sample based on Wikimedia Commons. It can be used to test downloads, parsers, previews, and file type detection.
09-arctic-sky.log3562c18f5a5944750c85a708d5a057a84dbba7e760ae8742df482be2ad89a117Sunset Rays LOG is a Log File sample based on Wikimedia Commons. It can be used to test downloads, parsers, previews, and file type detection.
10-sunset-rays.log25471eafd854d7fba17b9b89f6ffe92119505657dbee7cc78a331706e3f92a44NASA Blue Marble LOG is a Log File sample based on NASA Image and Video Library. It can be used to test downloads, parsers, previews, and file type detection.
nasa-blue-marble-2012-east.log750093230bfb21458ee8db92863dab9485f2bc97f83214dd5c00a2b8b52c22e0Log File files begin with the byte signature 32 30 32 36 2D ("2026-"). Detect the format by reading these leading bytes rather than trusting the file extension alone.
The MIME type for Log File is text/plain.
Log File files use the .log extension. The extension is a convention only and does not guarantee the file contents, so combine it with signature and structure checks.