Document
Plain Text is a document format commonly identified by .txt, .text. Use the listed signatures, MIME types, and structure notes to validate files beyond the extension.
74 69 74 6C 65 3A title:SIGNATURE = bytes.fromhex("7469746c653a")
OFFSET = 0
def is_txt(path: str) -> bool:
with open(path, "rb") as f:
f.seek(OFFSET)
head = f.read(len(SIGNATURE))
return head == SIGNATUREconst SIGNATURE = [0x74, 0x69, 0x74, 0x6c, 0x65, 0x3a];
const OFFSET = 0;
// bytes: a Uint8Array / Buffer holding the start of the file
export function isTxt(bytes) {
return SIGNATURE.every((byte, i) => bytes[OFFSET + i] === byte);
}package fileid
import "bytes"
var istxtSignature = []byte{0x74, 0x69, 0x74, 0x6c, 0x65, 0x3a}
const istxtOffset = 0
func IsTxt(b []byte) bool {
end := istxtOffset + len(istxtSignature)
if len(b) < end {
return false
}
return bytes.Equal(b[istxtOffset:end], istxtSignature)
}const SIGNATURE: &[u8] = &[0x74, 0x69, 0x74, 0x6c, 0x65, 0x3a];
const OFFSET: usize = 0;
fn is_txt(bytes: &[u8]) -> bool {
bytes.get(OFFSET..OFFSET + SIGNATURE.len()) == Some(SIGNATURE)
}<?php
$signature = "\x74\x69\x74\x6c\x65\x3a";
$offset = 0;
function is_txt(string $bytes): bool {
global $signature, $offset;
return substr($bytes, $offset, strlen($signature)) === $signature;
}Plain Text is used for data exchange, imports, exports, parser testing, and validation workflows. Encoding, delimiters, versions, and container structure often change implementation behavior.
Document formats may include scripts, attachments, macros, or external references. Sandbox previews and conversions, and avoid opening untrusted files directly.
11 samples help test leading-byte detection, parser errors, upload limits, and download behavior.
Blue Sky TXT is a Plain Text sample based on Wikimedia Commons. It can be used to test downloads, parsers, previews, and file type detection.
01-blue-sky.txtb4ef7c269237079163ffb2047223ccee7efdfe3317e9f2c941e8a9658ca7322dFlower Garden TXT is a Plain Text sample based on Wikimedia Commons. It can be used to test downloads, parsers, previews, and file type detection.
02-flower-garden.txt4f930a8a4a98e9f60dd45685492ed5f269bed5779df51de835f4800fc8070ff0Navy Blue Sky TXT is a Plain Text sample based on Wikimedia Commons. It can be used to test downloads, parsers, previews, and file type detection.
03-navy-blue-sky.txt56b479b44e4340cd4db9aa2772c1fbb48483217e0f9ed785a8d0cd2511f1d10bNature of the Sky TXT is a Plain Text sample based on Wikimedia Commons. It can be used to test downloads, parsers, previews, and file type detection.
04-nature-sky.txt13c9c17e777735a54d7ff404e6ef1c740d50cbbc073b26dfb6fa0a7eb5be8d12Sky Landscape TXT is a Plain Text sample based on Wikimedia Commons. It can be used to test downloads, parsers, previews, and file type detection.
05-sky-landscape.txt3d3498c21f5f508ea2581aba77104c0de05dba37d0f419efc5b3d4a4a0b5ec51Starry Sky TXT is a Plain Text sample based on Wikimedia Commons. It can be used to test downloads, parsers, previews, and file type detection.
06-starry-sky.txtd5ab2b30d3fc9dc2e0cdb6bb5e06de8e6741be30f3a6889cfe7900d6416c1c32Blue Night Sky TXT is a Plain Text sample based on Wikimedia Commons. It can be used to test downloads, parsers, previews, and file type detection.
07-blue-night-sky.txtd3a6fc8972af9b1cad31d5657ff4e8632c509e906316d226621ebce3d0b79e3bHibiscus Flower TXT is a Plain Text sample based on Wikimedia Commons. It can be used to test downloads, parsers, previews, and file type detection.
08-hibiscus-flower.txt48177ae9a99604b1c63b6bc18a020bfecf0b3b43955bb4fa444ac885817b36ffArctic Sky TXT is a Plain Text sample based on Wikimedia Commons. It can be used to test downloads, parsers, previews, and file type detection.
09-arctic-sky.txt467cb5ad3ddb4094ad1b73ec6afeff908cd0f01054318532ff6a7230dd689a62Sunset Rays TXT is a Plain Text sample based on Wikimedia Commons. It can be used to test downloads, parsers, previews, and file type detection.
10-sunset-rays.txt6b35d7b14f369167402135c26254c67f01d2c0cd3e154de7398d8b030aa0109aNASA Blue Marble TXT is a Plain Text 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.txt9a5f65a9e7e5c69a1b0c66721d65dcacc3376c326454dd931a4724a0be3c7f87Plain Text files begin with the byte signature 74 69 74 6C 65 3A ("title:"). Detect the format by reading these leading bytes rather than trusting the file extension alone.
The MIME type for Plain Text is text/plain.
Plain Text files use the .txt, .text extension. The extension is a convention only and does not guarantee the file contents, so combine it with signature and structure checks.