Document
PowerPoint Open XML Presentation is a document format commonly identified by .pptx. Use the listed signatures, MIME types, and structure notes to validate files beyond the extension.
50 4B 03 04 PK..SIGNATURE = bytes.fromhex("504b0304")
OFFSET = 0
def is_pptx(path: str) -> bool:
with open(path, "rb") as f:
f.seek(OFFSET)
head = f.read(len(SIGNATURE))
return head == SIGNATUREconst SIGNATURE = [0x50, 0x4b, 0x03, 0x04];
const OFFSET = 0;
// bytes: a Uint8Array / Buffer holding the start of the file
export function isPptx(bytes) {
return SIGNATURE.every((byte, i) => bytes[OFFSET + i] === byte);
}package fileid
import "bytes"
var ispptxSignature = []byte{0x50, 0x4b, 0x03, 0x04}
const ispptxOffset = 0
func IsPptx(b []byte) bool {
end := ispptxOffset + len(ispptxSignature)
if len(b) < end {
return false
}
return bytes.Equal(b[ispptxOffset:end], ispptxSignature)
}const SIGNATURE: &[u8] = &[0x50, 0x4b, 0x03, 0x04];
const OFFSET: usize = 0;
fn is_pptx(bytes: &[u8]) -> bool {
bytes.get(OFFSET..OFFSET + SIGNATURE.len()) == Some(SIGNATURE)
}<?php
$signature = "\x50\x4b\x03\x04";
$offset = 0;
function is_pptx(string $bytes): bool {
global $signature, $offset;
return substr($bytes, $offset, strlen($signature)) === $signature;
}PowerPoint Open XML Presentation 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 PPTX is a PowerPoint Open XML Presentation sample based on Wikimedia Commons. It can be used to test downloads, parsers, previews, and file type detection.
01-blue-sky.pptx0ebca31a33f9e21bf2828a3684585d6151ee8233907e71b5807a11f722eb937cFlower Garden PPTX is a PowerPoint Open XML Presentation sample based on Wikimedia Commons. It can be used to test downloads, parsers, previews, and file type detection.
02-flower-garden.pptxdde44497df2e3cb6d81f43ae93a92609a40a5dc30a6d4babc57310b6422c6d01Navy Blue Sky PPTX is a PowerPoint Open XML Presentation sample based on Wikimedia Commons. It can be used to test downloads, parsers, previews, and file type detection.
03-navy-blue-sky.pptxc333b669a69179a03ab19b9b8fa268bc4efb20ef11a9afb42ef85f40dc1c9174Nature of the Sky PPTX is a PowerPoint Open XML Presentation sample based on Wikimedia Commons. It can be used to test downloads, parsers, previews, and file type detection.
04-nature-sky.pptxf8a9a6af35f983c505ba43d2fc40ffb2fb185c561b595ceee96c43ad442ee2b1Sky Landscape PPTX is a PowerPoint Open XML Presentation sample based on Wikimedia Commons. It can be used to test downloads, parsers, previews, and file type detection.
05-sky-landscape.pptxb84c80e20dee2314d7de406bd4784ad7357c4e54d7acf74a89281ce2d840f9e0Starry Sky PPTX is a PowerPoint Open XML Presentation sample based on Wikimedia Commons. It can be used to test downloads, parsers, previews, and file type detection.
06-starry-sky.pptxdc2e6c74968a0529575ac5b54c5d2b86d0682d85a97e2b0389ce605cf2bbf940Blue Night Sky PPTX is a PowerPoint Open XML Presentation sample based on Wikimedia Commons. It can be used to test downloads, parsers, previews, and file type detection.
07-blue-night-sky.pptx23590cf9727e1f04cdfbada35d448b8e9ec193bc48326649dd2931eaba7a6ab3Hibiscus Flower PPTX is a PowerPoint Open XML Presentation sample based on Wikimedia Commons. It can be used to test downloads, parsers, previews, and file type detection.
08-hibiscus-flower.pptx85d6732102fa9673ff5aa3f10eebf3f6392c9accb0e0fc5a0c2088816b4173c8Arctic Sky PPTX is a PowerPoint Open XML Presentation sample based on Wikimedia Commons. It can be used to test downloads, parsers, previews, and file type detection.
09-arctic-sky.pptx8fae1e64034354a5555a73fa059aea9477e0dd7043f4a0866cdbf3d29570c472Sunset Rays PPTX is a PowerPoint Open XML Presentation sample based on Wikimedia Commons. It can be used to test downloads, parsers, previews, and file type detection.
10-sunset-rays.pptxcb92c209dea74dc729d59367e183c9b335d1236ec4b91c690c7e18a3a1197858NASA Blue Marble PPTX is a PowerPoint Open XML Presentation 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.pptxd8c370f937422ed297e372778f13b997701334cd2bc481a59034a1cf3bd36bf3PowerPoint Open XML Presentation files begin with the byte signature 50 4B 03 04 ("PK.."). Detect the format by reading these leading bytes rather than trusting the file extension alone.
The MIME type for PowerPoint Open XML Presentation is application/vnd.openxmlformats-officedocument.presentationml.presentation.
PowerPoint Open XML Presentation files use the .pptx extension. The extension is a convention only and does not guarantee the file contents, so combine it with signature and structure checks.