Microsoft Office Open XML Format (.pptx)
.pptx file signature | application/vnd.openxmlformats-officedocument.presentationml.presentation
Microsoft Office Open XML Presentation (PPTX) is a presentation file format introduced by Microsoft and standardized through Ecma International and ISO/IEC as part of Office Open XML. It is used for slide decks in Microsoft PowerPoint and compatible applications, supporting text, images, charts, multimedia, and layout data. PPTX files are ZIP-based containers and may include embedded content or macros in related formats, so files from untrusted sources should be opened with caution.
Magic Bytes
Offset 0
50 4B 03 04
Sources: Wikipedia
All Known Signatures
4 signature variants are documented for .pptx files across multiple sources.
| Hex Signature | Offset | Sources |
|---|---|---|
| 50 4B 03 04 | 0 | Wikipedia |
| 50 4B 05 06 | 0 | Wikipedia |
| 50 4B 07 08 | 0 | Wikipedia |
| 50 4B 03 04 14 00 06 00 | 0 | Gary Kessler |
Extension
.pptx
MIME Type
application/vnd.openxmlformats-officedocument.presentationml.presentation
Byte Offset
0
Risk Level
Safe
Validation Code
How to validate .pptx files in Python
def is_pptx(file_path: str) -> bool:
"""Check if file is a valid PPTX by magic bytes."""
signature = bytes([0x50, 0x4B, 0x03, 0x04])
with open(file_path, "rb") as f:
return f.read(4) == signatureHow to validate .pptx files in Node.js
function isPPTX(buffer: Buffer): boolean {
const signature = Buffer.from([0x50, 0x4B, 0x03, 0x04]);
return buffer.subarray(0, 4).equals(signature);
}How to validate .pptx files in Go
func IsPPTX(data []byte) bool {
signature := []byte{0x50, 0x4B, 0x03, 0x04}
if len(data) < 4 {
return false
}
return bytes.Equal(data[:4], signature)
}API Endpoint
/api/v1/pptx
curl https://filesignature.org/api/v1/pptx
See the full API documentation for all endpoints and parameters.
Related Formats
Frequently Asked Questions
What is a .pptx file?
A .pptx file is a Microsoft Office Open XML Format file. Microsoft Office Open XML Presentation (PPTX) is a presentation file format introduced by Microsoft and standardized through Ecma International and ISO/IEC as part of Office Open XML. It is used for slide decks in Microsoft PowerPoint and compatible applications, supporting text, images, charts, multimedia, and layout data. PPTX files are ZIP-based containers and may include embedded content or macros in related formats, so files from untrusted sources should be opened with caution.
What are the magic bytes for .pptx files?
The magic bytes for Microsoft Office Open XML Format files are 50 4B 03 04 at byte offset 0. These bytes uniquely identify the file format regardless of the file extension.
How do I validate a .pptx file?
To validate a .pptx file, read the first bytes of the file and compare them against the known magic bytes (50 4B 03 04) at offset 0. This is more reliable than checking the file extension alone, as extensions can be renamed.
What is the MIME type for .pptx files?
The primary MIME type for .pptx files is application/vnd.openxmlformats-officedocument.presentationml.presentation.
Is it safe to open .pptx files?
Microsoft Office Open XML Format (.pptx) 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.