VSDX (.vsdx)
.vsdx file signature | application/vnd.ms-visio.drawing
Visio Drawing (.vsdx) is a diagram file format created and maintained by Microsoft as part of the Office Open XML family. It is used for flowcharts, network diagrams, organization charts, floor plans, and other technical drawings in Microsoft Visio and compatible applications. The format is generally safe, but because it is a compressed package that can contain linked content and embedded resources, files from untrusted sources should still be opened with caution.
Magic Bytes
Offset 0
50 4B 03 04
Sources: Wikipedia
All Known Signatures
3 signature variants are documented for .vsdx files across multiple sources.
Extension
.vsdx
MIME Type
application/vnd.ms-visio.drawing
Byte Offset
0
Risk Level
Safe
Validation Code
How to validate .vsdx files in Python
def is_vsdx(file_path: str) -> bool:
"""Check if file is a valid VSDX by magic bytes."""
signature = bytes([0x50, 0x4B, 0x03, 0x04])
with open(file_path, "rb") as f:
return f.read(4) == signatureHow to validate .vsdx files in Node.js
function isVSDX(buffer: Buffer): boolean {
const signature = Buffer.from([0x50, 0x4B, 0x03, 0x04]);
return buffer.subarray(0, 4).equals(signature);
}How to validate .vsdx files in Go
func IsVSDX(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/vsdx
curl https://filesignature.org/api/v1/vsdx
See the full API documentation for all endpoints and parameters.
Related Formats
Frequently Asked Questions
What is a .vsdx file?
A .vsdx file is identified by the magic bytes 50 4B 03 04 at byte offset 0. Visio Drawing (.vsdx) is a diagram file format created and maintained by Microsoft as part of the Office Open XML family. It is used for flowcharts, network diagrams, organization charts, floor plans, and other technical drawings in Microsoft Visio and compatible applications. The format is generally safe, but because it is a compressed package that can contain linked content and embedded resources, files from untrusted sources should still be opened with caution.
What are the magic bytes for .vsdx files?
The magic bytes for VSDX 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 .vsdx file?
To validate a .vsdx 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 .vsdx files?
The primary MIME type for .vsdx files is application/vnd.ms-visio.drawing.
Is it safe to open .vsdx files?
VSDX (.vsdx) 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.