.VSDX Microsoft Visio Drawing
.vsdx

Microsoft Visio Drawing

VSDX is a ZIP archive you can rename to .zip and extract — inside are XML files defining every shape's geometry, connector routing, and data links. No Visio needed to inspect the structure. Free alternatives: draw.io and Lucidchart.

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File structure
Header schema
Records structured data
PagesVectorECMA-3762013
By FileDex
Not convertible

VSDX requires specialized diagramming software for conversion. FileDex displays format information and CLI conversion commands.

Looking to convert? Try a related format:

Try .PDF Try .SVG

Common questions

What is a VSDX file and how is it different from VSD?

VSDX is Microsoft Visio's modern diagram format, introduced in Visio 2013. It stores shapes, connectors, and data links as XML inside a ZIP archive (OPC container). VSD is the older binary format that requires specialized libraries to read. VSDX can be renamed to .zip and extracted with any archive tool.

How do I open a VSDX file without Microsoft Visio?

draw.io (free, web and desktop) and Lucidchart both import VSDX files with good fidelity. LibreOffice Draw provides partial support. Visio Online (Microsoft 365) works in any browser. You can also rename .vsdx to .zip and read the XML parts in any text editor.

Can I convert VSDX to PDF or SVG?

Export from within Visio via File > Save As > PDF or SVG. draw.io imports VSDX and exports to PDF, SVG, and PNG. Lucidchart offers similar export options. There is no command-line tool that reliably converts VSDX without a rendering engine — the shape geometry and connector routing require Visio-compatible logic.

Why is my VSDX file so large?

Embedded images (logos, screenshots pasted onto diagrams) dominate VSDX file size. Visio embeds images at full resolution inside the ZIP archive. Remove unused images, crop oversized screenshots before inserting, or use linked images instead of embedded ones to reduce file size.

What makes .VSDX special

ZIP inside
Rename to .zip and explore the XML
VSDX uses Open Packaging Conventions — the same ZIP/XML container as DOCX and XLSX. Rename the extension, extract, and read every shape definition in plain text.
Replaced VSD in 2013
Opaque binary → inspectable XML
Pre-2013 binary VSD files need specialized libraries. VSDX made diagram data transparent — each shape's geometry, text, and connections are readable XML.
draw.io is free
Full VSDX import without Visio license
draw.io (diagrams.net) imports VSDX files with high fidelity and runs in the browser. No Microsoft 365 subscription needed. Lucidchart also supports VSDX import.
Live data dashboards
Shapes bound to SQL, Excel, SharePoint
Visio data linking binds shapes to external datasets. Data graphics render values as icons, bars, or conditional colors — turning static diagrams into live dashboards.

Every VSDX file is a ZIP archive following Microsoft's Open Packaging Conventions (OPC) — the same container format used by DOCX, XLSX, and PPTX. Rename any .vsdx to .zip, extract it, and you can read every shape definition, connector route, and data link in plain XML.

Continue reading — full technical deep dive

OPC Container Structure

The root contains [Content_Types].xml declaring MIME types for all parts. The _rels directory holds relationship files linking parts together. The visio directory contains the actual diagram data: document.xml for global properties, pages/pages.xml for the page index, and pages/page1.xml through pageN.xml for individual page content. Masters (reusable shapes from stencils) live in visio/masters/.

Shape Geometry in XML

Each shape on a Visio page maps to a <Shape> element in the page XML. The geometry is defined by <Section N="Geometry"> containing rows of drawing operations: MoveTo sets the starting point, LineTo draws straight segments, ArcTo draws circular arcs, NURBSTo draws freeform curves, and EllipticalArcTo draws ellipses. Coordinates default to inches with the origin at the bottom-left of the page.

Text inside shapes appears in <Section N="Character"> and <Text> elements with formatting properties (font, size, color, alignment) separate from the geometry.

Connector Routing

Visio connectors are shapes with <Section N="Connection"> referencing source and target shape IDs. When connected shapes move, the connector recalculates its path using dynamic routing algorithms. The routing avoids overlapping shapes and minimizes crossings. This dynamic behavior is what makes VSDX files more than static drawings.

Data Linking

Visio's data linking feature binds shapes to rows in external datasets — Excel files, SQL Server tables, SharePoint lists, or OLEDB/ODBC sources. The binding is stored in <DataRecordSets> within the VSDX. Data graphics render values as callout text, icon sets, data bars, or conditional color fills directly on shapes. This enables live dashboards — a network diagram where router shapes turn red when link utilization exceeds 80%.

VSD vs VSDX

Pre-2013 binary VSD files use OLE2 Compound Document format (like .doc and .xls). VSD is opaque — you need a Visio-compatible library to read it. VSDX replaced this with inspectable XML. Conversion is one-way: Visio opens VSD and saves as VSDX, but there is no automated tool for the reverse. Organizations migrating from VSD to VSDX should batch-convert using Visio's built-in Save As.

Security Considerations

VSDX files can contain VBA macros (stored in a separate vbaProject.bin part within the OPC container). Macro-enabled Visio files use the .vsdm extension. Like Word macros, Visio macros can execute arbitrary code. Modern Visio versions block macros from the internet by default (Mark of the Web protection). Enterprise environments should enforce macro policies via Group Policy.

.VSDX compared to alternatives

.VSDX vs .PDF
Editability
VSDX preserves shape geometry, connector routing, layers, and data links — fully editable in Visio or draw.io. PDF flattens the diagram into fixed paths with no semantic shape information.
 VSDX wins
.VSDX vs .SVG
Web embedding
SVG renders natively in every browser and can be styled with CSS and scripted with JavaScript. VSDX requires a Visio-compatible application to render — no browser displays it natively.
 SVG wins
.VSDX vs .DRAW.IO XML
Vendor lock-in
draw.io XML is open-source and vendor-neutral. VSDX is fully documented (MS-VSDX spec) but the rendering engine is proprietary — only Microsoft Visio renders all features correctly.
 DRAW.IO XML wins

Technical reference

MIME Type
application/vnd.ms-visio.drawing
Magic Bytes
50 4B 03 04 ZIP/OPC container signature — same as DOCX, XLSX, PPTX. Differentiated by [Content_Types].xml inside the archive.
Developer
Microsoft
Year Introduced
2013
Open Standard
No — View specification
00000000504B0304 PK..

ZIP/OPC container signature — same as DOCX, XLSX, PPTX. Differentiated by [Content_Types].xml inside the archive.

Binary Structure

VSDX is a ZIP archive following OPC. The first 4 bytes are the ZIP local file header signature (50 4B 03 04). Inside, [Content_Types].xml declares part types. The visio/ directory tree contains XML definitions for document properties, pages with shape geometry, and masters (stencils). Each shape is XML with geometry sections (MoveTo, LineTo, ArcTo), text sections, and connection references. docProps/ holds Dublin Core metadata.

2003Microsoft introduces Visio 2003 with VSD binary format as the standard drawing format2013Visio 2013 adopts VSDX as default — XML-based Open Packaging Convention replaces VSD binary2015Visio Online (later Visio for the web) launches with VSDX as the only supported format2021Microsoft integrates Visio diagramming directly into Microsoft 365 web apps
List all parts inside a VSDX file other 
unzip -l diagram.vsdx

Lists all OPC parts and their sizes. VSDX is a standard ZIP archive — any unzip tool works. Look for visio/pages/page1.xml to find the main diagram content.

Extract and inspect shape XML from a VSDX page other 
unzip -p diagram.vsdx visio/pages/page1.xml | xmllint --format -

Extracts page1.xml to stdout and pretty-prints the XML. Each <Shape> element contains geometry, text, and connection data.

Identify a VSDX file by content other 
file diagram.vsdx

Reports 'Microsoft OOXML' or 'Zip archive data'. The file command recognizes VSDX as a ZIP/OPC container but may not distinguish it from DOCX without deeper inspection.

MEDIUM

Attack Vectors

  • VBA macro execution in .vsdm files
  • ZIP bomb via nested OPC parts

Mitigation: FileDex does not process VSDX files. For safe handling: disable macros in Visio preferences, open untrusted files in Protected View, use draw.io for viewing without macro risk.