Is rediagram a Visio replacement?

Not a drop-in one. There is no canvas to drag shapes around on. It writes diagrams from a description and converts the ones you already have, both onto your brand. For hand-drawing, pick a tool from the list above.

Can it just write the diagram for me?

Yes. Describe the system in plain language — the parts, what talks to what, where the boundaries are — and it produces the diagram on your brand. It generates the structure only; layout and styling stay deterministic, so an authored diagram is laid out by the same code as a converted one and the two match.

Can I open a .vsdx without a Visio licence?

Yes. The free converter on this site reads .vsdx in the browser with no sign-up, and draw.io opens them too.

What about the older .vsd format?

Not supported. .vsd is a binary format from Visio 2010 and earlier. Open it in Visio or draw.io once and save as .vsdx.

Will my diagrams look the same afterwards?

Deliberately not. They keep their content — the shapes, the connections, the grouping — and lose the source styling, because matching your brand is the point. Every conversion reports exactly what changed.

Leaving Visio

Visio alternatives, and the file problem nobody mentions

Every list of Visio alternatives tells you what to draw with next. None of them tell you what happens to the hundreds of .vsdx files you already have. That is the part we handle — so this page covers both.

Straight answer first: rediagram is not a drop-in Visio replacement. There is no canvas and no dragging boxes around. It does two things: it writes a diagram from a description, and it converts diagrams you already have — both onto your brand. If you want to draw by hand, pick one of the tools below and use this for everything else.

What Visio is genuinely good at

Visio is still the most complete stencil library in the industry, it is the format most enterprise architecture is already stored in, and its Windows desktop app handles very large drawings better than most browser tools. If your organisation runs on Visio stencils and templates, switching costs more than the licence saves. These pages are for teams who have already decided to move.

Where to draw instead

Tool	Best for	Why
draw.io (diagrams.net)	Most people leaving Visio	Free and open source, runs in the browser or as a desktop app, needs no account, and reads .vsdx directly. The closest thing to a drop-in replacement.
Lucidchart	Teams that need real-time collaboration	Web-first with strong multi-user editing and enterprise administration. Imports Visio files and exports back to .vsdx.
Excalidraw	Sketching and whiteboarding	Free, open source, deliberately informal. Excellent for thinking out loud, not intended as a system-of-record for architecture.
Mermaid	Diagrams that live in the repository	Text-based, so diagrams version and review like code. Renders natively in GitHub and GitLab. No canvas to drag things around on.

The part the other lists skip

This reads real Visio files — shapes, connections, groups and masters. It redraws them rather than tracing them: source coordinates, fills and fonts are discarded, which is what stops a converted diagram from looking converted. And when there is no file to bring, you can describe the diagram instead and it will write it — same layout engine, same brand, so the two are indistinguishable.

Questions people actually ask

Is rediagram a Visio replacement?: Not a drop-in one. There is no canvas to drag shapes around on. It writes diagrams from a description and converts the ones you already have, both onto your brand. For hand-drawing, pick a tool from the list above.
Can it just write the diagram for me?: Yes. Describe the system in plain language — the parts, what talks to what, where the boundaries are — and it produces the diagram on your brand. It generates the structure only; layout and styling stay deterministic, so an authored diagram is laid out by the same code as a converted one and the two match.
Can I open a .vsdx without a Visio licence?: Yes. The free converter on this site reads .vsdx in the browser with no sign-up, and draw.io opens them too.
What about the older .vsd format?: Not supported. .vsd is a binary format from Visio 2010 and earlier. Open it in Visio or draw.io once and save as .vsdx.
Will my diagrams look the same afterwards?: Deliberately not. They keep their content — the shapes, the connections, the grouping — and lose the source styling, because matching your brand is the point. Every conversion reports exactly what changed.

Leaving something else?

Lucidchart · draw.io · Miro