Structogram generator from code
Paste code — get a Nassi-Shneiderman structogram: nested boxes, not a single arrow. The same engine as for ISO 5807 flowcharts — just a different view of the algorithm. 10 languages, export to any format.
What a structogram is
A structogram (Nassi-Shneiderman diagram, NSD) shows an algorithm as nested boxes with no arrows. The whole logic reads top to bottom as a single block, so the structure is clear at a glance.
Sequence
Actions one after another — a stack of boxes top to bottom.
Branch
A condition is a triangle with “Yes” / “No”, with two columns below.
Loop
Repetition is a frame wrapping the loop body on the side and top.
Who it’s for
Structograms are often required at universities as an alternative to flowcharts: they are more compact, don’t tangle you in arrows, and show nesting directly. If your assignment asks for a structogram, rombik builds it in seconds.
How to make a structogram
Paste code
Python, JavaScript, TypeScript, C, C++, C#, Java, Go, PHP or Pascal — or drag a file in.
Flip the “Structogram” toggle
The same function instantly becomes a Nassi-Shneiderman structogram.
Save in the format you need
Word, Visio, draw.io, Typst, Excalidraw, SVG, PNG or PDF — as native objects, not a picture.
Any format
A structogram exports just as widely as a flowchart — as native objects of your chosen tool: Word (.docx), Visio (.vsdx), draw.io, Typst, Excalidraw, plus SVG, PNG and PDF.
Works across every language
The structogram is built by the same parser as flowcharts — the same for Python, JavaScript, TypeScript, C, C++, C#, Java, Go, PHP and Pascal. Nothing extra to configure.
Structogram FAQ
What is the difference between a structogram and a flowchart?
A flowchart (ISO 5807) uses shapes connected by arrows. A Nassi–Shneiderman diagram (NSD, structogram) uses nested boxes with no arrows — the same logic in a more compact form. rombik builds both from the same code: flip one toggle.
How do I generate a Nassi-Shneiderman diagram from Python code?
Paste your function into the editor and flip the “Structogram” toggle — done. The same structogram maker works for JavaScript, TypeScript, C, C++, C#, Java, Go, PHP and Pascal, and for pseudocode via the AI mode.
Can I export a structogram to Word?
Yes — the Word (.docx) export inserts the structogram as native editable shapes, right in your document. Visio, draw.io, Typst, Excalidraw, SVG, PNG and PDF are available too.
Is this structogram builder free?
Building and previewing structograms online is free. Clean exports to file formats use export credits (see Pricing).
Try a structogram right now
Paste code — and in seconds you’ll have a ready Nassi-Shneiderman structogram.
Open the editor