Free PlantUML to Flowchart Converter

Transform PlantUML code into interactive, editable flowcharts instantly. Paste your PlantUML activity or sequence diagrams - get visual diagrams you can customize and export.

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PlantUML activity diagram converted

Standard PlantUML syntax to visual editor.

Laptop screen showing a PlantUML code editor with @startuml syntax and Alice to Bob message lines

Input

Generated flowchart rendering the PlantUML activity diagram as clean visual shapes and arrows

What the AI produces

PlantUML's text syntax is fast to write but hard to share with non-engineers. Convert here once, then collaborate on the visual output.

What is PlantUML-to-flowchart conversion?

Paste PlantUML activity diagrams (`@startuml … @enduml` with `start/stop/if/while`) and Flowova renders them as editable diagrams. Sequence and class diagrams in PlantUML are not handled by this tool — use sequence-diagram-maker for sequences, and an ER-style tool for class-like structures. The intended path is: write PlantUML in your repo, then bring it here for visual edits or to export to PNG/SVG for slides without setting up a local Graphviz toolchain.

Written by Tomas Reyes

Convert PlantUML to an Editable Flowchart

1

Paste Your PlantUML Code

Paste PlantUML activity-diagram syntax (@startuml...@enduml). Supports start/stop, if/else, while loops, fork/join (parallel), partitions (lanes), and arrow labels.

  • `@startuml`/`@enduml` activity diagrams supported
  • `start`, `stop`, `if`, `while`, `repeat` recognized
  • Up to 20,000 characters per paste
2

Instant Visual Conversion

Flowova parses the PlantUML AST and renders it as a standard flowchart — same logic, prettier shapes, no PlantUML server dependency.

  • Layout is regenerated, not preserved from PlantUML
  • Class and sequence diagrams not handled here
  • No Graphviz setup needed — runs in your browser
3

Edit and Export

Edit visually, restyle, and export as PNG/SVG. Useful when your team has legacy PlantUML and wants to escape the text-based workflow.

  • Edit visually without re-rendering PlantUML
  • Free PNG; SVG and Mermaid are Pro
  • Theme for slides without leaving the editor

PlantUML to Flowchart Features

Hand-lettered PlantUML code block showing @startuml, start, action, stop, @enduml

Activity Diagram Syntax

`@startuml`...`@enduml` with `start`, `stop`, `if/then/else/endif`, `while/endwhile`, `repeat/repeat while`, `:action;`, and `note`.

Docker whale icon faintly crossed out beside a browser-window icon with a green check

No Local Graphviz Needed

PlantUML traditionally requires Graphviz installed locally for rendering. Flowova renders in your browser — no toolchain setup, no Docker image.

PlantUML code block on left and a clean pen-drawn flowchart of three rectangles on right

Layout Regenerated

The Flowova layout is generated by Dagre, not by PlantUML's native layout engine. Result is consistent with other Flowova diagrams visually.

Three file format tags in a fan: PNG, SVG, MMD

PNG / SVG / Mermaid Export

Export to PNG (free) for slides, SVG (Pro) for vector, or Mermaid (Pro) for cross-tool compatibility — convert your PlantUML to a portable format.

Three diagram-type icons in a row — class, component, deployment — each crossed out

Other Diagram Types Excluded

Only the `@startuml ... @enduml` activity-diagram subset is parsed. Class, component, deployment, and sequence diagram blocks fall outside this converter's scope and return a clear error rather than attempting a degraded conversion that loses the original semantics.

Engineer figure holding PlantUML code on left and product manager looking at slide on right

Useful for Stakeholder Slides

Engineers write PlantUML for their repos; product/business reviews benefit from visual edits and slide-ready PNG. This bridges the two contexts.

When to use plantuml-to-flowchart

Use this tool for

  • You wrote a PlantUML activity diagram in your docs repo and your PM or designer wants to edit it without learning the syntax.
  • Producing slide-ready or print-ready PNG and SVG of a PlantUML diagram without standing up a local PlantUML server.
  • Migrating a wiki full of legacy PlantUML diagrams into a visual editor everyone on the team can use.
  • Sharing a PlantUML diagram externally where the audience can't run Graphviz to render it.

Use a different tool for

  • PlantUML sequence diagrams — this tool only parses the activity-diagram subset. Describe the message flow in plain English to Sequence Diagram Maker, or use plantuml.com's own renderer.
  • PlantUML class diagrams or component diagrams — those have a different visual model; PlantUML.com or a UML editor like StarUML is the right home.
  • PlantUML state diagrams — describe the states and transitions to State Diagram Maker, or render in plantuml.com.
  • You're authoring brand-new diagrams without an existing .puml source — Text-to-Flowchart accepts plain English and skips the PlantUML round-trip.

PlantUML to Flowchart FAQ

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