Free Code to Flowchart Converter

Transform any programming code into a clear, visual flowchart in seconds. Supports Python, JavaScript, Java, C++, and more.

0 / 20,000

A real function to a real flowchart

Function inputs, conditionals, and a loop — all converted.

Laptop screen showing Python source code with a process function and conditional logic on a dark editor theme

Input (JavaScript)

Generated flowchart visualizing the Python function as rectangles for steps and a diamond for the if/return branch

What the AI produces

The AI preserves the early-return ("return Invalid"), the continue inside the loop, and the loop's natural back-edge. These are exactly the structures that make code-to-flowchart converters tricky — and where most "tool A" converters produce broken diagrams.

What does code-to-flowchart actually do?

Paste a function in Python, JavaScript, TypeScript, Java, Go, C, C++, C#, or Rust, and Flowova maps the control flow — branches, loops, early returns, and switch/match — into a flowchart with decision diamonds and labeled paths. It traces one function at a time well; multi-function call graphs and whole-codebase visualization are not its target. Useful for explaining tricky logic in a PR description, walking a teammate through unfamiliar code, or generating teaching material from real source.

Written by Maya Chen

Transform Code into a Flowchart

1

Paste Your Code

Paste source code. Supported: JavaScript, TypeScript, Python, Java, C/C++, Go, Ruby, PHP, Rust, Swift, Kotlin, C#. The AI also handles pseudo-code that resembles code. Max 20,000 characters per generation.

  • Python, JS/TS, Java, Go, C/C++, C#, Rust, Ruby, PHP, Swift, Kotlin
  • One function per generation works best
  • Up to 20,000 characters per paste
2

AI Analyzes Logic Flow

Flowova parses the control flow: function entry, if/else branches, loops (for, while, do-while), switch/case, try/catch, early returns, recursive calls. Each control structure becomes a flowchart construct (decision diamonds, back-edges for loops).

  • if/else, for, while, do-while, switch, try/catch handled
  • Early returns become explicit terminal nodes
  • Recursion shown as a self-edge, not unrolled
3

Export Your Flowchart Free

The output diagram is editable — drag nodes, rename for clarity (e.g. replace cryptic variable names with English descriptions), and export. Common use: paste into code review docs or onboarding wikis to explain "what this function does."

  • Rename cryptic variables in node labels before sharing
  • Drop into PR descriptions or onboarding wikis
  • Free PNG; SVG and Mermaid are Pro

Code to Flowchart Features

Fan of language badges: Py, JS, TS, Go, Rs, Java

12 Programming Languages

Python, JavaScript, TypeScript, Java, Go, C, C++, C#, Rust, Ruby, PHP, Swift, Kotlin. The AI also handles pseudocode-ish syntax that resembles code.

Stacked control-flow shapes: diamond labelled if, loop circle labelled for, bracket labelled try

Control Flow Coverage

if/else/elif, for, while, do-while, switch/match, try/catch/finally, early returns, break, continue. Each maps to its standard flowchart construct.

Rectangle labelled fn() with a curved self-loop arrow representing recursion

Recursion as Self-Edge

Recursive calls render as a labeled self-edge back to the function entry, not unrolled — keeps the diagram readable for recursive algorithms.

Rectangle labelled notifyBackorder() with a faint dashed external dependency line

External Calls Preserved as Nodes

`notifyBackorder(item)` becomes a labeled rectangle. The diagram does not expand into that function unless you also paste it — by design, to keep one function per diagram.

Large hand-drawn diamond containing the code condition user.age >= 18

Verbatim Condition Labels

Decision diamonds carry the condition text as written in your code (`user.age >= 18 && user.verified`). Useful for fielding "what does this branch check?" in PRs.

Variable name tmp on left with curved arrow to a clearer label Validated Token on right

Rename for Sharing

Cryptic variable names (`u`, `tmp`, `flag`) can be renamed inline to readable labels before sharing with non-engineering reviewers.

When to use code-to-flowchart

Use this tool for

  • Code reviews: explain a non-trivial function visually instead of in 200 lines of comments.
  • Onboarding docs: show how a critical path works without forcing new engineers to read every line.
  • Refactoring planning: see the control-flow structure before deciding what to extract into helpers.
  • Teaching algorithms or preparing for interviews — paste a textbook function and get its diagram in seconds.

Use a different tool for

  • Whole-codebase architecture — this tool works at function scope. For project-wide call graphs use a dedicated viewer like SourceTrail or your IDE's call hierarchy.
  • Pseudocode you haven't implemented yet — Pseudocode-to-Flowchart's parser tolerates the informal syntax better.
  • Service-to-service interaction diagrams — Sequence Diagram Maker captures cross-service message order, which control flow inside one function won't.
  • Database schema reverse-engineering from migration files — paste the CREATE TABLE statements into the ER Diagram Generator.

Code to Flowchart FAQ

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