Java Code to Flowchart Converter

Paste a Java program, main method and all, and get a clean flowchart of its logic. The class and method boilerplate is left out; Scanner input becomes an input box, System.out.println an output box, and every if, switch and loop a proper decision with Yes / No branches.

  • Skips the boilerplate: class, main(), imports
  • Scanner input and System.out.println as input/output boxes
  • for, while and do-while loops with loop-back arrows
  • if / else if / else and switch as decisions
  • Animated dry run with a trace table for every variable
  • Export PNG, PDF, PowerPoint, SVG or Mermaid

How it works

  1. Paste your Java program and a sample input
  2. The AI draws the flowchart
  3. Press ▶ Explain to watch it run
  4. Export it for your record or slides

Try it with

  • Scanner sc = new Scanner(System.in); int num = sc.nextInt(); if (num % 2 == 0) System.out.println("even"); else System.out.println("odd");
  • int[] a = {3, 8, 12, 19, 25, 31, 40}; int key = 25, low = 0, high = a.length - 1, pos = -1; while (low <= high) { int mid = (low + high) / 2; if (a[mid] == key) { pos = mid; break; } else if (a[mid] < key) low = mid + 1; else high = mid - 1; } System.out.println(pos == -1 ? "Not found" : "Found at " + pos);
  • Scanner sc = new Scanner(System.in); int n = sc.nextInt(), sum = 0; while (n > 0) { sum += n % 10; n /= 10; } System.out.println("Sum of digits = " + sum);

Frequently asked questions

Is it free?

Yes. Drawing by hand is always free and every account includes free AI credits. AI Flowchart Pro adds unlimited AI generation and every diagram type.

Do I need to remove the class and main method first?

No. Paste the whole file; the flowchart shows only the program logic, starting at the first statement of main().

How is a switch statement drawn?

As a series of decisions, one per case (choice == 1?, choice == 2? …), each leading to its own steps, with default as the last No branch. That is how most courses expect a switch in a flowchart.

Does it run my Java code?

No. Nothing is compiled or executed; the AI reads the code and works out each step, the same way a dry run on paper works.

Can I export it?

Yes — PNG, SVG, PDF, PowerPoint with an editable slide, Mermaid code and draw.io. You can also share a live link or present it full screen.

Ready-made examples, explained

All diagram templates →

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