fsm online tool

Design, simulate, and visualize Finite State Machines (FSM/DFA) with an intuitive online interface.

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About This Tool

This FSM Online Tool allows you to create, simulate, and visualize deterministic finite automata (DFA). Define your states, alphabet symbols, transition rules, start state, and accept states. The tool validates your FSM definition, simulates input strings, and generates an interactive state diagram visualization. Perfect for students, educators, and developers working with automata theory, compiler design, or state-based systems.

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How to Use

Enter states as comma-separated values (e.g., q0,q1,q
Define alphabet symbols (e.g., 0,
Add transition rules in format 'state,symbol,next_state' (one per line)
Specify start state and accept states
Click 'Validate & Visualize FSM' to check your machine
Enter input strings to simulate acceptance/rejection
View results and interactive state diagram

Frequently Asked Questions

Find Quick Answers

What is a Finite State Machine (FSM)?

A Finite State Machine is a mathematical model of computation consisting of a finite number of states, transitions between those states, and an input alphabet. It's used to design algorithms, digital circuits, and lexical analyzers.

What input format should I use for transitions?

Enter one transition per line in the format: current_state,symbol,next_state. For example: 'q0,0,q1' means from state q0 on symbol 0, go to state q1.

Can I simulate multiple input strings?

Yes! Enter multiple test strings separated by commas or newlines. The tool will process each one and show acceptance results for all strings.

Does this tool support non-deterministic FSMs (NFA)?

No, this tool currently only supports deterministic finite automata (DFA) where each state-symbol pair has exactly one transition.

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