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Stack Visualizer — Push & Pop (LIFO)

Interactive LIFO stack — push and pop with an animated top pointer and step controls. Runs in your browser.

Free No signup Client-side Privacy friendly Updated

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Pseudocode

Run an operation to see its steps.

How to use

  1. 1 Type a number and press Push to add it to the top of the stack.
  2. 2 Press Pop to remove the top element (last in, first out).
  3. 3 Use Random to push a random value, or Clear to empty the stack.
  4. 4 Step back and forward through any operation.

Why use this tool

  • See the LIFO rule: the last value pushed is the first one popped.
  • Watch the "top" pointer move as you push and pop.
  • Understand why push and pop are both O(1).
  • Runs entirely in your browser. No signup, no uploads.

Frequently asked questions

What is a stack?

A stack is a LIFO (last-in, first-out) collection: elements are added (pushed) and removed (popped) only from the same end, called the top.

What is the time complexity of stack operations?

Push, pop, and peek are all O(1) — they only touch the top element.

What are stacks used for?

Function call frames, undo/redo, expression evaluation, backtracking, and depth-first search.

How is a stack different from a queue?

A stack is LIFO (add and remove at the same end); a queue is FIFO (add at the rear, remove from the front).

What is Stack Visualizer?

A Stack Visualizer animates a stack — a last-in, first-out (LIFO) collection where values are pushed onto and popped off the same end, called the top. Push and pop are both O(1).

Features

Push / pop / peek

Animate each operation on the top of the stack.

Complexity

push / pop / peek: O(1) each. Space: O(n). LIFO order.

100% private

Runs entirely in your browser — nothing is uploaded.

Example

Input

push A, push B, push C, then pop

Output

pop → C (LIFO: last in, first out)

Common use cases

  1. 1

    Understand LIFO

    See why the last element pushed is the first popped.

  2. 2

    Call stacks & undo

    Relate the structure to function call stacks and undo history.

  3. 3

    Expression evaluation

    Learn how stacks evaluate and balance parentheses.

Summary

Zerethon's stack visualizer animates a LIFO (last-in, first-out) stack in your browser, showing push, pop, and peek. Every stack operation runs in O(1) time; space is O(n) for n elements. The most recently pushed element is always the first one popped.

Category
Algorithm
Pricing
Free
Privacy
Browser-based
Signup
Not required

References

Privacy

Your data never leaves your browser unless explicitly stated. Stack Visualizer runs entirely client-side — no server upload, no logging, no tracking of your input.

New to this? Read the step-by-step explanation with Big-O analysis: Learn Data Structures →

Compare

Stack vs Queue

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