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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).

Summary

Stack Visualizer is a free algorithm utility by Zerethon Tools. Interactive LIFO stack — push and pop with an animated top pointer and step controls. Runs in your browser. Runs entirely in the browser — no signup, no upload.

Category
Algorithm
Pricing
Free
Privacy
Browser-based
Signup
Not required

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.

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