Stack Visualizer — Push & Pop (LIFO)
Interactive LIFO stack — push and pop with an animated top pointer and step controls. Runs in your browser.
Pseudocode
Run an operation to see its steps.
Avg · Worst
How to use
- 1 Type a number and press Push to add it to the top of the stack.
- 2 Press Pop to remove the top element (last in, first out).
- 3 Use Random to push a random value, or Clear to empty the stack.
- 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).
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.
New to this? Read the step-by-step explanation with Big-O analysis: Learn Data Structures →
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