Queue Visualizer — Enqueue & Dequeue (FIFO)
Interactive FIFO queue — enqueue and dequeue with animated front/rear pointers 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 Enqueue to add it at the rear of the queue.
- 2 Press Dequeue to remove the element at the front (first in, first out).
- 3 Use Random to enqueue a random value, or Clear to empty the queue.
- 4 Step back and forward through any operation.
Why use this tool
- See the FIFO rule: the first value enqueued is the first one dequeued.
- Watch the "front" and "rear" pointers as the queue grows and shrinks.
- Understand why enqueue and dequeue are O(1).
- Runs entirely in your browser. No signup, no uploads.
Frequently asked questions
What is a queue?
A queue is a FIFO (first-in, first-out) collection: elements are added at the rear (enqueue) and removed from the front (dequeue).
What is the time complexity of queue operations?
Enqueue and dequeue are O(1) with the right implementation (a linked list or a circular buffer).
What are queues used for?
Task scheduling, breadth-first search, buffering, print spooling, and any first-come-first-served processing.
What is a circular queue?
A queue implemented on a fixed-size array whose front and rear indices wrap around, reusing freed slots without shifting elements.
What is Queue Visualizer?
A Queue Visualizer animates a queue — a first-in, first-out (FIFO) collection where values are added at the rear (enqueue) and removed from the front (dequeue). Both operations are O(1).
Queue Visualizer is a free algorithm utility by Zerethon Tools. Interactive FIFO queue — enqueue and dequeue with animated front/rear pointers 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. Queue 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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