Binary Tree Visualizer

The Binary Tree Visualizer is a free browser-based tool that lets you build, explore, and understand binary trees through interactive visualization. Whether you are studying data structures for the first time, preparing for coding interviews, or teaching algorithms, this tool provides an intuitive SVG-based canvas where you can see exactly how tree operations work in real time.

The tool supports two modes: Binary Search Tree (BST) mode enforces the BST invariant where every left child is smaller and every right child is larger than its parent, and General binary tree mode inserts nodes level by level using breadth-first filling. In BST mode you can perform insertion, deletion (handling leaf, single-child, and two-child cases with in-order successor), and search with animated path highlighting.

Four classic traversal algorithms are available — In-order, Pre-order, Post-order, and Level-order (BFS) — each with step-by-step node highlighting so you can watch the algorithm visit each node in sequence. The traversal result array is displayed beneath the controls for quick reference. You can also auto-balance an unbalanced BST using AVL rotations with a single click.

All processing runs entirely in your browser. No data is sent to any server — there are no network requests, no analytics on your input, and no accounts required. The visualization is rendered as inline SVG with responsive sizing, making it suitable for desktops, tablets, and phones.

Tree statistics are displayed in real time: height, node count, whether the tree is balanced, and whether the current structure is a valid BST. You can generate random trees for experimentation or enter comma-separated values for bulk insertion.

1. Choose a mode: BST (Binary Search Tree) or General binary tree using the mode toggle.
2. Type a number (or comma-separated list like 5,3,7,1,4) into the input field and click Insert or press Enter.
3. Click Random to generate a random tree, or Clear to start over.
4. In BST mode, use the Delete field to remove a node by value, or the Search field to highlight the search path from root to target.
5. Click a traversal button (Inorder, Preorder, Postorder, Level-order) to animate the traversal and see the result array.
6. Click Balance (AVL) to auto-balance the BST using AVL rotation logic.
7. Review the statistics panel for height, node count, balance status, and BST validity.
8. Use Ctrl+Enter as a keyboard shortcut to insert values quickly.