String Algorithm Visualizers

Step through pattern matching, prefix arrays, rolling hashes, edit operations, and subsequence dynamic programming without leaving the browser.

Use this hub when characters and their order matter

This collection separates exact substring search from string similarity. Pattern tools look for one contiguous match; dynamic-programming tools measure edits or preserve relative character order.

Working with numeric arrays? Use the general algorithm hub for windows, pointers, sorting, and numeric DP.Working with nodes and routes? Use the graph hub for traversal, shortest paths, and spanning trees.Need a direct text utility? Use the full tools directory for text comparison, regex, and word counts.

Choose a string algorithm by matching task

Use pattern-search tools for exact substring matches and dynamic-programming tools when the question is about edits or relative character order.

Find an exact pattern

Use KMP to reuse prefix information, Rabin Karp to compare rolling hashes, or the Z algorithm to reuse prefix-match ranges.

KMP String Matching Visualizer Rabin Karp Visualizer Z Algorithm Visualizer

Measure how strings differ

Use edit distance when insertions, deletions, and substitutions determine the cost of transforming one string into another.

Edit Distance Visualizer

Find shared character order

Use longest common subsequence when matching characters must stay in order but do not need to be adjacent.

Longest Common Subsequence Visualizer

Compare or test text directly

Use text compare, regex tester, and word counter for practical text inspection without running an algorithm trace.

Text Comparison Tool Regex Tester Word Counter

Compare string algorithms by the answer you need

Exact pattern algorithms all find substrings, but they reuse different information. Edit distance and LCS answer different similarity questions with two-dimensional state.

Visualizer	Best for	Important constraint	Typical time
KMP String Matching Visualizer	Deterministic exact matching with reusable prefix information	Build the longest-prefix-suffix table for the pattern first	O(text + pattern)
Rabin Karp Visualizer	Rolling-hash matching and comparing multiple candidate windows	Equal hashes still need a character check because collisions exist	Average O(text + pattern)
Z Algorithm Visualizer	Prefix-based matching and inspecting repeated prefix ranges	Combine pattern and text with a separator not present in either	O(text + pattern)
Edit Distance Visualizer	Minimum insertions, deletions, and substitutions	The result measures transformation cost, not a contiguous match	O(n × m)
Longest Common Subsequence Visualizer	Characters shared in order without requiring adjacency	A subsequence is not the same as a substring	O(n × m)

Pattern matching

Compare prefix-based matching, rolling hashes, possible collisions, and Z-box expansion for substring search.

KMP visualizer showing an aligned text and pattern comparison

KMP String Matching Visualizer Visualize KMP string matching online. Enter text and pattern, build the LPS table, and step through comparisons, fallbacks, and match indexes.

Rabin Karp visualizer showing a completed rolling-hash match at index 10

Rabin Karp Visualizer Visualize Rabin-Karp string matching online. Enter text and pattern, adjust base and modulus, then step through rolling hash checks. Z Algorithm Visualizer Visualize the Z Algorithm online. Enter text and pattern, build the combined string, inspect Z-box reuse, and find pattern match indexes.

String dynamic programming

Inspect edit operations, table transitions, backtracking, and subsequence choices across two strings.

Edit Distance Visualizer Visualize edit distance online. Enter two strings, fill the Levenshtein DP table, and inspect insert, delete, substitute, and match decisions. Longest Common Subsequence Visualizer Visualize longest common subsequence dynamic programming online. Enter two strings, fill the LCS table, and backtrack one subsequence.

Adjacent developer text tools

Use browser text utilities next to the visualizers when you need to compare content or test regular expressions.

Regex Tester Test JavaScript regular expressions online. Enter a pattern, choose flags, inspect matches and capture groups, and preview replacements in your browser. Text Comparison Tool Compare two blocks of text online and review added, removed, or changed words with a clear side-by-side difference view. Word Counter Free online word counter tool. Quickly count words in any text or document. Useful for writers, students, and content creators to stay within word limits.

Related tool hubs

Algorithm Visualizers Use free algorithm visualizers for sorting, binary search, sliding window, dynamic programming, backtracking, graph algorithms, and string matching.Graph Algorithm Visualizers Use free graph algorithm visualizers for BFS, DFS, Dijkstra, A Star, Bellman Ford, Floyd Warshall, topological sort, Kruskal, and Prim.Data Structure Visualizers Use free data structure visualizers for lists, stacks, queues, trees, graphs, arrays, recursion, DP, sorting, and algorithm patterns.

String Algorithm Visualizers FAQ

Which string matching visualizers are included?

The string hub links to KMP, Rabin Karp, and Z Algorithm visualizers for comparing different substring search approaches.

Which tool shows edit distance?

Use the Edit Distance Visualizer to inspect insert, delete, replace, and match decisions in a dynamic programming table.

Are these string tools useful for interviews?

Yes. They are designed for small practice inputs and common interview patterns such as pattern matching, subsequences, and edit distance.