AnyTool
Your files never leave your device. All processing happens locally in your browser.

How do I compare two texts and see the differences?

Paste two texts into AnyTool's Diff Checker and the differences are highlighted instantly — line, word, or character level, side-by-side or inline. A real Myers/LCS engine runs in your browser, so nothing is uploaded.

  • Line, word, and character diff with a real LCS algorithm
  • Side-by-side and inline views with added/removed highlighting
  • Similarity %, ignore-whitespace, and ignore-case options
  • 100% in your browser — no upload, no signup, free

What is

Text Diff

A text diff compares two versions of text and reports what was added, removed, or unchanged. A proper diff uses a longest-common-subsequence (Myers/LCS) algorithm so inserted lines don't cascade into false changes.

Developer Tools

Related terms

LCS AlgorithmSide-by-Side CompareUnified DiffMerge

How to Compare Two Texts

Find the differences between two texts entirely in your browser.

15 secWeb browser
  1. 1

    Paste both texts

    Drop your original and changed text into the two panes.

  2. 2

    Choose granularity

    Pick line, word, or character diff and side-by-side or inline view.

  3. 3

    Review & export

    See added/removed highlights and the similarity %, then copy or download a unified diff.

Result: A highlighted diff and unified patch

Frequently Asked Questions

No — both texts are compared entirely in your browser and never uploaded.

AnyTool's Diff Checker runs the diff locally with the jsdiff engine, so your content never touches a server. There is no file-size cap, no ads-gating, and no signup — unlike tools that paywall merge/export or upload documents to compare them.

Yes — switch between line, word, and character diff instantly.

You can toggle all three granularities. Word and character diff highlight exactly which parts of a line changed, which most free tools that only do line-level comparison cannot.

Yes — it uses a real LCS algorithm, so inserting a line does not mark everything below it as changed.

The tool uses a Myers/LCS diff engine that correctly aligns matching lines, avoiding the cascading-false-change problem of naive line-by-line comparison.

Detailed Explanation

Methodology

How Diff Checking Works

AnyTool compares two texts with a real longest-common-subsequence (Myers/LCS) diff engine (jsdiff), not a naive line-by-line equality check. It offers line, word, and character granularity and renders both side-by-side (split) and inline (unified) views, with added/removed highlighting, a similarity percentage, and ignore-whitespace and ignore-case options. The diff runs entirely in the browser, so neither text is uploaded.

  • Myers/LCS algorithm — no cascading false changes
  • Line, word, and character granularity
  • Side-by-side and inline views with similarity %
  • Unified .diff/.patch export via createTwoFilesPatch
  • No upload, no size cap, no signup