Diff Checker

Compare two text blocks side-by-side or inline to highlight and analyze differences instantly.

Original Text (Before)

Modified Text (After)

Detailed Guide: Understanding Diff Layouts

Checking differences is a standard workflow in software development (e.g. git diff), technical writing, and legal audits. It helps highlight updates without reading unchanged text from scratch.

Split View vs Unified View:

Split View (Side-by-Side): Maps corresponding lines horizontally. Recommended for reading structural revisions.
Unified View (Inline): Places additions directly below removals in a single combined timeline. Good for standard terminal output reading.

Algorithmic Approach:

The LCS algorithm solves dynamic programming sub-problems to find the longest sequence of lines shared by both arrays. Unmatched entries indicate edits, allowing the builder to map deletions (red) and additions (green) securely.

How to Use Diff Checker

Input Original Text

Paste your source or original text block into the left editor panel.

Input Modified Text

Paste your edited or secondary text block into the right editor panel.

Analyze Differences

Click Compare. Switch between side-by-side Split View or unified Inline View.

Frequently Asked Questions

How does the comparison algorithm highlight changes?

We use a line-level Longest Common Subsequence (LCS) backtrack algorithm. Deleted lines are highlighted in red (left) and newly added lines are highlighted in green (right).

Can I compare code snippets?

Yes, definitely. You can compare source code files, JSON outputs, lists, HTML scripts, or plain text articles to identify exact adjustments.

Are there character limit limitations?

While there is no hard limit, the comparison runs client-side. Processing files with thousands of lines may take a brief moment as the browser builds the LCS matrix.