Text Diff Checker
Compare two blocks of text side-by-side with color-coded highlighting of every difference
How to Use This Tool
Paste the original text in the left editor and the modified text in the right editor.
View the visual diff output below — added lines in green, removed lines in red, unchanged lines in normal style.
Switch between "Line Diff" (full-line comparison) and "Inline Diff" (character-level changes highlighted within lines).
Check the stats for a quick summary, then click "Copy Diff" to copy the diff output.
About This Tool
Text Diff Checker compares two versions of text and highlights every difference between them. The line diff mode shows which lines were added, removed, or left unchanged, with color-coded backgrounds and +/- indicators — just like a code review tool. The inline diff mode goes deeper, highlighting the exact characters that changed within modified lines, making it easy to spot subtle edits like typos or small wording changes. The tool uses a Longest Common Subsequence (LCS) algorithm for accurate diff computation. Stats show the total number of added, removed, and unchanged lines at a glance. Perfect for comparing code versions, document drafts, configuration files, or any two texts.
Frequently Asked Questions
Line Diff compares text line-by-line and marks entire lines as added, removed, or unchanged. Inline Diff also highlights the specific characters within a line that changed — useful for spotting small edits like a single word or typo.
The tool uses a Longest Common Subsequence (LCS) algorithm, the same foundational approach used by tools like git diff. It produces optimal diffs that minimize the number of changes shown.
Yes! The monospace font and line-number display make it well-suited for comparing code, configuration files, JSON, and other structured text.
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