Find differences between two blocks of text or code instantly. Paste your original copy on the left and your modified copy on the right, then hit compare. View changes in aligned side-by-side panels or a combined inline list.
When editing documents, checking source code revisions, or auditing drafts, identifying small differences manually is incredibly error-prone. Our Text Compare Online (Diff Checker) is a fast, interactive utility that visualizes changes between two blocks of text. Paste your original version and modified version to instantly see highlighted additions (green) and deletions (red). Supports side-by-side dual panes or single column inline modes, character-level comparison, and operates completely offline inside your browser for total confidentiality.
Toggle between Side-by-Side columns or Inline merged layouts to audit edits comfortably.
Highlights whole lines that changed, as well as specific character-level differences inside those lines.
Scrolling through one pane automatically scrolls the other, keeping comparisons aligned.
Your text comparison happens locally in JavaScript. No data is stored, protecting sensitive intellectual properties.
Compare config files, scripts, or HTML layouts to find bugs or code additions before deployment.
Track changes between drafts, essays, or articles to review improvements made by editors.
Compare contract revisions side-by-side to verify clauses, deletions, and additions.
It uses a local diffing algorithm that breaks text into lines and characters. Deletions are shown in red background with a minus (-) prefix, and additions are shown in green with a plus (+) prefix.
Yes. It is highly suited for PHP, JS, CSS, Python, HTML, and other plain-text files.
We support comparing files up to several thousand lines smoothly in the browser.
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