Compare two texts side-by-side with color-coded additions, deletions and changes. No data leaves your browser.
A text diff checker compares two versions of text and highlights the differences between them. It works line by line, identifying which lines were added, removed, changed or left unchanged. This is essential for writers reviewing edits, developers comparing code versions, translators checking localized text, and anyone who needs to spot changes between two documents. Our tool uses color-coded highlighting — green for additions, red for deletions and yellow for modifications — making differences instantly visible. The comparison runs entirely in your browser using JavaScript, so your sensitive documents are never uploaded to any server. Unlike command-line diff tools, this visual interface shows both versions side by side with line numbers, making it easy to trace exactly what changed and where.
Enter your original or baseline text in the left textarea.
Enter the updated or modified version in the right textarea.
The tool instantly highlights differences with colors. Green means added, red means removed and yellow means the line was changed.
Click Copy diff to get a unified diff format you can share or save.
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