Home › Text Tools › Text Diff Checker
Compare two blocks of text side by side — additions highlighted in green, deletions in red — and see exactly what changed between two versions.
Add the first version of your text into the left panel — the original or older version.
Add the updated version into the right panel. The comparison runs automatically.
Added text is highlighted in green, removed text in red. Toggle between side-by-side view and inline unified diff view.
The checker finds character-level, word-level, and line-level differences depending on the mode selected. Added characters or words appear in green; removed characters or words appear in red. Unchanged content is shown in neutral text. This makes it immediately clear what was reworded, added, or deleted between two versions.
The unified (or inline) diff view shows both versions in a single column rather than side by side — with + lines for additions and - lines for deletions. It’s the format used by Git’s git diff output and most code review tools. The side-by-side view is easier to read for prose; unified view is more familiar for developers reviewing code changes.
Yes. The diff checker works on any plain text — prose documents, code files, JSON, configuration files, CSV data, or any text content you can paste. It doesn’t interpret code syntax; it compares raw text. For syntax-highlighted code comparison, the output will show differences but won’t colour-code by language.
No. Diff comparison runs entirely in your browser using JavaScript. Neither version of your text is uploaded or transmitted to any server — useful when comparing drafts that contain confidential content.
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Comparing two versions of a document is a task that comes up constantly — tracking changes between a draft and a revision, checking what an editor changed in your article, verifying that a translation preserves the same structure, or confirming what was added to a contract or policy update. Without a diff tool, you’re reading both versions and trying to spot differences manually. This checker highlights every addition and deletion visually so the changes are immediately obvious, regardless of document length. It works equally well for prose and code, and runs entirely in your browser so documents with confidential content never leave your device.
All diff comparison runs in your browser. Neither version of your text is uploaded or transmitted to any server.
