Text Diff Checker is a free online tool that compares two blocks of text and highlights the differences between them. It clearly shows additions, deletions, and modifications, making it easy to see exactly what changed between two versions of a document, code file, or any text content.
The tool supports both word-level and character-level comparison modes, allowing you to choose the granularity that best suits your needs. Whether you are reviewing code changes, tracking document revisions, or proofreading edited content, the visual diff makes it simple to spot every modification.
All comparison processing happens locally in your browser, so your text data remains completely private. There is no limit on text length, and the tool works with any type of text including code, prose, configuration files, and more.
Enter or paste the original version of your text into the left input area. This serves as the base for comparison.
Enter or paste the modified version of your text into the right input area. The tool will compare this against the original.
Click the compare button to generate the diff. The tool will analyze both texts and highlight all differences with color coding.
Examine the highlighted output where additions appear in green, deletions in red, and common text remains unchanged. Toggle between word-level and character-level views.
Color-coded output clearly shows additions in green and deletions in red for instant understanding
Switch between word-level and character-level comparison for the right granularity for your use case
View original and modified text side by side with aligned differences for easy navigation
Your text is compared locally in the browser. No data is sent to any server, keeping your content private
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