The Best Free Text Diff Checker Online
Comparing two versions of a document, contract, or piece of code by hand is tedious and error-prone. The GadgetsFocus free online Text Diff Checker instantly compares two blocks of text and highlights every single line that was added, removed, or left unchanged.
How to Compare Text
- Paste Original: Copy the first version of your text and paste it into the “Original Text” box on the left.
- Paste Modified: Copy the second (updated) version and paste it into the “Modified Text” box on the right.
- Compare: Click the blue “Compare Texts” button.
- Review: The unified diff output will appear below, with added lines in green, removed lines in red, and unchanged lines in grey. A summary bar shows the total count of changes.
Use Cases
- Code Reviews: Quickly compare two versions of a script or configuration file to see exactly what changed.
- Legal Documents: Compare contract drafts to identify clause modifications.
- Academic Writing: Check how an essay changed between revision drafts.
- Content Writing: Compare an editor’s revised article with the original submission to see all edits.
Privacy
All comparison logic runs locally in your browser using a standard Longest Common Subsequence (LCS) algorithm. Your sensitive documents and proprietary code are never uploaded to our servers.