Compare two texts and highlight additions, deletions, and changes
The Text Diff Checker is a practical comparison tool that helps you quickly spot differences between two blocks of text. Whether you are reviewing code changes, comparing documents, or auditing content, it helps you get the job done more efficiently.
It compares text line by line and highlights added, removed, and changed content, so you can see the differences at a glance. It also offers swap and copy-result features for deeper analysis and processing.
Everything runs locally — your data is never uploaded. The clean, intuitive interface needs no technical background to use.
For a step-by-step deep dive, read our guide: How to Compare Two Texts and Spot Every Difference.
Compares both texts line by line and clearly shows the differences in each line.
Highlights added, removed, and changed content in different colors.
Swap the contents of the two text boxes in one click for easier comparison.
Everything runs locally; your data is never uploaded.
It compares two texts line by line and highlights exactly what was added, removed, or changed between them.
Added lines and removed lines are shown in distinct colors, so you can see the differences at a glance.
Yes. It works on any plain text, including source code, config files, and prose.
No. Both texts are compared locally in your browser, so the documents never leave your machine.
Paste the contents of both files into the two boxes, or upload them directly. The tool compares them line by line and highlights every difference without uploading your data.