Text Compare
A free online text diff checker and text comparison tool. Paste your original and modified text below, then compare to highlight additions, removals, and exactly how much of the text changed.
Frequently asked questions
What is a text diff checker?
A text diff checker (also called a text comparison tool) compares two blocks of text and highlights exactly what was added, removed, or changed between them — down to the word and character level.
How is the percentage changed calculated?
It's the share of words that were added or removed out of all the words across both versions. A 0% score means the two texts are identical; higher scores mean more of the content changed.
Is my text uploaded anywhere?
No. The comparison runs entirely in your browser — nothing is uploaded or stored on a server, so it's safe to paste sensitive or private text.
Can I compare paragraphs, code, or full documents?
Yes. The tool diffs line by line and then word or character by word within changed lines, so it works well for prose, code snippets, and longer documents alike.