About this text diff checker
A text diff checker (also called a text compare tool) shows you the difference between two blocks of text. Paste the original on top and the changed version below, and it lines them up and marks every change: lines only in the new version are shown as added, lines only in the old version as removed, and the rest as unchanged. It is handy for checking edits to an article, comparing two versions of a config file, reviewing contract wording, or seeing what a colleague altered. The comparison happens entirely in your browser — nothing you paste is uploaded or stored.
Frequently asked questions
- What does a text diff checker do?
- It compares two pieces of text and highlights every line that was added or removed, so you can see exactly what changed.
- Is my text uploaded anywhere?
- No. The comparison runs completely in your browser, so the text you paste never leaves your device.
- Does it compare line by line or word by word?
- This tool compares line by line, which is the clearest way to review edits in documents, notes and code.