Text Diff Checker
Paste two versions of a text and compare them. Added and removed lines are highlighted, the words that changed inside a line are marked one by one, and the result can be read side by side or as a single inline diff.
Questions about text diff checker
How is the comparison calculated?
The two texts are compared line by line with a longest-common-subsequence diff, so a moved block is reported as one removal and one addition rather than as every line changing. Inside a changed line the diff is repeated word by word, which is why only the words that really changed are highlighted.
What is the difference between the two views?
Side by side puts the original and the changed text in two columns so you can read them as one document. Inline merges them into a single stream, where removed text is struck through and added text is underlined — the layout you want when you are reading a changelog.
Is my text sent anywhere?
No. The comparison runs in the page itself, so confidential drafts, contracts and code never leave your device. The two text boxes also accept a file from disk, which is quicker than pasting a long document.
Can I ignore formatting differences?
Yes. The comparison options can ignore whitespace changes and letter case, so a re-indented or re-capitalised document is reported as unchanged when that is what you care about.
Related tools
Other utilities on Utilith that pair well with this one.