Text Compare / Diff Checker
Compare two blocks of text or code side by side, with line and word level differences.
Runs entirely in your browser.
Your data never leaves this device and is never sent to our servers.
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Differences
Paste text into both panes to compare them.
Spotting the difference between two near-identical files by eye is unreliable. This diff checker aligns the two versions and marks every insertion and deletion, down to the word inside a changed line.
Useful for comparing a config file against a known-good copy, checking what an editor changed, or reviewing a snippet before pasting it into a codebase.
How to use it
- Paste the original text on the left.
- Paste the changed version on the right.
- Read the highlighted differences.
- Toggle whitespace sensitivity if indentation changes are noise.
Not working as you expect? Report a problem with this tool.
Frequently asked questions
Is my text uploaded?
No. The comparison runs in your browser, which matters because config files and source code frequently contain credentials.
What is the difference between line and word diff?
Line diff marks whole lines as added or removed. Word diff goes inside a changed line and marks the specific words, which is far more readable for prose.
Can it ignore whitespace?
Yes. Turn it on when reformatting has changed indentation and you only care about substantive edits.