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Text Diff Checker
Compare two blocks of text and highlight what changed.
About Text Diff Checker
Text Diff Checker is a free tool from Compile Labs, part of the Text collection. Compare two blocks of text and highlight what changed. It runs entirely in your browser: nothing you enter is uploaded, and there is no sign-up.
This page belongs to the Text category. Count, convert, compare and clean up text without leaving your browser. Like the rest of the site, it is designed to load quickly and stay simple to use on desktop and mobile.
How to use it
Paste or type your text
Add the text you want to work with to the input on this page. You can paste from a document or type it straight in. Nothing is uploaded while you do.
Choose your options
Pick the setting that matches what you need, such as case, line breaks or a counting mode, so the output fits the way you plan to use it.
Copy the result
Check the output, change anything you want, then copy it to your clipboard and paste it where it belongs. The whole thing runs locally in your browser.
Frequently asked questions
Is my text sent to a server?
No. This tool runs entirely in your browser, so the text you paste never leaves your device. There is nothing to upload and nothing stored on our side.
Do I need an account?
No sign-up is required. You can use the tool straight away, and there is no limit on how many times you run it.
Does it work offline?
Once the page has loaded, the processing happens locally, so it keeps working even if your connection drops.