Text Diff Checker
Compare two texts and highlight what changed.
Compare two pieces of text and highlight the differences line by line, for free. Everything runs entirely in your browser — your files are never uploaded to a server, so your data stays private on your device.
Spotting changes the eye tends to miss
Comparing two versions of anything by reading them side by side is slow and error-prone — small but important changes (a swapped word, a different number, a removed line) easily slip past when you’re scanning two large blocks of text manually. This is a routine need when reviewing edits to a document, checking what changed between two versions of a configuration file, comparing drafts of an email or contract clause, or seeing exactly what a collaborator altered in a piece of writing.
Line-by-line highlighting, instantly
Paste the original text on one side and the revised version on the other, and every addition and removal is highlighted so the differences jump out immediately, line by line, instead of requiring a careful word-for-word read-through. There’s no practical size limit beyond what your device can comfortably handle, so it works just as well for a short paragraph as for a long document.
How to use diff checker
- Paste the original text on one side.
- Paste the changed text on the other.
- Review the highlighted differences.
Frequently asked questions
Does it show line-by-line changes?
Yes — additions and removals are highlighted so changes are easy to spot.
Is my text uploaded?
No — the comparison runs entirely in your browser.
Is there a size limit?
No imposed limit; performance depends on your device.