Text Diff Checker
Compare two texts and highlight every change.
Paste two versions to compare
Added words are highlighted in green, removed words in red.
Private by design. This tool runs entirely in your browser. Your input is processed on your own device and is not uploaded by DO101.
About the Text Diff Checker
Paste an original and a revised version to see exactly what was added, removed or left alone. DO101 shows a word-level diff so a single changed word does not light up the whole line.
How to use it
- 1Paste the original text on the left.
- 2Paste the changed text on the right.
- 3Read the highlighted diff underneath.
What you get
- Word-level highlighting
- Added / removed / unchanged counts
- Ignore case and whitespace options
- Works with long documents
- Nothing leaves your browser
Frequently asked questions
Can I compare code?
Yes. Word-level diffing works well for code, though for very large files a dedicated Git diff will be faster.
Is there a size limit?
The comparison is capped to keep the page responsive; extremely large documents are trimmed with a clear warning rather than freezing the tab.
Keep going
People who use this tool usually reach for these next.
Strip double spaces, blank lines and messy formatting.
Live word, character, sentence and reading-time counts.
Beautify, minify and validate JSON with error positions.
Switch text between UPPER, lower, Title, camel, snake and kebab.