Text Diff
Compare two versions of a text word by word, with additions and deletions highlighted — no account, no upload, no size fuss.
This tool runs entirely in your browser. Your data never leaves your device — it is not uploaded to any server.
How to use
- 1Paste the original text into the left box.
- 2Paste the modified text into the right box.
- 3Read the merged view below: strikethrough marks removals, green marks additions.
Text Diff
Paste the original on the left and the edited version on the right: changed words light up immediately, deletions in one color and additions in another. It is the quickest way to review a contract revision, an editor's rewrite or a colleague's last-minute edits to a paragraph.
The comparison runs entirely in your browser — long contracts, unpublished manuscripts and confidential text never touch a server.
Frequently asked questions
How are differences displayed?
Unchanged text is plain; removed words are struck through in orange and added words are highlighted in green, so a paragraph reads like a tracked change.
Is it a character-level or word-level diff?
Word-level. Small edits inside a word are shown as one removed word plus one added word, which is easier to scan than a character-level diff.
Is there a size limit?
Only your browser's memory — book-length comparisons work, though very large texts take a moment to render.
Related tools
Find and Replace
Find and replace across thousands of words with case, whole-word and regex modes — see the match count before you commit.
All tools →
Sentence Counter
Count sentences instantly and see words, paragraphs and reading time next to them — a quick readability check for editors and writers.
All tools →
Word Counter
Count words, characters, sentences and reading time live as you type — CJK text handled correctly.
All tools →
Text Cleaner
Remove invisible characters, smart quotes, extra spaces and empty lines from text pasted out of PDFs, Word processors and chat apps.
All tools →
Embed this tool
Put this tool on your own site with one line — it runs entirely in the visitor's browser.
<iframe src="https://zoyku.com/en/tools/text-diff?embed=1" width="100%" height="640" style="border:0;border-radius:16px" title="Zoyku — text-diff" loading="lazy"></iframe>