Text Diff Checker — Online Text Compare
Compare two texts side by side and highlight changes. Fast, accurate, 100% client-side.
About this tool
Compare two blocks of text line by line. Additions and deletions are highlighted.
Great for quick reviews, edits, and changelogs.
FAQ
Is the diff computed locally?
Yes. The entire comparison runs in your browser; nothing is uploaded.
What type of diff is this?
Line-based Longest Common Subsequence (LCS). It highlights added/removed lines for quick reviews.
Can I ignore whitespace or case?
This version compares exact lines. For whitespace/case-insensitive options, paste normalized text or use the “remove extra spaces” tool first.
Does it handle large texts?
It works well for typical files and snippets. Extremely large inputs depend on your device memory and browser.
Can I share a prefilled comparison?
Yes. Use the Share button—the URL includes both sides (?a=...&b=...).