About this tool
A diff checker compares two blocks of text and marks what was added or removed. Choose line comparison for files and code, word comparison for natural text, or character comparison for small exact edits. Addition and deletion counts summarize the amount of change without making you count highlighted sections manually.
Both versions remain in your browser, are never uploaded, and disappear after you close the tab. Use split view to place originals and revisions side by side, or unified view to read changes in one stream. Ignore case or whitespace when capitalization and spacing should not count as meaningful differences.
How to use the Diff Checker
- 1Paste the original text into the left comparison editor.
- 2Paste the revised text into the right comparison editor.
- 3Select line, word, or character matching for the material.
- 4Toggle case and whitespace handling to remove irrelevant differences.
- 5Review split or unified output and the addition and deletion totals.
Features
Three comparison levels
Compare complete lines, individual words, or exact characters based on your task.
Split difference view
Read original and revised content side by side with changes aligned.
Unified change stream
Inspect removals and additions together in one continuous diff presentation.
Case whitespace filters
Ignore capitalization or spacing when those differences should not affect the result.
Addition deletion counts
See separate totals for inserted and removed content after each comparison.
Frequently asked questions
Should I compare by lines, words, or characters?
Use lines for source files or documents, words for rewritten natural text, and characters when a small spelling or punctuation change matters.
What does ignore whitespace do in a diff?
It prevents spacing changes from being reported as meaningful differences. This helps when indentation changed but content did not.
How is split view different from unified view?
Split view places versions in separate columns. Unified view combines removals and additions into a single sequence.
Can the checker ignore capitalization changes?
Yes. Enable ignore case when uppercase and lowercase differences should be treated as equal.
Are the compared documents uploaded?
No. Comparison happens locally in your current tab, and neither version is kept after you close it.