Text Diff
Compare two text blocks and highlight differences instantly. Visual comparison by line, word, or character.
Diff Options
Diff Tip: Use By Words for code or structured text. Use By Characters for minor typos or single-sentence comparisons. By Lines is best for comparing documents or large logs.
All comparisons are performed locally in your browser for total confidentiality.
Why use an Online Text Diff & Compare Tool?
Comparing two different versions of a text block—whether it's code, a legal document, or a simple grocery list—is one of those tasks that's nearly impossible to do accurately by eye. Manually searching for missing commas or changed words is slow and prone to error. Our Text Diff tool uses industry-standard algorithms to highlight every difference instantly. By pasting your 'Original' and 'Changed' text, you can see exactly where parts were added or removed. We support granular comparisons by **Line**, **Word**, or even individual **Characters**, giving you total control over how you see edits. Whether you're debugging code, proofreading an article, or tracking changes in a contract, this tool provides the visual clarity you need. Best of all, your data remains 100% private as all processing is done locally in your browser.
Visualize Every Change
Granular Comparisons
Toggle between line-by-line, word-by-word, or character-by-character diffing to find logic changes or small typos.
Visual Color Coding
Instantly recognize removals in red (with strikethrough) and additions in green for effortless scanning.
Live Processing
Results update in real-time as you type or paste text into either window—no refresh or submit button required.
Privacy First
Your comparison data is never uploaded to a server. Everything happens on your own device for maximum security.
Frequently Asked Questions
Which diff mode should I use for code?
For most code comparisons, 'By Words' or 'By Lines' is best. 'By Words' is particularly useful for finding variable name changes, while 'By Lines' helps track structural logic updates.
Can I use this for long documents?
Yes! The tool is optimized for speed and can handle large blocks of text. The 'By Lines' mode is recommended for comparing entire files or long articles.
What do the colors mean?
Standard diff conventions apply: Red text with a strike-through represents content that was removed from the original. Green text represents new content that was added in the version.
Is there a limit to how much text I can compare?
The tool works efficiently with thousands of lines. Performance depends on your browser's memory, but for most professional uses, there is no practical limit.