Text Compare (Diff Checker)
Paste two versions of a contract, article, list or piece of code and instantly see what was added, removed or left unchanged — line by line or word by word.
Runs in your browser
How to use
- Paste the original text on the left.
- Paste the changed text on the right.
- Choose line or word comparison.
- Review green (added) and red (removed) highlights.
How it works
Differences are computed with the Myers diff algorithm — the same algorithm used by Git — which finds the smallest set of insertions and deletions that turns the first text into the second.
Line mode is best for code, lists and structured documents; word mode is best for prose, where a small edit in a long paragraph would otherwise mark the whole line as changed.
Examples
- Contract review
- Paste the version you sent and the version you received back to spot every clause that changed.
- Config files
- Compare two configuration files with “ignore whitespace” to ignore indentation changes.
Common uses
- Reviewing edits to contracts and documents
- Comparing two versions of code or configuration
- Checking what changed in a web page's text
Privacy & security
This tool runs entirely in your browser. Your files and text are never uploaded to our servers — processing happens on your device and results are created locally. How each tool handles files
Frequently asked questions
Is it safe to compare confidential documents?
Yes. The comparison runs entirely in your browser; neither text is uploaded.
Can it compare Word or PDF files?
Copy the text out of the files and paste it here. Formatting differences (bold, fonts) are not compared, only text.
Last updated: