Text Diff Checker
/text-diff-checkerCompare two texts side-by-side and find added, removed, and changed lines with color highlighting.
Comparing two versions of a config file, article, or code block by eye is slow and error-prone. This checker compares texts line by line and color-codes added, removed, and changed lines. It works well for document revisions and finding accidental edits. The comparison is performed locally, so confidential text stays on your device.
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FAQ
Frequently asked questions
Everything you need to know about text diff checker.
How does the comparison work?
Lines from both texts are compared in order. Matching lines are neutral, lines missing on one side are added or removed, and differing lines are marked changed.
Is this a real diff algorithm?
It is an ordered line-by-line comparison, not a longest-common-subsequence diff, so inserting blocks mid-text can shift which lines appear changed.
What do the colors mean?
Green marks added lines, red marks removed lines, yellow marks changed lines, and gray marks identical content. A summary counts each category.
Can I get a plain-language summary?
Yes. When changes exist, the tool generates an AI-style summary sentence describing the scale of additions, removals, and modifications.
Are my texts uploaded?
No. The comparison runs entirely in your browser, so pasted text never leaves the page or any server.
Does whitespace count as a difference?
Yes. Lines are compared as raw strings, so trailing spaces or tabs make a line appear changed even when the text looks identical.
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