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Pixie Compare Text Tool

Paste two versions of any text and instantly see what changed โ€” added lines in green, removed lines in red. Ideal for proofreading edits, comparing contract drafts, checking code or config changes, and catching plagiarism or duplicate copy. Runs entirely in your browser.

+2 addedโˆ’1 removed
The quick brown fox
The quick red fox
jumps over the lazy dog
The end

Tip: comparison runs entirely in your browser โ€” nothing is uploaded. Green lines exist only in the changed text; red lines only in the original.

How the Compare Text works

Three simple steps. No signup. No installation.

1

Paste both versions

Drop the original text on the left and the changed text on the right.

2

See the differences

A line-by-line diff highlights additions in green and removals in red, with a running count.

3

Tune the match

Optionally ignore case and leading/trailing spaces so only real changes show up.

How a text diff actually finds changes

Comparing two pieces of text is a surprisingly deep problem, and the elegant answer is an algorithm called the longest common subsequence, or LCS. Rather than comparing the texts character by character โ€” which would flag everything after a single inserted word as "changed" โ€” LCS finds the longest sequence of lines that appears in both versions in the same order, then treats everything not in that sequence as either an addition or a removal. That is why a good diff can insert one new paragraph in the middle of a document and still recognize that everything around it is unchanged, instead of marking half the file red. It is the same core technique that powers "track changes" in word processors and the side-by-side views in version-control tools like Git. This tool applies LCS at the line level and colors the result: green for lines that exist only in your changed text, red for lines that existed only in the original, and neutral for the common backbone. The optional case- and whitespace-insensitive modes let you decide what counts as a "real" difference โ€” useful when comparing code where indentation is noise, or prose where capitalization at the start of a re-flowed line is not a meaningful edit. Because the whole comparison happens in your browser, you can safely diff sensitive material โ€” contracts, medical notes, unreleased copy โ€” without it ever leaving your device.

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