How is this different from a line-level diff?

A line-level diff marks entire lines as added or removed. This tool works at the word level, so if a single word changes within a line, only that word is highlighted — not the whole line. This is much easier to read for prose text.

What do the colors mean?

Green background = word added in the revised text. Red background = word removed from the original. Orange background = word that changed (a removal immediately followed by an addition in the same position).

Is my text sent to a server?

No. All comparison logic runs entirely in your browser using JavaScript. Your text never leaves your device.

What algorithm is used?

The tool uses the Longest Common Subsequence (LCS) algorithm applied to word tokens. LCS finds the minimal set of insertions and deletions needed to transform one sequence into another, which produces clean, human-readable diffs.

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Word-Level Text Diff Tool

Compare two texts word by word with color-coded additions, deletions, and changes side by side.

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About this tool

The Word-Level Text Diff Tool compares two blocks of text at the word level and highlights exactly what changed between them. Unlike line-level diff tools, this tool operates word by word, making it easy to spot small edits, substitutions, or rewordings inside a paragraph. Paste the original text on the left and the revised text on the right, then view a merged diff panel that color-codes every change: green for added words, red for removed words, and orange for words that changed in place. A statistics bar shows total words added, removed, and changed at a glance. The side-by-side layout makes it ideal for proofreading drafts, reviewing document revisions, or comparing API responses. No server upload — all processing happens locally in your browser.

How to use

1 Paste the original text into the left textarea.
2 Paste the revised text into the right textarea.
3 The diff updates automatically as you type.
4 Read the color-coded merged view: green = added, red = removed, orange = changed.
5 Check the stats bar for a count of words added, removed, and changed.

Frequently Asked Questions

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