Text Diff Checker

Three Ways to Compare

Line diff compares the two texts line by line — the standard mode for code, configs, and any structured text. Each changed line is shown with a + or − prefix. Word diff goes deeper: within each changed line, it highlights the specific words that changed rather than marking the whole line. Best for prose, documents, and paragraphs. Character diff is the most granular — it highlights every individual character that differs, useful for spotting subtle typos, punctuation changes, or encoding differences.

Side-by-side vs Inline

Side-by-side shows Original on the left and Modified on the right, each with their own line numbers. Deletions are highlighted in the left panel, additions in the right — you never see both on the same line. This is the easiest view for reviewing large changes. Inline shows everything in a single stream, with deletions struck through in red and additions highlighted in green, which is more compact for small diffs.

Ignore Whitespace and Case

Whitespace changes — extra spaces, trailing spaces, tab vs space indentation — are often irrelevant when you want to see only the meaningful content changes. Tick "Ignore whitespace" to normalise all spacing before comparing. "Ignore case" makes the comparison case-insensitive, useful for comparing text where capitalisation differences are unimportant. These options apply to what is shown in the diff, not to the original text in the inputs.

Hide Unchanged Lines

On long documents with only a few changes, "Hide unchanged lines" removes all lines that are identical in both versions. Only the changed lines are shown, making it easy to jump straight to what matters. This is the equivalent of a collapsed diff view.