Text Diff
Compare two texts and highlight line-by-line differences
Paste text into both panes to see the differences.
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How to use
Paste the original text on the left and the changed version on the right. The diff output appears below with added lines in green and removed lines in red.
Paste the original text on the left
Enter the baseline text — the version you started with — in the left pane.
Paste the changed text on the right
Enter the newer or modified version in the right pane. The diff updates automatically.
Read the diff output
Lines prefixed with + are additions (present only in the right); lines prefixed with − are removals (present only in the left); unmarked lines are identical.
Examples
Comparing config file revisions
Paste an old config file on the left and a new one on the right. The diff highlights every added option and every removed or renamed key, so you can audit configuration changes before applying them.
Proofreading a rewritten paragraph
Paste the original paragraph on the left and the revised version on the right. The line diff shows exactly what changed sentence by sentence, making it easy to accept or revert individual edits.
About this tool
Paste two versions of a text side-by-side to see which lines were added, removed, or unchanged. The diff uses a longest common subsequence algorithm so only genuinely changed lines are flagged — untouched lines stay neutral. Useful for comparing document revisions, configuration files, or any two blobs of text. All processing happens in your browser.