Compare two blocks of text instantly with split and unified views, readable line numbers, local processing, and copy-ready results.
Changes update live as you type.
+4 Added-4 RemovedQuickDiff helps editors compare text fast.Paste the first version into the original pane.Whitespace changes can be noisy in long documents.Line numbers make review easier.All comparison work happens locally.QuickDiff helps teams compare text fast.Paste the latest version into the modified pane.Whitespace changes can be noisy in long documents.Line numbers make review and handoff easier.All diff calculations happen locally in your browser.Paste your older content into Original Text and the revised copy into Modified Text. QuickDiff calculates the comparison as soon as either pane changes, so there is no upload step and no waiting for a server round trip. Use Load Sample to see the format, Swap Panes when the versions are reversed, and Clear Both when you want a clean workspace. The Added and Removed badges give a fast count of changed lines before you start a detailed review.
Split View places the original and modified documents side by side with synchronized scrolling, which is useful for reviewing paragraph edits and checking where lines moved. Unified View stacks the diff in a single inline stream, similar to code review patches, with removed lines marked in red and added lines marked in green. Turn on Ignore Whitespace to reduce formatting noise, or Case Insensitive when capitalization is irrelevant to the comparison.
Diff calculations run 100% locally in your browser. Your text is held in page state only while the tab is open and is never sent to a remote comparison API by this tool. That makes QuickDiff a practical choice for drafts, configuration snippets, release notes, legal copy, support responses, and other working text that should stay on your device while you inspect line-level changes.