About this tool
This tool computes a line-level diff using Myers' shortest-edit-script algorithm, the same algorithm behind git diff, then highlights the exact words that changed within each modified line. Use side-by-side view for reviewing config files, policy documents or contracts, and unified view when you want a single diff-style column you can copy. Ignore whitespace hides re-indentation and trailing-space noise; ignore case treats letter case as identical. Everything is processed locally in your browser: your text is never uploaded, which makes it safe for sensitive configs, credentials or legal text.
Frequently asked questions
Is my text uploaded anywhere?
No. The comparison runs entirely in your browser using JavaScript. Nothing you paste or drop is sent to a server, so it is safe for confidential material.
What file types can I drop in?
Any plain-text file: source code, .txt, .json, .csv, config files, logs, Markdown and so on. For PDF and Word documents use the Document Diff tool; for spreadsheets use Excel & CSV Diff.
How is this different from Diffchecker?
Same core idea, but every CxO tool is client-side and free with no account, so your diffs never leave your computer even in the web version.