Is my text or image uploaded when I compare it?
No. Text comparisons, three-way merges, Markdown previews, and image comparisons run locally in your browser. Your inputs are not sent to or stored on OptMyTool servers.
Diff Checker
Compare text and code, selectively accept changes, resolve three-way merge conflicts, preview Markdown, and compare images—all privately in your browser.
Line-by-line diffAccept selected blocks into the result
Enter text in either panel to compare. No differences found.
Diff Checker FAQ
How does the three-way merge work?
Provide a common base and two edited versions. Non-overlapping edits are combined automatically; overlapping edits are shown as conflicts that you can resolve by choosing either version or keeping both.
Can I compare PDFs or run code in the diff tool?
This version supports text, Markdown, and local image comparisons. It does not execute submitted code, synchronize folders or repositories, or render PDF diffs.
Privacy note: text and images are processed locally in this browser tab. No input is uploaded or stored on a server.