About DiffBunker

DiffBunker is a free tool for comparing two blocks of text or code. You paste an original and a changed version, and it shows what differs — line by line, with the specific words and characters highlighted inside each change.

Why it exists

Most people who need to diff text do it with something sensitive: contract redlines, API keys in a config file, a database dump, an internal log. The web tools that handle this are usually full products with accounts, saved history, and analytics or ad scripts on the page. Any of those is a path for pasted content to leave the browser. DiffBunker was built to remove that concern entirely by removing the features that create it.

How it is built

The site is a set of static pages. The comparison itself runs in a Web Worker in your browser, using a diff library bundled into the page — no remote code, no API. Once the page has loaded, it makes no further network requests: no analytics, no ads, no external fonts, no telemetry, and no backend for saving or sharing. You can confirm this in your browser's developer tools: open the Network tab, run a comparison, and watch that nothing is sent.

What else is here

There is a second tool, asemantic JSON diff, which compares structure rather than formatted text so reordered keys and reindentation do not register as changes. File upload for the text diff may follow. Any addition has to keep the same rule: nothing you put into the tool is sent anywhere.

Questions or feedback:get in touch.