Compare two blocks of text, code, or config - side by side or as a unified diff. Toggle ignore-whitespace and ignore-case, highlight the exact word that changed, and share a result by a link that carries the data itself, so no server ever sees it. Nothing is uploaded.
Compare two blocks of text, code, or config side by side or as a unified diff, entirely in your browser - nothing is uploaded, you can share a result by a link that carries the data itself, and you can export the differences as a .diff patch file.
Free, no sign-up. Both sides are compared right here in your browser - nothing is uploaded, which matters when you are diffing proprietary code, a config file, or a draft you would rather not paste into some random site. "Copy share link" packs both text blocks into the link itself (compressed), so a coworker opens the exact same comparison without any server storing it - just remember the link carries your text, so share it like you would share the text. "Ignore whitespace" skips indentation and trailing-space differences; "Format JSON" pretty-prints and sorts keys on both sides first, so you diff meaning instead of formatting noise. "Export .diff" gives you a standard unified patch. Part of techtuate, a growing collection of little tools that just work.
Compare: techtuate vs Diffchecker.com · all comparisons · more tools
Paste the original on the left and the changed version on the right. The differences are highlighted line by line, with word-level changes marked inside each changed line. It all runs in your browser.
Yes. This diff checker compares both sides locally in your browser, so your code or text is never uploaded to a server.
Yes. The share link encodes both text blocks into the link itself, compressed, so the other person opens the exact comparison instantly and nothing is stored on any server. The link carries your text, so share it only with people you would share the text with.
Side-by-side shows the original and changed text in two columns so you can read them in parallel. Unified view stacks the changes into one column with minus lines for removals and plus lines for additions, which is the format of a .diff or .patch file.