Compare two blocks of text by character, word, or line, and see additions and removals highlighted inline.
Both texts are compared locally in the browser. Nothing is uploaded or stored.
Both, layered — line alignment always runs first, then you choose whether the inline highlight within changed lines is character-, word-, or line-granularity. Line mode skips inline highlighting and just marks whole lines added or removed.
No cap on pasted or typed text. Uploading a file caps at 5MB — beyond that, paste the content directly instead.
Not currently — you can expand a collapsed unchanged section to see it, but there's no way to re-collapse it afterward in this version; each section only ever expands, one-way, for the rest of that comparison.
JSON Diff understands JSON structure (keys, nesting, array order); this tool treats input as plain text — better for prose, code, logs, or non-JSON content.
No — unlike some diff tools that send text to a server for comparison, this runs entirely in your browser, which matters for source code or sensitive text.