Paste two versions of a text and see exactly what changed — line by line or word by word, entirely in your browser.
Text Diff Checker compares two pieces of text and highlights every difference between them: added content in green, removed content in red, and everything unchanged left as plain text. Switch between line-level diffing — ideal for comparing paragraphs, articles, contracts or config files — and word-level diffing, which pinpoints the exact words that changed inside an otherwise identical sentence. It's built for writers checking a revision against a draft, developers comparing two versions of a text-based file, translators verifying an update, or anyone who's ever squinted at two documents trying to spot what's different. The comparison runs entirely in your browser using a proper diff algorithm (the same family used by version control tools), so nothing you paste is ever uploaded, logged or stored anywhere.
Paste the original version on the left and the changed version on the right.
Choose "Lines" to compare paragraph by paragraph, or "Words" to spot exact word-level changes within a line.
Added content is highlighted in green, removed content in red — copy the full diff report with one click if you need to share it.
Both texts are compared entirely in your browser — never uploaded, logged, or stored anywhere.
Compare whole lines for a quick overview, or drill into word-level changes inside a single sentence.
Powered by the same shortest-edit-script approach used by version control tools, not a naive character comparison.
Compare as much text as you like, with no limits, sign-up or hidden fees.
Type or paste your text, or upload a .txt file, and see live word, character, sentence, paragraph and line counts — nothing ever leaves your browser.
Type or paste your text and instantly convert it to any letter case — from Title Case to camelCase — right in your browser.