<div class="nfaf-generated-content"><div class="nfaf-visual-card" style="--nfaf-accent:#16ebb8"><div class="nfaf-visual-icon" aria-hidden="true"><svg viewBox="0 0 64 64" role="img"><circle cx="32" cy="32" r="28" fill="currentColor" opacity=".12"></circle><path d="M20 34l8 8 17-19" fill="none" stroke="currentColor" stroke-width="5" stroke-linecap="round" stroke-linejoin="round"></path></svg></div><div><strong>Text Diff Checker</strong><span>Browser-first utility with visible inputs, outputs, and limitations.</span></div></div><p class="nfaf-lede">This checker makes small text revisions easier to inspect by comparing two versions in the browser and labeling changed lines instead of asking you to scan both documents manually.</p><p><strong>Designed for:</strong> Editors, developers, QA testers, and documentation teams reviewing small revisions.</p><h2>How to use this tool</h2><p>Paste the earlier version on the left and the revised version on the right. Compare reports lines that are unchanged, added, removed, or changed by position. Use short, representative inputs for the clearest review.</p><h2>How the result is produced</h2><p>The browser splits each input into lines and performs a simple dynamic-programming longest-common-subsequence comparison. It is designed for readable review, not a full patch-format implementation.</p><h2>Test examples</h2><p>Original: “status: draft” and revised: “status: published” are shown as a removed line and an added line. An added paragraph appears as an added line in the revised column.</p><h2>Limitations</h2><p>The comparison is line-oriented and may report a whole line as changed when only one word differs. It does not understand programming-language syntax, images, binary files, or collaborative merge conflicts.</p><h2>Privacy and processing</h2><p>Both text versions stay in the browser while the comparison runs. The tool does not upload them to a Nofyi processing endpoint.</p><h2>Related guide</h2><p><a href="https://nofyi.com/how-to-review-text-changes-with-a-diff/">How to review text changes without trusting a diff blindly</a></p><h2>Related tools in this category</h2><ul class="nfaf-related-tools"><li><a href="https://nofyi.com/tools/markdown-previewer/">Markdown Previewer</a><span>Write headings, emphasis, links, lists, and code fences to see a sanitized preview.</span></li><li><a href="https://nofyi.com/tools/word-character-counter/">Word and Character Counter</a><span>Paste text to see counts update in the browser as you type.</span></li><li><a href="https://nofyi.com/tools/html-to-text-extractor/">HTML to Plain Text Extractor</a><span>Paste HTML to remove tags and inspect the visible-text approximation.</span></li></ul><h2>Documentation</h2><ul><li><a href="https://en.wikipedia.org/wiki/Longest_common_subsequence_problem" rel="nofollow noopener" target="_blank">https://en.wikipedia.org/wiki/Longest_common_subsequence_problem</a></li><li><a href="https://git-scm.com/docs/git-diff" rel="nofollow noopener" target="_blank">https://git-scm.com/docs/git-diff</a></li></ul><p class="nfaf-disclosure">This page describes the implementation shipped with the NOFYI Tool Factory. Review the interface output before using it in a production workflow.</p></div><div class="nfaf-app-slot">[nfaf_tool_app]</div>
