# apphelp tool profile
name: Text Diff Checker
tool: tool-textdiff
domain: textdiff.apphelp.net
canonical: https://textdiff.apphelp.net/en
summary: Compare text and code locally with split and unified views, line numbers, line/word/character highlights, ignore rules, summaries, and unified patch export.
inputs: Two pasted texts or two local text/code files, plus highlight precision and optional whitespace, case, blank-line, and unchanged-context rules.
outputs: Aligned original and changed lines, addition/removal highlights, line numbers, summary counts, a compact unified view, and a downloadable .diff patch with three context lines.
use-cases: review code and configuration changes; compare generated output with an expected fixture; inspect contract, policy, resume, and article revisions; create a patch for an issue or code review; identify whitespace-only or case-only differences
keywords: diff checker, text compare online, text diff checker, side by side diff, unified diff generator
languages: en, zh-CN, zh-TW, ar, de, fr
capabilities: paste/edit; local text-file loading; swap and sample; split and unified views; old/new line numbers; line, word, and character highlights; ignore whitespace, case, or blank lines; hide unchanged context; addition/removal/unchanged counts; patch copy and .diff download
limitations: text formats only; binary, PDF, Word, image, and spreadsheet comparison are unsupported; input, file size, and live alignment time are bounded; ignore case and blank lines affect visual review rather than rewriting the exported patch
patch-format: unified diff with original and changed filenames, hunk headers, plus/minus lines, and three context lines by default
seo: locale-routed canonical and hreflang metadata, sitemap, robots, SoftwareApplication, BreadcrumbList, FAQPage, and HowTo structured data
geo: direct answer summary, input/output contract, comparison-mode guidance, worked examples, patch semantics, edge cases, FAQ answers, and machine-readable llms.txt
privacy: local file reading, alignment, highlighting, copying, and patch generation happen in the browser; no file upload
analytics: Microsoft Clarity and Google Analytics (opt-in)
no-login: true