Online Text Comparison | Text Diff Tool
The Text Diff tool lets you instantly find differences between two pieces of text. Paste the original and the modified version — and you'll immediately see what was added, removed, or changed. The highlighting works at the character level, providing maximum precision when analyzing changes.
Why compare texts? Text comparison is a fundamental task when working with any content. Developers use diff for code review and regression detection, editors use it to track changes in documents, and translators use it to verify translations against the original. Our tool runs entirely in your browser: your data is never sent to a server, and comparison results appear instantly as you type. It uses Google's diff-match-patch algorithm, which provides high-quality comparison even for large volumes of text.
Comparison Results
The online text comparison tool is a fast and convenient way to find differences between two versions of a text. You can compare source code, articles, configuration files, translations, and any other textual content. Results are displayed in real time: added fragments are highlighted in green, deleted ones in red with strikethrough, and matching parts in gray. This format lets you instantly see exactly what has changed.
The tool is especially useful for developers during code review, comparing configs across environments, or verifying auto-generated code. Editors and copywriters can use it to track changes between drafts, while SEO specialists can compare meta tags or page content. All processing happens client-side — your data never leaves the browser.
Under the hood, the tool uses the diff-match-patch algorithm developed by Google engineers. It provides accurate character-level comparison and works correctly with Unicode, including Cyrillic, CJK characters, and special symbols. The tool requires no registration, is completely free, and is available in both Russian and English. Just paste two texts — and the differences will be visible instantly.