無料オンラインテキスト差分チェッカー

A diff algorithm (typically Myers diff) compares two texts and identifies the minimum set of additions and deletions needed to transform one into the other. It's the same technology used by Git to show code changes.

Yes. The tool handles any text including code, HTML, JSON, SQL, and markdown. For syntax-highlighted code diffs, paste code as-is — the content is compared as text regardless of programming language.

Line diff marks entire lines as added/removed (like Git). Word diff highlights individual changed words within lines, which is more useful for prose editing and detecting small word substitutions.

All comparison is done entirely in your browser. No text is transmitted or stored anywhere.

The tool compares exactly two inputs at a time. For multi-version comparison, run multiple paired comparisons (v1 vs v2, then v2 vs v3).

Yes, the テキスト差分チェッカー on Allio Tools is completely free with no sign-up or registration required. It works directly in your browser.

2つのテキストを比較し、差異をハイライト表示します。 No data is sent to a server — everything runs locally in your browser for maximum privacy and speed.

No installation needed. The テキスト差分チェッカー runs entirely in your web browser on any device — desktop, tablet, or mobile.

Completely safe. The テキスト差分チェッカー processes everything locally in your browser. No input data, results, or usage information is ever transmitted to or stored on any server.

After the page loads for the first time, the テキスト差分チェッカー works without an internet connection for all client-side processing. Tools that fetch live external data (such as DNS or network lookups) require an active connection.

The テキスト差分チェッカー has no hard character limit — it processes text as large as your browser can handle, typically hundreds of thousands of characters. Very large inputs may be slower depending on your device.

Yes. The テキスト差分チェッカー handles all Unicode text correctly, including accented characters, CJK characters, Arabic, Cyrillic, and emoji. It works with any language that your browser renders, with no additional setup or language packs required.

Yes. The テキスト差分チェッカー is built with standard browser APIs and works on all modern browsers including Chrome, Firefox, Safari, and Edge — on both desktop and mobile. No plugins, extensions, or third-party software are required.

Select and copy the result text to paste into any document or app. For image tools, a Download button saves the file directly to your device. Your browser's built-in screenshot function also captures results quickly. No account or login is required.