2 つのテキストをオンラインで比較 — すべての相違点を即座に見つけます

Contracts, translations, code and documents evolve. Paste two versions and see exactly what changed, word by word, without uploading anything.

テキストの差分ツールが必要なのは誰ですか?

Lawyers reviewing contract amendments. Translators checking revisions. Developers comparing config files. Writers editing drafts. Anyone who needs to know precisely what changed between two versions of a text.

どのように機能するのでしょうか?

The tool uses a longest-common-subsequence algorithm to match words between the two texts. Additions are highlighted in green, deletions in red with strikethrough. You see the exact count of additions and deletions at a glance.

私のテキストは非公開ですか?

Yes. Both texts are compared entirely in your browser. No server sees your contracts, translations or confidential documents. This makes it safe for legal, medical or business texts that cannot leave your device.

ブラウザベースのユーティリティ ツールを使用する理由は何ですか?

Online utilities like password generators, text formatters, and URL cleaners are convenient, but most send your data to remote servers. Our browser-based tools process everything locally — your passwords, text, and URLs never leave your device.

This is especially important for sensitive operations like generating passwords, checking password strength, or cleaning URLs that contain tracking parameters. With Presend, you get the convenience of online tools with the security of offline software.

当社のユーティリティツールがあなたのプライバシーをどのように保護するか

1. All processing happens in your browser using JavaScript
2. No data is transmitted to external servers
3. No cookies or tracking scripts monitor your usage
4. Your input data is cleared when you close the tab

当社のユーティリティ ツールを使用すると何ができるでしょうか?

Generate cryptographically secure passwords, check password strength against entropy analysis, convert between JSON and CSV formats, compare text differences, split long text into social media threads, clean tracking parameters from URLs, validate email lists, check color contrast for accessibility, and convert images to Base64 for embedding.

これらのツールは本当に無料ですか?

Yes — all our utility tools are completely free to use, with no registration required, no usage limits, and no watermarks. We believe privacy tools should be accessible to everyone, not locked behind paywalls or subscription models.