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Privacy Policy

Last updated: November 13, 2026

Your files never leave your device. VS (Compare Anything) is a client-side tool. Every comparison — text, images, Word, Excel, PDF, PowerPoint, or entire folders — is performed by JavaScript running in your browser. We operate no upload endpoint, no user accounts, and no database of your documents.

The site is operated by Yuhu Chen, an individual established in Xuzhou, Jiangsu, China, who is the data controller for the purposes of this policy. Contact: [email protected].

1. What we process locally

When you open or drop a file, the browser reads it through the File API or the File System Access API. Its contents are parsed in memory and rendered on your screen. Neither the file bytes nor any text extracted from them are transmitted to us or to any third party.

2. What is stored on your device

The site uses localStorage (and IndexedDB where available) only to keep your own working state on that browser:

  • your language preference;
  • text-comparison drafts and history (capped at 20 entries / 800,000 characters by default);
  • a fingerprint index used to speed up repeated folder comparisons;
  • an anonymous analytics identifier and your analytics opt-out choice;
  • an optional license key, if you activate a paid edition in a future release.

This data stays in your browser profile. Clearing site data removes it permanently — which also means we cannot recover your drafts or history for you, because we never had a copy.

3. Anonymous usage statistics

We use Umami Cloud, a cookie-free, privacy-friendly analytics service, to understand which features are used. A request to its collection endpoint may contain:

  • the page path (for example /text or /pdf) and the referring URL;
  • browser language and screen resolution;
  • the site hostname and a randomly generated, one-way hashed device identifier used to distinguish sessions.

It never contains file names, file contents, text you type or paste, folder structures, or any account information. We do not set advertising or tracking cookies, and we do not sell or share this data. Umami aggregates the numbers; its own policy governs the aggregated service data.

If your browser sends Do Not Track or Global Privacy Control, no request is made at all. You can also opt out at any time with the switch below — it is stored locally and takes effect immediately in every tab of this site.

4. Third parties

Static assets are served by our hosting/CDN provider (Cloudflare Pages). Beyond that and the analytics request described above, the site loads no third-party scripts, fonts, ads, or SDKs. There is no cross-site tracking on this site.

5. Children

This tool is not directed at children under 13, and we do not knowingly collect personal information from them.

6. Your choices

  • Opt out of anonymous statistics using the switch below.
  • Delete all locally stored data through your browser's "Clear site data" setting.
  • Use the tool offline after the page has loaded; comparison itself needs no network.

7. Changes and contact

If this policy changes materially, we will update the date above and the notice in the app. Questions about this policy can be sent to [email protected].

Stored only in this browser. Respects DNT / GPC automatically.