Xuân Hiếu1S

This site does not track you.

1s.xuanhieu.org sets no cookies, runs no analytics and collects no data about you. The only thing stored on your device is your light or dark theme choice.

What this site stores on your device

Exactly one thing: your light or dark theme choice, kept in the browser's localStorage under the key xh-theme. The value is auto, light or dark.

Nothing else is stored. No cookies, no identifiers, no reader profile.

To clear it, open your browser's site settings and delete site data for 1s.xuanhieu.org. The site keeps working; it just opens in the default dark theme again.

What this site does not do

  • No cookies from this site. The site's own code sets none.
  • No analytics. No page views counted, no time on page measured, no in-page journey recorded.
  • No ads, no third-party tracking. Nothing embedded here follows you.
  • No data-collecting forms. There is no input on this site that sends your content to a server. Contact buttons open your own mail app and write straight to me.
  • No accounts, no sign-in. Nothing here requires logging in.

What the server records

The server that delivers this site keeps a standard access log: timestamp, IP address, path, and the browser information every HTTP request carries. That is ordinary operation, not a tracking feature built for this site.

I do not use that log to identify anyone, do not combine it with other data, and do not build reader profiles from it.

Fonts

The type on this site is served from this domain. Your browser makes no request to an external font service, so no third party sees that you read this page for the sake of a font.

Both families — Be Vietnam Pro and JetBrains Mono — are released under the SIL Open Font License 1.1. The licence files sit next to the font files on this site: Be Vietnam Pro and JetBrains Mono.

The products are a separate matter

The page you are reading is a showcase. Each product handles data its own way, and every product page here carries a section stating where your data goes:

  • 1xQuickConvertFormat converts files on your Mac; files are never uploaded. Full policy.
  • Bình Dân Học Vụ Số Pro stores settings in your browser. To issue and check licences it sends a random device id, the open course id and the licence key to 1x.xuanhieu.org; the purchase page collects an email address to send you the key. Answers and learning progress are not sent. Full privacy policy.
  • Xuan Hieu Learning Note keeps notes and API keys in the browser's storage; text you send to AI goes directly to the provider you pick. Privacy policy.
  • Save Image as JPG, PNG, WebP converts images with the browser's own engine; images never leave your machine. Details on the product page.

Contact

Questions about privacy, or you believe this site does something other than what is written above? Write to me. The person reading the mail is the person who wrote this page.

Last updated: 2026-10-20.