A zat is… a short permalink for QR codes

URI schemes

• https://l.zat.is/https://srv.us: creates and returns a relatively short link (https://zat.is/.${base32(sha256(url)[:16])}) for https://srv.us.

• https://qr.zat.is/txt~https://srv.us: makes a QR code instead, in textual form (your mileage may vary based on the font and spacing, maybe angle the camera to square the rectangle);

• https://qr.zat.is/gif~https://srv.us: now in GIF;

  

• https://qr.zat.is/png~https://srv.us: now in PNG;

  

• https://qr.zat.is/png10~https://srv.us: now scaled up to 5 pixels per block;

  

• https://qr.zat.is/png5.008~https://srv.us: now in blue (colors can be of the form RGB or RGBA or RRGGBB or RRGGBBAA);

  

• https://qr.zat.is/png5.008.ff08~https://srv.us: now over partly transparent yellow;

  

• https://qr.zat.is/png5~https://…/QR_code%23Design: linking to a URL containing an anchor; while we do our best to avoid escaping, it is specifically required for # so the full URL is transmitted to our server.

  

Usage

• The Link header indicates the URL appearing in the QR code.
• The To header indicates where the URL redirects to.
• The default size of 1 pixel per block works great when the image is scaled properly, for example:

<img
  src="https://qr.zat.is/gif~https://srv.us"
  style="image-rendering:pixelated; width:100%"/>