These examples are deprecated. I have kept them for compatibility purposes. The new and totally documented API is located at https://parzibyte.me/http-esc-pos-desktop-docs/

Remember that, when printing from the browser, you must use https, localhost o 127.0.0.1. It won't work on sites without HTTPS nor localhost with a different port than 80 (which is the default ) nor IP. If you want to print on the local area network, check:How to print on a network printer
If the examples are not working, make sure that:

The plugin is running in the background. Download it from: https://parzibyte.me/http-esc-pos-desktop-docs/es/guia/descargar.html
Your printer is shared and has a friendly name as indicated in: https://parzibyte.me/blog/en/2019/10/13/how-to-share-printer-windows/

Define custom character

You cannot define more than one custom char (it is limited by the printer), but you can define many contained in only one. Please check: this video and this one for a possible fix

Printer

The character will be defined by using the next string:

Which character will be replaced by the custom one?

Width multiplier:

Height multiplier

Write a message and make sure it contains the replaced character

When printing, the result receipt should be as follows:

Definir e imprimir caracteres personalizados en impresora térmica

Proudly brought to you by Parzibyte. This site is open source. You can see the source code on GitHub