A (b, zero, zero, k) is a digital document that can contain chapters with text, images, lists, tables, slides, math formulas et cetera. It can be used (for example) as a college book containing knowlegde, presentation slides, exercise assignments and flash cards. All in one document!

The output file is a single HTML file (with no dependencies, including font data) that can be read in every (major) browser on a computer, tablet or other mobile device.

It's source is written in plain text, for example in a Markdown editor or directly inside this app. And because a lot of the syntax is related to Markdown, editing will be a piece of cake.

Features of this app include:

• Structure: title, chapter, sub-chapter, print, hidden chapter
• Text style: emphasize, bold, strike through, mark, positive/negative/question, dimmed, inline math, code, newline, color, size, font familiy, alignment
• Inline elements: internal link, external link, reference figure/table, citation, footnote, image bitmap/vector, icon (more than 2000 included), symbol/emoticon
• Block elements: paragraph, math, sorted/unsorted list, check list, table, blockquote, box, sticker, figure, code block, table of contents, columns, folded block, scripting block
• Parameters: parametrized value, parametrized block, argument, calculation, unit
• Special code blocks: slide, sub slide, flashcard, exercise, tabulair data (csv), jsvg drawing, mermaid diagram
• Export options: save source code to file (plain text or encrypted text), export to html, export to plain html, print (to pdf)
• Import options: load from file, paste input code
• Interactive options: show slide show, practice flashcards, increase/decrease font size, toggle light/dark theme, responsive layout
• Editing options: save to local storage, image/asset manager, view icons, view colors, view symbols, view LaTeX math examples, view cheat sheet, word wrap

respects your privacy and is committed to protecting your personal data.

This application does not collect any personal data or usage statistics. The data is not shared with any third parties. doesn't use cookies. All the processing is done in your browser and no data is sent to any server. doesn't store any of your content on the server. Only when data has been modified in editor all source data is stored locally in your browser's local storage (to prevent data loss when the browser window is coincidentally closed/refreshed). When closing the document, the browser's local storage will be deleted.