Markdown to PDF Converter Convert Markdown text to a formatted PDF document.

The tool works by using the `pdf-lib` library to generate PDF documents from Markdown-formatted text. It starts by parsing the Markdown input line-by-line, detecting various elements such as headings, list items, numbered lists, blockquotes, and code fences. Each element type is then styled with the appropriate font size, weight, and style using fonts embedded from `StandardFonts`. For example, headings are rendered in bold font with sizes of 24pt for H1, 19pt for H2, and 15pt for H3.

The tool uses a word-level line-breaking algorithm to wrap text at the optimal point. This is achieved through the `wrapText` function, which splits the input text into words and checks if adding each word to the current line would exceed the maximum allowed width. If it does, the function starts a new line with the current word. The `ensureSpace` function is used to check if there's enough space left on the current page for the next element, and if not, it adds a new page.

The tool also handles code blocks by rendering them in monospace font with a tinted background. It supports unordered lists by prefixing each item with a bullet character, and ordered lists by using the list item number as a prefix. The `FileReader` API is used to read the contents of uploaded Markdown files, and the `useState` hook from React is used to manage the tool's state, including the input Markdown text, font size, page size, and error messages.

The PDF document is generated asynchronously using the `generate` function, which creates a new `PDFDocument` instance and embeds the necessary fonts. The tool then iterates over the parsed Markdown elements, adding each one to the PDF document using the `drawText` and `drawRectangle` methods. Finally, the generated PDF document is saved to a file using the `save` method.