HTML to PDF Converter

1. What HTML to PDF Really Does

An HTML-to-PDF converter runs the same kind of rendering pipeline a browser does: it parses the markup, applies CSS rules, lays out the resulting tree, paints each page region as a bitmap or vector op, and outputs the byte stream as a PDF. The difference from a screen browser is the final step writes a paginated document instead of a scrollable viewport. Pages break at configurable boundaries, headers and footers repeat across pages, and hyperlinks are preserved so the resulting PDF still functions as a navigable document.

Because the conversion happens through a real rendering engine, the PDF preserves your CSS typography, your flexbox and grid layouts, your embedded images, and your SVG drawings. Anything you can render on screen, you can render to PDF.

2. Print Layout: Page Size, Margins, and Orientation

PDF output respects the page box model standard browsers expose via CSS at-rule @page. The supported page sizes are A4, A5, US Letter, US Legal, and US Tabloid. You set the margin around the page content to default 0.4 inch, or wider if you need a binding gutter or a more traditional book layout. Orientation is portrait or landscape, and you should pair landscape with wide content that benefits from horizontal space, such as spreadsheets or wide tables.

A subtle gotcha: HTML layout normally scrolls vertically and the entire document is one long page. PDF layout paginates, so an element that straddles a page boundary may get split awkwardly. You can add CSS page-break-inside: avoid on cards, code blocks, or images to keep them intact across pages.

3. Headers, Footers, and Page Numbers

The converter writes header and footer content on every page of the resulting PDF. Footers commonly include the page number, and the converter knows how to substitute template tokens like pageNumber and totalPages so you do not have to handcraft per-page footers. Headers can carry a document title, the current date, or any custom text you want repeated on every page. Set both, neither, or just one as you prefer.

4. When to Convert HTML to PDF

• Archiving a receipt or invoice. HTML receipts disappear when the session ends; a PDF you keep locally lasts forever.
• Distributing documents outside email HTML. A PDF you send to clients renders identically on every machine because the layout is frozen.
• Generating a printer-ready report. A long dashboard laid out in HTML converts to a paginated PDF that prints cleanly with page numbers and headers.