How the PDF to Word Converter Works
AnyTool PDF to Word reads a PDF entirely in the browser with pdf.js, whose worker is bundled into the app and served from the same origin — never loaded from a CDN — so the tool stays fully offline-capable and uploads nothing. A PDF stores no semantic document model, only positioned glyphs, so for each page the converter calls getTextContent() to obtain every text run with its position, font size, width and font name, and groups runs into paragraphs from vertical gaps and end-of-line markers. It tallies font-size frequency across the document to determine the body text size, then promotes lines that are about 1.8×, 1.4× or 1.15× larger (with bold weight considered) to Word Heading 1, 2 or 3 styles. Each run is emitted as a native Office Open XML (OOXML) TextRun with its bold/italic state, size and a mapped font family, and the assembled document is packed to a Blob with the docx library’s Packer and downloaded locally.
- Text read with pdf.js getTextContent() — position, font size, width, font name
- pdf.js worker bundled locally (pdf.worker.min.mjs?url) — no CDN
- Body font size detected by frequency; larger lines become Word headings
- Bold, italic, size and font family preserved as native OOXML run formatting
- Real .docx assembled with the docx library and Packer.toBlob() — nothing uploaded