What is inside a DOCX or XLSX file?
A .docx, .xlsx or .pptx file is a ZIP package of XML parts defined by ECMA-376 / ISO/IEC 29500 (Office Open XML): document text and styles, worksheets and shared strings, slides and layouts, plus relationships, media and a core-properties part with author, dates and revision metadata. That is why such files can be read, previewed and converted in the browser without Office installed — and why their metadata deserves a look before they are shared.
How to use Word to PDF
- Drop one or more .docx files.
- Pick Text (searchable) or Layout (page images) mode.
- Adjust the page options if you like.
- Click "Convert to PDF" and download.
Word to PDF features
- Text mode: searchable PDF with embedded Cairo / Noto Devanagari fonts
- Layout mode: pages drawn as your browser renders them, saved as images
- Headings, lists, tables, bold, italic, links and images kept in text mode
- Word’s own page breaks honoured in layout mode
- Paper size, orientation, font size, margins and direction
- Several .docx files at once — one PDF each
- Nothing uploaded
Word to PDF example
A 3-page cover letter in Arabic
Input:
letter.docx, Text mode, A4Output:
letter.pdf — 3 pages, right-to-left paragraphs shaped in Cairo, selectable text, 60 KBFrequently asked questions about Word to PDF
Which mode should I choose?
Text mode when you need a searchable, small PDF and the exact page breaks do not matter (reports, letters, CVs). Layout mode when the visual appearance matters more than selectable text (a formatted flyer or a form you only need to print).
Why does the page count differ from Word?
Text mode typesets the content with its own fonts and margins, so lines and pages break in different places. Layout mode follows Word’s own page breaks when the file was saved by Word; documents from other apps are paginated by the height of their content.
Are fonts, images and tables kept?
Text mode embeds its own fonts (Cairo for Arabic and Latin, Noto Sans Devanagari for Hindi) and keeps bold, italic, headings, lists, tables and PNG/JPEG images; EMF/WMF drawings are dropped. Layout mode uses whatever fonts your device has, so a missing font is substituted.
Does it support .doc files?
No — only .docx (Word 2007 and later). Open a .doc in Word or LibreOffice and save it as .docx first.
Is my PDF uploaded to a server?
No. The file is opened and processed by your browser with WebAssembly and JavaScript; nothing is sent to Mutqan Soft or anyone else. Close the tab and the file is gone. Downloading the result needs a free account — no subscription, no payment.
What are the size limits?
Up to 250 MB and 2,000 pages per operation on a desktop browser, 60 MB and 500 pages on a phone, because everything runs in your device’s memory. The tool tells you before it starts if a file is over the limit.
Technical notes
Text mode: mammoth converts the document to semantic HTML (style map for Title/Heading/Quote/Code), DOMPurify sanitises it, the HTML mapper produces blocks and the layout engine typesets them in the worker with pdf-lib + fontkit and a UAX #9-style bidi ordering. Layout mode: docx-preview renders the pages, an in-house paginator splits sections that overflow the page height at block and table-row boundaries, each page is serialised into an SVG foreignObject, drawn onto a canvas at the chosen dpi, JPEG-encoded and written as an image page. A feature probe checks that the browser lets the canvas be read back; otherwise the mode is refused with a clear message.
References
- ECMA-376: Office Open XML file formatsThe .docx / .xlsx / .pptx container and markup: a ZIP package of XML parts (WordprocessingML, SpreadsheetML, PresentationML).
- ISO 32000-2:2020 — Document management — Portable document format — Part 2: PDF 2.0The current PDF standard: file structure, objects, pages, fonts, annotations, forms and encryption.