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DOCX to PDF

Convert Microsoft Word .docx files to PDF in your browser via mammoth.js

About DOCX to PDF

DOCX to PDF converts Microsoft Word documents (.docx) into PDF files entirely inside your browser. The tool uses mammoth.js to extract semantic content (headings, paragraphs, lists, tables, bold/italic, blockquotes, hyperlinks, embedded images) and render it as clean HTML, then html2pdf converts the HTML to PDF via a jsPDF rendering pass. You see a live preview before downloading, can pick A4 or Letter page size, set margin in millimetres, and choose a quality preset (High, Medium, Fast) to trade rendering scale against output file size. Everything runs locally — your Word document never leaves the device. Right tool for converting a one-off .docx without opening Word. For pixel-perfect fidelity (custom fonts, complex layouts, headers/footers), Word's own export remains the gold standard.

Why use DOCX to PDF

100% Browser-Side

mammoth.js reads the .docx, html2pdf renders the PDF — no upload, no server roundtrip.

Live HTML Preview

See the converted output before committing to download — catch formatting issues early.

Page Size & Margin Control

A4 or Letter, with 0–40 mm margins for tight or generous layout.

Three Quality Presets

High (sharper, larger file), Medium (default), Fast (smaller, quicker render).

Preserves Semantic Structure

Headings, lists, tables, blockquotes, bold/italic, and hyperlinks all carry through.

No Account Required

Convert as many documents as you need without watermark, daily limit, or signup.

How to use DOCX to PDF

  1. Upload a .docx file — up to 30 MB, processed locally in your browser via mammoth.js.
  2. Wait a moment as mammoth extracts the content — a live HTML preview appears below the toolbar.
  3. Pick a page size (A4 or Letter), a margin in mm (0–40), and a quality preset.
  4. Click Toggle preview to hide the preview if you want a wider working area.
  5. When the preview looks right, click Download PDF — html2pdf renders and downloads the file.
  6. Open the result in any PDF reader to verify formatting before sharing or printing.

When to use DOCX to PDF

  • When you need to send a Word document to someone who does not have Word and you want them to see it exactly as written.
  • When archiving a draft, contract, or report as a non-editable PDF for compliance or record-keeping.
  • When emailing a CV, cover letter, or proposal as a PDF (most recruiters and ATS systems prefer PDF over DOCX).
  • When you receive a .docx attachment on a phone or tablet without Word and need to read or sign it as PDF.
  • When publishing a Word-authored chapter, blog post, or whitepaper to a CDN or document share that expects PDF.
  • When the source Word file is sensitive and you do not want to upload it to a third-party online converter.

Examples

CV / resume

Input: cv.docx (2 pages, headings + bullets), A4, 16mm margin, Medium quality

Output: cv.pdf — 2 pages, clean serif body, sans-serif headings, ready to attach to a job application

Project report

Input: report.docx (12 pages, tables + images), A4, 20mm margin, High quality

Output: report.pdf — 14 pages (slight content reflow), tables and images preserved, sharp text at zoom

Cover letter

Input: letter.docx (1 page, paragraphs only), Letter, 12mm margin, Fast quality

Output: letter.pdf — 1 page, small file size, ready to email

Tips

  • For best fidelity, ensure the .docx uses Word's built-in heading styles (H1, H2, H3) — mammoth maps these to semantic HTML.
  • Custom fonts inside Word are replaced with Georgia (serif body) and a sans-serif heading family — re-style in the source if exact fonts matter.
  • Embedded images carry through automatically — but very large images may slow the html2pdf render at High quality.
  • Headers, footers, and page numbers from Word are not preserved — html2pdf paginates by content height, not by Word's page model.
  • If a long table breaks awkwardly across pages, switch the table to Landscape orientation in Word first.

Frequently Asked Questions

Does this preserve custom fonts from Word?▾
No — custom fonts are not embedded. The tool uses a Georgia serif body and a sans-serif heading family for predictable rendering. For exact font fidelity, use Word's built-in File → Export → PDF.
What about Word headers, footers, and page numbers?▾
These are not preserved — mammoth strips them as part of the semantic-HTML conversion. If you need them in the PDF, add them in Word and use Word's own export.
Are tables, lists, and images converted?▾
Yes — tables, ordered/unordered lists, embedded images, hyperlinks, bold, italic, and blockquotes all carry through.
Can I convert .doc (legacy Word 97–2003)?▾
No — only .docx (XML-based, Word 2007+) is supported. Open the .doc in Word and Save As .docx first.
Is the document uploaded to your server?▾
Never. mammoth.js parses the .docx in your browser, html2pdf renders the PDF locally, and only the final download leaves the page.
Why does the page count differ from Word?▾
html2pdf paginates based on rendered content height, not Word's page-break model. Different fonts, margins, and image sizes cause slight reflow.
How big a .docx can I convert?▾
Up to 30 MB practically. Documents with many high-resolution images may slow High-quality rendering significantly — use Medium or Fast for big files.
Why does the preview look slightly different from the PDF?▾
The preview iframe uses your browser's CSS rendering directly, while html2pdf adds a paginated layout pass — small differences are normal, content is identical.

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Glossary

DOCX
Microsoft Word's modern XML-based file format (since Word 2007) — actually a ZIP archive containing XML files.
mammoth.js
Open-source JavaScript library that converts .docx files to clean semantic HTML — the input parser used by this tool.
html2pdf
Open-source JavaScript library that renders HTML to PDF using html2canvas and jsPDF under the hood — used here for output.
Semantic HTML
HTML that uses tags reflecting meaning (h1, ul, blockquote) rather than presentation — what mammoth produces from Word styles.
Pagination
Breaking content across multiple pages — html2pdf does this automatically based on content height, not Word's original page model.
Render Scale
How many pixels of bitmap are produced per CSS pixel during the html2canvas pass — High quality uses 2×, Fast uses 1×.