Convert .docx Word documents to PDF in your browser. Best-effort text conversion — preserves headings, bold, italic, and lists. Free, no upload, no watermark.
Convert modern Microsoft Word documents (.docx) to PDF entirely in your browser. The tool parses the .docx file using <strong>mammoth.js</strong> (which extracts the document's structured content into HTML), then renders the result onto an A4 PDF using <strong>pdf-lib</strong> with proper word-wrap, headings (H1–H3), bold, italic, and bulleted / numbered lists. <strong>Best-effort, text-focused</strong>: the converter is excellent for memos, letters, simple reports, articles, school assignments, and any text-driven document. It does <em>not</em> render tables, images, footnotes, headers / footers, custom fonts, multi-column layouts, or equations — for those, use Microsoft Word's built-in "Save as PDF" or LibreOffice. The advantage of this tool is that it never uploads your document to a server, so it is the safe choice when the .docx contains anything sensitive.
The conversion runs in three stages, all inside your browser tab:
The whole process runs locally in your browser tab. The .docx never reaches a server, no API call leaves your device, no telemetry is collected. The only network request the tool makes is the initial download of the JavaScript libraries (mammoth + pdf-lib, about 2 MB combined), which is cached after the first visit.
Three rough categories of Word→PDF conversion:
One useful workflow: draft a sensitive document in Word, save as .docx, run through this tool to get a quick private PDF for a first review, then later use Word's "Save as PDF" once you are ready to share the final version with full formatting.
| Element | Status | Notes |
|---|---|---|
| Paragraph text | ✅ Full | Word-wrapped to A4 width |
| H1 / H2 / H3 headings | ✅ Full | Sized 22 / 18 / 14 pt, bold |
| Bold and italic | ✅ Full | Switches to Helvetica variants |
| Bulleted lists | ✅ Full | Bullet character, indented |
| Numbered lists | ✅ Full | 1. 2. 3. style, indented |
| Tables | ❌ Dropped | Use Word's native export |
| Embedded images | ❌ Dropped | Use Word's native export |
| Footnotes / endnotes | ❌ Dropped | Body text only |
| Headers and footers | ❌ Dropped | Body text only |
| Custom fonts | ⚠️ Substituted | Renders in Helvetica |
| Multi-column layouts | ❌ Single column | Reflowed to one column |
| Equations | ❌ Dropped | Use MathML / LaTeX export |
| Comments / track changes | ❌ Dropped | Final-state text only |
If your document is mostly the supported elements with occasional unsupported elements, the conversion will still produce useful output — the unsupported parts simply will not appear, with parser notes flagging where they were dropped.
Word documents are often the most private files in a person's computer — drafts of contracts, internal memos, NDAs in progress, salary negotiations, client briefs, legal correspondence, performance reviews. Sending these to a server for free conversion exposes them to whatever the operator chooses to do with them: log, retain, train models on, sell, hand over to authorities.
This tool never sees your file. The .docx loads into your browser, mammoth.js parses it locally, pdf-lib renders the result locally, and the PDF downloads from your browser to your downloads folder — without ever crossing the network. You can verify this by opening DevTools, switching to the Network panel, and watching what happens when you upload and convert: zero outbound requests for your file, only the initial library bundle (which is the same on every conversion). For sensitive .docx files, this is the only safe free option on the open web.
The legacy .doc format is a binary blob from the 1990s with no open specification — parsing it requires reverse-engineered libraries that have severe security and reliability issues. The modern .docx format (introduced in Word 2007) is an open ZIP-based XML format that mammoth.js can parse cleanly. To convert a .doc, open it in Word or LibreOffice and re-save as .docx, then convert.
Browser-based .docx → PDF conversion does not have access to Microsoft's rendering engine, so the output is not pixel-identical to what Word would produce. The tool reliably handles: paragraph text, H1 / H2 / H3 headings, bold, italic, bulleted lists, and numbered lists. It does NOT handle: tables, embedded images, footnotes / endnotes, headers and footers, custom fonts, page breaks, multi-column layouts, equations, or comments. For documents that need those features, use Word or LibreOffice — they have full access to the original rendering pipeline.
Word's built-in PDF export uses Microsoft's actual rendering engine, so it produces a pixel-perfect PDF. This tool produces a simpler, text-focused PDF using a different rendering pipeline. The advantages of this tool: no Microsoft Word required, no LibreOffice install, no upload to a third-party server, instant in-browser conversion. The disadvantage: lower fidelity for complex documents. If you have Word, use Word. If you do not, this tool is the next-best free, private, no-install option.
No. The .docx is parsed in your browser by mammoth.js, the resulting HTML is rendered to PDF by pdf-lib, and the output downloads from your browser tab. Open your network inspector while converting — there are no upload requests. Your document never leaves your device. This makes the tool safe for confidential drafts, contracts, NDAs, internal memos, and any document you would not normally upload to an unknown server.
Up to 50 MB. The conversion runs in browser memory; very large documents (100+ MB / 1000+ pages) may exceed memory limits on phones and crash the browser tab. For most office documents (memos, letters, reports under 50 pages), conversion completes in 1-3 seconds.
mammoth.js logs warnings when it encounters elements it cannot fully translate (custom styles, embedded objects, complex shapes). These notes are informational — the conversion still completes, but those specific elements will not appear in the PDF. If the notes mention "image" or "table", expect to see those elements missing from the output.
Yes. The text is rendered as actual text strings using standard PDF fonts (Helvetica), not as page images. Every character is selectable, copyable, and indexed by search engines. This is a key advantage over image-based "PDF" outputs — your document remains fully searchable.
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