Word to PDF Converter
Turn a .docx file into a paginated PDF with a live preview, custom margins, headers, footers, and page numbers. Headings, formatting, tables, and images convert automatically, all in your browser.
Click or drop a Word document
DOCX only (save .doc as .docx in Word first) · processed on your device, never uploaded
How this Word to PDF converter renders a document instead of translating one
Converting .docx, an OOXML package defined by ECMA-376, into PDF, defined by ISO 32000, is not a matter of remapping tags one to one. The two formats model a document completely differently: OOXML describes semantic structure like paragraphs and styles, while PDF describes an exact visual canvas of positioned marks. This tool bridges that gap by first turning your document into real HTML, then literally rendering that HTML to a canvas and stamping the canvas into PDF pages, which is why what you see in the preview is exactly what ends up in the file.
Two libraries do the work, both running in your browser. mammoth.js reads the .docx file and converts it to semantic HTML. html2pdf.js, which wraps html2canvas and jsPDF, then renders that HTML and paginates it into a downloadable PDF. Your document is parsed and rendered locally; nothing is uploaded to a server at any point.
From .docx to PDF in two rendering passes
<h1> rather than plain text.
html2canvas, which paints it pixel by pixel onto an off-screen canvas at a scale factor you control through the quality setting.
jsPDF slices that rendered canvas into pages sized to your chosen page format and orientation, honoring CSS page-break rules, and html2pdf triggers the final .pdf download.
| Setting | What it controls |
|---|---|
| Page size | Passed straight to jsPDF’s format option, e.g. A4 or Letter |
| Orientation | Portrait or landscape page geometry |
| Margin | Millimeters of blank space html2pdf reserves on every page edge |
| Quality | The html2canvas render scale; higher values produce sharper text at a larger file size and slower render |
.docx package, not the old binary Word 97-2003 .doc format, which is a completely different file structure. The tool checks the file extension up front and asks you to re-save the file as .docx in Word first, rather than attempting a conversion that would fail partway through.Two rendering details that matter
The source element must stay unstyled
html2pdf clones whatever node you give it into its own container attached to the page body and sizes that container itself. Positioning the source off-screen or forcing a manual width fights that sizing logic and produces blank or clipped pages, so the tool hands it a plain detached div instead.
Trailing empty paragraphs are stripped
Before rendering, the tool walks backward from the end of the converted document and removes trailing empty paragraph, line break or div elements that contain no text, image or table. Leaving them in is a common cause of an unwanted blank final page in the PDF output.
Format specifications and converters
- ECMA-376, the Office Open XML standard defining the
.docxstructure mammoth.js reads. - mammoth.js documentation, including its style map syntax for controlling how Word styles convert to HTML.
- html2canvas documentation, the library that rasterizes the converted HTML onto a canvas before pagination.
- jsPDF documentation, the library assembling the final paginated PDF file.
- ISO 32000-2, the PDF specification the exported file conforms to.
When a document needs to be final
Turning a resume or cover letter into a PDF that renders identically on every device before submitting it, locking a contract or proposal into a format the recipient cannot easily edit, preparing a report for print with a fixed page size and margins, and archiving a Word document in a format that won’t shift when opened in a different word processor years later. PDF’s fixed canvas nature is exactly what makes it the safer choice once a document is finished and ready to share.
Frequently Asked Questions
No, the entire conversion happens locally in your browser using JavaScript libraries loaded once from a CDN; your actual document content is never sent to any server. This makes the tool suitable for reasonably sensitive documents, though for highly confidential files, always follow your organization’s own document handling policy regardless of the tool used.
The .docx format (used since Word 2007) is an open, well-documented ZIP-based XML format that browser-based libraries can parse directly. The older .doc format is a proprietary binary format that’s far more complex to parse without a dedicated Word engine, if you have an old .doc file, open it in Word, Google Docs, or LibreOffice and use Save As to convert it to .docx first, then upload that.
Most common formatting, headings, paragraphs, bold and italic text, bullet and numbered lists, tables, and inline images, converts cleanly. However, since conversion goes through an HTML intermediate step rather than using Word’s native rendering engine, precise elements like custom headers and footers, footnotes, exact font substitutions, columns, and complex table layouts may shift slightly or not carry over. For documents built from standard elements, results are typically very close to the original.
No, password-protected or encrypted .docx files can’t be read by the browser-based conversion library, you’ll need to remove the password protection in Word first (File > Protect Document > Encrypt with Password, then clear the password field) before uploading it here.
There’s no hard limit built into the tool, since everything processes locally in your browser’s memory rather than through a server upload quota. Very large documents (hundreds of pages or many high-resolution embedded images) may take longer to render and generate, and could strain memory on lower-powered devices, but typical documents of a few dozen pages convert in a few seconds.
Mammoth.js converts standard inline images embedded in the document body, but images inserted as floating objects, watermarks, or placed in headers and footers may not be extracted. Similarly, unusual special characters or symbols from certain fonts can occasionally render differently since the PDF uses standard web fonts rather than the exact font installed when the document was created.
Use A4 (210 × 297mm) if your document was created for an international or European audience, or Letter (8.5 × 11 inches) if it was created for a US audience, since these are the two dominant paper size standards worldwide and mismatching them can cause text to reflow or margins to look uneven. Legal size is mainly used for certain US legal and government documents that require extra length.
Standard PDF files are not natively editable text documents; once downloaded, you’ll need a dedicated PDF editor (or convert it back to Word) to make changes. If you expect to keep editing the content, keep working in the original .docx file and only convert to PDF as your final distribution step.