Convert Word to PDF Free — With Preview
🔑 Key Facts
- Cost: 100% free, no registration, no watermark.
- Supported input: .docx (Word 2007+). Legacy .doc/.rtf/.odt are not reliably supported.
- Privacy: Fully client-side — your file is never uploaded to any server.
- Preview: Live paginated document preview before conversion, plus a page-accurate PDF preview before download.
- Pagination: Element-aware — images and table rows are never split across pages.
- File size limit: 25 MB.
Quick answer: Upload a .docx file and Mammoth.js decodes it into structured HTML directly in your browser. A pagination engine measures every heading, paragraph, image, and table row, and lays them out into page-sized "sheets" without ever cutting an element across a page break. You get a live preview of those sheets immediately. When you click Convert, the very same sheets are captured with html2canvas and assembled into a real PDF with jsPDF — and the resulting page images are shown back to you as a PDF preview before you download.
📄 Only modern .docx files (Word 2007 or newer) are reliably supported. Re-save older .doc/.rtf/.odt files as .docx first.
🖼️ Images and tables are automatically paginated so they're never cut in half across a page.
👀 You'll see a document preview before converting, and a PDF preview before downloading.
✅ Nothing is uploaded — all parsing, rendering, and conversion happens locally in your browser.
Note: Your file exists only in your browser's memory. Closing this tab removes it completely — nothing is stored on any server.
Documentation: Word to PDF Converter – User Manual
How to Convert Word Documents to PDF (With Preview)
Upload Document
Click "Select Word Document" or drag and drop your .docx file into the upload area.
Preview & Adjust
Review the live, paginated document preview and choose orientation, page size, and quality.
Convert & Verify
Click "Convert to PDF" and check the page-accurate PDF preview before deciding to download.
Download
Click "Download PDF" to save the file, or "Convert Another" to start over.
✨ Why This Converter Is Different
Most browser-based Word-to-PDF tools capture your document as one long screenshot and slice it at arbitrary pixel intervals — which is exactly why images and tables often get cut in half. This tool measures your content first and paginates it intelligently, so you get a genuinely accurate preview before converting, and a matching PDF preview before downloading.
Reports & Proposals
Turn business reports and client proposals into polished, non-editable PDFs — verified with a preview before you send them.
Academic Assignments
Submit essays and assignments as PDFs, checking pagination is clean before submission.
Resumes & Cover Letters
Confirm your resume's layout looks identical on every device before sharing it with recruiters.
Contracts & Legal Docs
Convert agreements to PDF and verify tables and clauses aren't split awkwardly across pages.
Archiving Documents
Store Word files in a long-term, widely supported PDF format with confidence in the layout.
Privacy-Sensitive Files
Convert confidential documents without uploading them to a third-party cloud service.
Why Choose Our Word to PDF Converter?
Live Document Preview
See exactly how your content will paginate before you even click Convert.
Smart Pagination
Images and table rows are never split across a page break.
PDF Preview Before Download
Verify the exact, final PDF pages before you save the file.
100% Secure
All processing happens in your browser. Your documents never leave your device.
Cross-Platform
Works on Windows, Mac, Linux, iOS, and Android — no installation required.
Completely Free
No registration, no watermarks, no hidden fees.
Supported Word Document Formats
Benefits of Converting Word to PDF
🔒 Document Security
PDFs prevent unauthorized editing or content changes.
📱 Universal Compatibility
PDF files open on any device without needing specific software.
📄 Professional Presentation
Consistent formatting and layout across every platform.
📤 Easy Sharing
Smaller, universally compatible files that are easy to distribute.
Word to PDF Converter – Complete Guide
Converting a Word document to PDF traditionally meant installing Office, using a print-to-PDF driver, or trusting an unfamiliar website with your files — and even then, you couldn't verify the result until after it was created. This tool solves both problems: it renders your document as a PDF entirely inside your browser, and shows you an accurate preview at two separate points in the process, before you commit to downloading anything.
How This Converter Actually Works
When you upload a .docx file, its bytes are read via the File API and handed to Mammoth.js, which decodes the document's Open XML structure into semantic HTML — preserving headings, paragraphs, lists, tables, formatting, and embedding any images directly as base64 data URIs. That HTML is placed into a hidden, precisely-sized measuring container matching your chosen page size and orientation. A pagination engine then walks through every top-level block element, measuring its rendered height, and decides which page it belongs to — starting a new page only between elements, never through the middle of one. Images are automatically constrained to fit within a single page's content area, and any table taller than a page is split row-by-row, repeating the header row on each new page fragment. The resulting "page sheets" are what you see in the live preview. When you click Convert, those exact same sheets are captured with html2canvas at your selected quality level and compiled into a real PDF document with jsPDF — and the very same captured page images are shown back to you as the PDF preview.
Conversion Options Explained
| Option | What It Controls | Recommendation |
|---|---|---|
| Page Orientation | Portrait or Landscape layout of each PDF page | Use Landscape for wide tables pasted into Word |
| Page Size | A4, Letter, Legal, or A3 dimensions | Match your region's standard (A4 worldwide, Letter in the US) |
| Quality | Resolution and compression used when capturing each page | Use High for documents with detailed images or fine print |
| Preserve Formatting | Whether headings, bold, and italics keep their visual styling | Keep enabled for the most faithful conversion |
Format Compatibility Details
| Format | Compatibility | Notes |
|---|---|---|
| DOCX | Excellent | Native support via Mammoth.js — headings, tables, images, and lists convert cleanly |
| DOC (legacy) | Not supported | Older binary format — re-save as .docx |
| RTF / ODT | Not supported | Convert to .docx in Word or LibreOffice before uploading |
Security and Privacy Considerations
- Zero Network Transfer: Your document is read directly into browser memory via the File API and never transmitted over the network.
- No Server-Side Processing: Parsing, pagination, rendering, and PDF assembly all happen client-side in JavaScript.
- No File Storage: The converted PDF exists only as an in-memory blob until you download it.
- Session Isolation: Closing the tab clears all file data, canvases, and previews instantly.
Troubleshooting Common Issues
Yes. This version measures every element's height before laying out pages and only breaks between elements. Images are also constrained to fit within a single page, and tall tables are split row-by-row with the header repeated.
Mammoth.js only reliably parses the modern .docx format. Open the file in Word (or LibreOffice) and use "Save As → Word Document (.docx)", then upload the resaved file.
Select "High Quality" in Conversion Settings before converting — this increases the capture resolution used for each page.
The file may be corrupted, password-protected, or not a genuine .docx. Confirm it opens normally in Word, remove any password protection, and confirm it's under 25MB.
Best Practices for Successful Conversion
- Always Use .docx: Re-save older files in the modern format before uploading.
- Check the Live Preview First: Review pagination in Step 2 before converting.
- Verify the PDF Preview: Always check the Step 3 preview before downloading.
- Choose High Quality for Images: If your document contains photos or diagrams.
- Keep the Original File: This tool produces a new PDF — always retain your source document.
Frequently Asked Technical Questions
Question 1: How does the pagination algorithm avoid cutting images or table rows?
Answer: Every top-level block element is measured in a hidden container using getBoundingClientRect() before any rendering happens. The algorithm accumulates element heights and only starts a new page between elements. Images additionally get a CSS max-height clamp equal to one page's content area, and tables taller than one page are split at row boundaries, with the header row cloned onto each fragment.
Question 2: Why is the document preview guaranteed to match the final PDF?
Answer: The same "page sheet" DOM elements built for the live preview are kept in an offscreen container and passed directly to html2canvas during conversion. The resulting canvases become both the PDF page images and the on-screen PDF preview.
Question 3: Why does the tool require .docx instead of also parsing .doc?
Answer: Mammoth.js is built to parse the Open XML (.docx) format's structured XML. The legacy .doc format is a proprietary binary structure that isn't reliably parseable with a lightweight client-side library.
Question 4: How is image data embedded without uploading anything?
Answer: Mammoth.js is configured with a custom image handler that reads each embedded image's bytes and base64-encodes them into a data: URI directly in the generated HTML.
Question 5: Does this tool modify my original Word document?
Answer: No. Your original file is only read to extract content; the tool produces a brand-new PDF file as output.
Question 6: Can I convert a password-protected document?
Answer: No. Mammoth.js cannot decode an encrypted DOCX file's content. Remove password protection in Word first.
Tips for Best Results
- Save as .docx: Convert older .doc, .rtf, or .odt files to .docx before uploading.
- Use Standard Fonts: Common fonts render most consistently.
- Watch the Live Preview: Adjust page size/orientation until pagination looks right.
- High-Resolution Images: Produce sharper results, especially at High Quality.
- Double-Check the PDF Preview: Always review Step 3 before downloading.
Frequently Asked Questions
Yes, 100% free with no registration, watermarks, or hidden fees.
Yes. As soon as you upload a .docx file, a live, paginated preview shows exactly how your content will be laid out, before you click Convert.
Yes. After converting, a page-accurate preview of the generated PDF is shown, built from the exact same rendered pages used to create the file.
This tool uses Mammoth.js, which reads the modern Open XML (.docx) format. Legacy .doc, .rtf, and .odt files aren't reliably supported client-side.
No. An element-aware pagination algorithm measures every element before rendering and only breaks between elements.
Yes. Everything happens locally in your browser using Mammoth.js, html2canvas, and jsPDF.
Uploads are supported up to 25 MB.
Remove the password protection in Word first, then upload and convert the file here.
Yes, the tool is fully responsive and works on Android and iOS mobile browsers.
Final Thoughts
Converting Word to PDF shouldn't be a guessing game. This tool paginates your document intelligently so images and tables are never split awkwardly, shows you exactly what to expect before you convert, and lets you verify the finished PDF page-by-page before you ever click download.
Upload your Word document above to start converting now!