PDF and DOCX FAQ: Answers to the Most Common Questions

PDF stands for Portable Document Format. It was developed by Adobe and first released in 1993. Adobe made it an open standard in 2008, which is why it can be opened by any PDF viewer today without licensing restrictions.

PDF was architecturally designed for viewing and sharing, not editing. It stores content as precisely positioned elements on a fixed page — not as flowing editable text. Editing a PDF requires specialized software like Adobe Acrobat Pro, or converting it to an editable format like DOCX first.

If fonts aren't embedded in the PDF, different devices substitute their own fonts — which have different character spacing, causing text to reflow and layouts to shift. Well-made PDFs embed all fonts and look identical everywhere. If your PDF looks inconsistent across devices, re-export it from the source application with font embedding enabled.

If the PDF was created from a digital document (Word, InDesign, etc.), yes — text is selectable and copyable. If the PDF is a scan of a physical document, the pages are images and the text isn't selectable without OCR processing.

PDF file size is almost entirely determined by embedded images. A text-only PDF is tiny. A PDF with many high-resolution photos can be enormous. To reduce size, re-export using a web or screen quality preset, or use DigiToolzHub's Compress PDF tool.

PDFs support strong encryption (AES-256) for open password protection — this is genuine security. Permission restrictions (preventing copying or printing) are largely ineffective and easily bypassed by free tools. For sensitive documents, use open password encryption rather than permission restrictions.

Technically yes — PDFs can contain JavaScript and embedded files that could be malicious. PDFs from trusted sources are safe. Be cautious opening PDFs from unknown senders, especially if your PDF viewer prompts you to enable JavaScript or run embedded content.

PDF/A is an archival standard that requires all fonts to be embedded, prohibits encryption, and disables JavaScript. It's designed for long-term document preservation — government agencies and legal records often require PDF/A. Standard PDF is more flexible but less guaranteed for future compatibility.

Yes. On Mac, Preview can add password protection (File → Export as PDF → Security Options). LibreOffice can export password-protected PDFs for free on any platform.

DOCX is Microsoft's Office Open XML document format. The X refers to XML — the file is actually a ZIP archive containing XML files and assets. It replaced the older binary .doc format with Microsoft Office 2007.

DOC is the older binary format used through Word 2003. DOCX is the newer XML-based format used from Word 2007 onward. DOCX files are smaller, more compatible with non-Microsoft software, and easier to recover if corrupted. There's rarely a reason to use DOC over DOCX today.

Yes. Google Docs, LibreOffice Writer, Apple Pages, and WPS Office all open DOCX files. Formatting fidelity varies — simple documents usually transfer well, complex formatting may shift slightly in non-Word applications.

The most common cause is font differences. If your document uses fonts the recipient doesn't have installed, their word processor substitutes the closest available font — which has different character spacing and causes text to reflow. Converting to PDF before sharing eliminates this problem entirely.

Track Changes records every edit made to a document — insertions, deletions, and formatting changes — with the editor's name and timestamp. It's invaluable for collaborative review workflows. Importantly, Track Changes history remains in the file even when changes are hidden. Always accept or reject all changes and delete comments before sharing a DOCX externally to avoid unintentionally revealing edit history.

DOCX files can contain hidden data — Track Changes history, deleted content, author names, and revision history — that may reveal information you didn't intend to share. Run Document Inspector (File → Info → Check for Issues) before sharing sensitive DOCX files. Converting to PDF strips this metadata and produces a cleaner shareable file.

DOCM is a macro-enabled Word document. Macros are small programs that can automate tasks — but they can also be used maliciously. DOCX files cannot contain active macros, which makes them safer to open from unknown sources. Only enable macros in DOCM files from sources you completely trust.

Use PDF when the document is final and shouldn't be modified, when consistent appearance across devices matters, for formal submissions (resumes, contracts, applications), for printing, and for any document requiring digital signatures.

Use DOCX when the document needs to be edited, when you're collaborating with others using track changes, when the document will be updated regularly, or when you need mail merge or other word processor features.

For simple text-based PDFs, conversion is usually accurate with minor cleanup needed. For complex layouts, multiple columns, tables, and scanned documents, significant manual adjustment after conversion is normal. The quality of PDF to DOCX conversion depends heavily on the complexity of the source PDF.

PDF, always. Your resume needs to look exactly as you designed it on every device and in every applicant tracking system. A DOCX resume risks looking completely different on the recipient's screen due to font substitution and formatting differences. Convert to PDF before submitting every time.

Formatting is preserved extremely well. What you lose: editability, Track Changes history, comments, and some interactive elements. For a final document you're sharing rather than editing, none of these losses matter. The PDF will look exactly like your Word document.