Why you should send PDFs instead of Word documents

What is PDF, exactly?

PDF stands for Portable Document Format. It was created by Adobe in the early 1990s with one goal: a document that looks exactly the same regardless of the software, operating system, or device used to open it.

In 2008, PDF became an open international standard — ISO 32000, maintained by the International Organization for Standardization. No single company owns it. It's a universal format by design, built to outlast any particular software.

1. What you see is what they get

This is the core problem with Word files: a .docx is not a finished document — it's a set of instructions that each application interprets differently. The same file can look completely different depending on the version of Microsoft Office, whether it's opened in LibreOffice or Google Docs, and which operating system is running.

Table columns that shift, page numbers that move, headers that disappear — these aren't rare edge cases. They happen regularly when you send a .docx to someone using a different setup. With a PDF, none of that is possible.

2. Fonts are embedded in the file

When you use a specific font in a Word document and send it, the recipient needs that font installed on their machine. If they don't have it, their software silently substitutes another — changing spacing, line height, and often breaking the layout entirely.

PDFs embed the fonts directly inside the file. The document carries everything it needs to render itself correctly, regardless of what's installed on the receiving end. A document designed with a specific typeface arrives exactly as intended.

3. The layout is frozen

In Word, a single small difference — a slightly different default margin, a different printer driver, a different page size — can cascade through the entire document. Footnotes shift. Images move. Page breaks land in the wrong place. A five-page document becomes six.

A PDF is a snapshot. It doesn't adapt to its environment. For any document where presentation and precision matter — a proposal, a CV, a legal contract — this is not a limitation, it's the entire point.

4. It signals that the document is final

Sending a contract or invoice as a .docx means the recipient can open it, change the numbers, and save it — whether intentionally or by accident. A PDF makes it immediately clear that the document is done. It's the digital equivalent of a printed page.

5. Word files carry hidden data

A .docx file is not just the text you see. It silently stores the author's name, the company name, revision history, tracked changes, and comments — including ones you thought you deleted. This has caused real-world embarrassment:

• Legal documents sent with visible tracked changes revealing negotiation positions
• Client proposals with internal comments ("is this price too high?") left in the file
• Corporate documents leaking employee names and internal tools via document metadata

A PDF exported from a clean document carries none of this. It's what you exported, nothing more.

6. No Office licence required

Every modern device can open a PDF natively: Windows, macOS, iOS, Android, and every browser. No app to install, no subscription required. Word documents require Microsoft Office or a compatible alternative — and those alternatives don't always render .docx files faithfully.

By sending a PDF, you remove a dependency from the recipient. They don't need anything beyond what they already have.

7. PDF is the right format for printing

Because a PDF is fixed, it prints exactly as it looks on screen — same margins, same page breaks, same layout, regardless of the printer or the OS print settings. With a .docx, the print result depends on how the document is rendered locally, which printer driver is active, and which paper format is set as default.

For anything that will be physically printed — a CV, a contract, a menu, a flyer, a presentation handout — PDF is the only format that guarantees what comes out of the printer matches what you designed. Print shops universally require PDF for exactly this reason.

8. You can still fill it in, sign it, and add initials

A common objection to PDF is that it can't be edited. This is no longer true. Modern PDF tools let you:

• Add form fields so the recipient can type directly into the document
• Insert a signature zone for electronic signing
• Add initial boxes (paraph) on each page
• Return the filled document by email — no printing, no scanning

A signed PDF returned by email has the same legal standing as a wet-ink signature in most jurisdictions — and creates a cleaner paper trail. Learn how to sign a PDF in our dedicated guide.

9. When .docx is still the right choice

PDF is the format for finished documents. .docx is the format for documents still being worked on. The rule is simple:

• Use .docx when collaborating — track changes, comments, and co-editing are Word's strengths
• Use .docx when sharing a template the recipient is expected to fill in and customise
• Use PDF for everything you consider final and ready to be read, signed, or printed

Conclusion

PDF is not just a convenient format — it's an ISO international standard built for permanence, portability, and precision. It eliminates rendering problems, protects your layout, hides nothing you didn't intend to share, and works on every device without any software requirement.

For CVs, contracts, invoices, proposals, and anything meant to be printed: always send PDF. Keep the .docx for your own working files.

Ready to start? Read our guide on how to create a PDF from any application.