"Send it as a PDF" and "send me the Word file" sound like the same request, but they mean different things. One asks for a finished document; the other asks for something the other person can change. Picking the wrong one causes real problems — a CV whose formatting breaks on the recruiter's laptop, or a contract nobody can edit before signing.
The Core Difference
A Word document (.docx) stores text and formatting instructions. Every time it opens, the software lays the page out again, which is why it can look different on another computer with different fonts, margins or a different version of Word.
A PDF stores the finished page. Text and images are fixed in place, so it looks identical everywhere. That stability is its strength, and also its limitation: it is not meant for heavy editing.
Side-by-Side Comparison
| Question | Word (.docx) | |
|---|---|---|
| Looks the same on every device? | Not always | Yes |
| Easy to edit the text? | Yes | Limited |
| Opens without extra software? | Needs Word or a compatible app | Any browser |
| Good for printing? | Usually | Best |
| Can be password-protected? | Yes | Yes |
| Fillable forms and signatures? | Basic | Strong support |
When to Choose Word
- The document is still a draft and others need to comment or edit.
- A teacher or editor asked for a file they can mark up with tracked changes.
- A company wants to insert your details into its own template.
- You are handing over content that someone will rewrite, like website copy.
When to Choose PDF
- CVs and cover letters, unless the job ad says otherwise.
- Final assignments and theses submitted through a portal.
- Invoices, quotations and receipts.
- Contracts and agreements ready for signature.
- Forms you have completed and are returning.
- Anything that will be printed or archived.
Converting Between the Two
Going from Word to PDF is simple and almost always perfect — use "Save as PDF" in Word, or Word to PDF if you are on a phone or a computer without Office.
Going from PDF back to Word is harder, because the converter has to rebuild paragraphs and tables from fixed positions. For a plain letter or report, PDF to Word usually does a clean job. Multi-column layouts, complicated tables or scanned pages may need tidying afterwards. Our PDF to Word guide covers how to get the best result.
A Simple Rule of Thumb
Ask yourself one question: "Does the other person need to change this?" If yes, send Word. If no, send PDF. When in doubt, you can attach both — but label them clearly, for example *Ali_Khan_CV.pdf* and *Ali_Khan_CV_editable.docx*.
Common Mistakes
- Sending a PDF when a client clearly needs to edit the text, then having to convert it back.
- Sending a Word CV that looks perfect on your laptop but breaks on the employer's.
- Printing a Word file to PDF from a phone app that changes the page size — always check the output before sending.
Choose the format based on the job the file has to do next, and you will rarely go wrong.
