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The choice is really about one question: should the recipient be able to change this document?
No upload. No watermark. No sign-up. Every tool mentioned here runs inside your browser.
The layout must not change — invoices, contracts, résumés, reports, anything going to a printer.
The document is final. A PDF signals "this is the version"; a DOCX signals "please edit".
You need to protect it — PDF supports encryption and permissions; DOCX protection is weaker and easier to bypass.
The recipient must edit — a draft, a template, a form that gets filled and returned.
You are collaborating and comments or tracked changes matter.
The document is long and will be restructured. Editing a PDF is always a workaround.
DOCX → PDF is reliable: the word processor lays out the page, then freezes it. Fonts must be available, or they get substituted.
PDF → DOCX is reconstruction, not recovery. Paragraph structure, columns, tables and text boxes are guessed from glyph positions. Expect cleanup — sometimes a lot.
Round-tripping (DOCX → PDF → DOCX) loses formatting every time. Keep the original DOCX as the master.
No. PDF has no paragraphs or styles — only positioned glyphs. Editing is always cover-and-replace.
Usually PDF, because it can embed compressed images efficiently. A DOCX with the same photos is often larger.
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