How to E-Sign a DOCX File

What happens to the DOCX when you upload it?

We detect the real file type from its contents, not just the extension, then convert it to PDF with LibreOffice on our own server. The conversion happens inside eSignSimple's infrastructure; the file is not sent to a third-party conversion service. We keep the converted PDF, not the Word file: it is stored encrypted at rest (AES-256-GCM), and you can delete the document at any time. Keep your .docx as your own working copy.

From then on, the PDF is the document. Signers see it, fields are stamped onto it, and the final signed file is a PDF with a certificate of completion page added at the end. That is deliberate: a DOCX can be edited by anyone who opens it, a completed PDF with a recorded fingerprint cannot be changed without it showing.

DOCX signing checklist: what to fix before you upload

Tracked changes and comments: accept or remove them. A conversion shows the document as it currently displays, and you do not want a signer arguing about a visible deletion mark.

Fonts: stick to common fonts where you can. If your document uses a font our converter does not have, a similar one is substituted, which can nudge line breaks.

Signature blocks: leave a clear blank line or a small table cell for each signature. It makes placing the field obvious and keeps the signature from overlapping text.

Fillable bits: if the client must enter a start date, a company name or tick an option, leave space and add text, date, checkbox or dropdown fields in the builder rather than asking them to edit Word.

DOCX vs. PDF for e-signatures: which is better?

For drafting, DOCX wins: it is where contracts get written and negotiated. For signing, PDF wins: fixed layout, identical on every device, and fingerprintable. Our take is that you should not have to choose, which is why eSignSimple takes the DOCX and produces the PDF for you. If you already have a PDF, upload that instead and skip the conversion step entirely.

Can I e-sign a DOCX on my phone?

Signers can sign on any phone: they open the link, tap the fields and sign with a finger. As a sender you can upload from a phone browser too, although placing fields precisely is easier on a larger screen. The free in-browser Sign PDF tool is PDF-only, so on a phone, a DOCX goes through the regular upload.

What if the conversion looks wrong?

Fix it in Word and upload again rather than working around it with fields. Most issues come from unusual fonts, floating text boxes, or content that only shows in a particular view. If a table breaks across pages awkwardly, insert a page break before it. Starting from one of our templates, such as the freelance contract, avoids most layout surprises. The broader Word options, including signing only yourself, are compared in how to electronically sign a Word document, and the send-and-track steps are in how to send a document for signature.

Exported from Google Docs or LibreOffice?

A DOCX downloaded from Google Docs, or an .odt saved from LibreOffice, uploads the same way. Google-specific options, including Workspace eSignature, are covered in how to sign a document in Google Docs.

Our take