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.

A worked example: a freelance contract from DOCX to signed PDF

Say Maria, a freelance designer, has a four-page contract in Word for a new client, Northwind Ltd. The client's operations manager signs first and the finance director countersigns. Maria accepts all tracked changes, deletes the comment thread, and leaves two signature blocks at the end with a name and date line under each. She uploads the .docx, checks the converted PDF page by page, and notices the payment table now breaks across pages three and four.

She goes back to Word, inserts a page break before the table, saves and uploads again. On the clean version she places, for the operations manager, a signature, a date and initials on each page; for the finance director, a signature and a date. She sets a signing order so the finance director gets the link only after the manager signs, and sends. Two days later both have signed, and everyone receives the same PDF with a certificate page listing each signer's email, timestamps and IP address.

Which fields should you add to a DOCX contract?

A signature field on each signature line is the obvious one. Add a date field next to it rather than a blank line for people to type into; the signing date is then recorded consistently. If your contract asks for initials on every page, add an initials field per page for each signer who needs to initial, so nobody skips one.

Use text fields for things only the signer knows: a company registration number, a billing address, a job title. Checkboxes suit choices such as "I agree to receive invoices by email". Mark the ones that must be completed as required. Resist the urge to turn the whole contract into a form; if a clause needs changing, change the DOCX and upload it again. For signing-day detail on initials, see how to add initials to a PDF.

What if you need to change the DOCX after you have sent it?

It happens: the client spots a wrong day rate, or the start date moves. Do not ask signers to write corrections into a text field. Void the document you sent, which stops the old links from working and records the cancellation in the audit trail, then fix the wording in Word, upload the corrected .docx and send it again. Signers get a fresh link to the right version.

If someone has already signed the old version, tell them why a new one is coming. A one-line email ("we corrected the rate in clause 4, please sign the updated copy") avoids confusion. Afterwards, keep only the completed version with its certificate as the contract, and file the voided one separately in case anyone later asks what changed.

DOCX files that need extra care before upload

Documents with content controls, fields or macros: the converter shows the current visible text, not the logic behind it. Update all fields (in Word, select all and press F9 on Windows) so dates and cross-references show their final values. Macros do not run during conversion, which is what you want, but any text they would have generated will not appear.

Documents built from text boxes and shapes, common in brochures and some forms, are the most likely to shift. Rebuild key parts as normal paragraphs or tables if you can. Headers and footers convert fine, but check page numbers. If a document has a cover page with a watermark like DRAFT, remove it before uploading; a signed contract with DRAFT across every page invites a pointless dispute.

Our take

Sources and further reading

• Insert a signature in a Word document – Microsoft Support
• Add or remove a digital signature in Microsoft 365 files – Microsoft Support
• ESIGN Act, 15 U.S.C. § 7001 – general rule of validity (Cornell LII)