You can sign a Word document on your iPhone using built-in tools — no separate app needed
Apple's built-in signature feature works directly inside the Word app on your iPhone. You draw your signature on the screen, and it gets embedded into the document as an image. The process takes about two minutes and works with any Word document you have open.
The signature appears as a picture in the document, not as a legally binding digital signature tied to your identity. This method works for signing contracts, agreements, forms, and other documents where a handwritten signature is expected — but understand that it is a picture of your signature, not cryptographic verification of who you are.
Key Takeaways
- Open the Word document in the Word app on your iPhone, then tap where you want the signature to go.
- Tap Insert, then Signature, and draw your signature with your finger on the screen that appears.
- The signature saves as an image inside the document and moves with the text if you edit the page.
- You can resize the signature by tapping it and dragging the corner handles, or delete it by tapping and selecting Delete.
- Email or share the signed document directly from Word — the signature stays embedded in the file.
Step-by-step: Adding your signature to a Word document
Step 1: Open the document in Word. Launch the Microsoft Word app on your iPhone and open the document you need to sign. If the document is in your email or iCloud Drive, you can open it from there — Word will launch automatically.
Step 2: Position your cursor where the signature goes. Tap the spot in the document where you want the signature to appear. This is usually at the bottom of the page, near a line that says "Signature:" or similar. If there is no signature line, tap at the end of the document or wherever makes sense for your document.
Step 3: Open the Insert menu. Tap the Insert tab at the bottom of the screen. On some versions of Word, this appears as a plus icon (+) instead of the word "Insert." Tap it to open the menu of things you can add to the document.
Step 4: Select Signature. Look for the Signature option in the Insert menu. Tap it. A new screen will appear with a blank white box and instructions to sign.
Step 5: Draw your signature. Use your finger to sign your name in the white box. Sign naturally — the iPhone captures your finger movement as you write. If you make a mistake, tap Clear and start over. When your signature looks right, tap Done.
Step 6: Confirm the signature placement. The signature now appears in your document at the spot where you placed the cursor. It shows as an image, not as text. You can tap it to select it, then drag it to reposition it if needed.
Resizing, moving, or removing your signature
Once the signature is in the document, you can adjust it. Tap the signature image to select it — you will see small square handles appear at the corners and edges. Drag any corner handle to resize the signature while keeping its proportions. Drag the signature itself to move it to a different spot on the page.
If you need to remove the signature, tap it to select it, then press the Delete key on the keyboard or tap Delete if a menu appears. The signature disappears and the document returns to its previous state. You can add a new signature in the same spot or elsewhere in the document.
If you resize the signature too small, it becomes hard to read. A signature that takes up roughly one to two inches of width on the page is usually the right size — large enough to be clear, small enough to fit in a signature line.
Saving and sharing your signed document
Word saves your changes automatically as you work, so the signature is already saved once you tap Done after drawing it. You do not need to take any extra step to preserve the signature in the file.
To share the signed document, tap the Share button (usually three dots or a square with an arrow) at the top of the Word app. You can email it, send it via Messages, save it to iCloud Drive, or share it through another app. The signature stays embedded in the document no matter how you send it — the person who receives it will see your signature in the Word file.
If you need to send the document as a PDF instead of a Word file, you can export it. Tap the three dots menu, look for Export or Save As, and choose PDF format. The signature will appear in the PDF as well.
What to do if the signature does not appear or looks wrong
If you tap Insert and do not see Signature as an option, make sure you are using a recent version of Word. Open the App Store, search for Microsoft Word, and check whether an Update button appears. If it does, tap Update to get the latest version. Older versions of Word may not have the signature feature.
If your signature looks shaky or unclear, the problem is usually that you signed too quickly or your finger slipped. Tap the signature, delete it, and try again. Sign more slowly and deliberately, keeping your finger in contact with the screen. If the screen is dirty or wet, wipe it dry first — that can cause tracking problems.
If the signature appears in the wrong place or overlaps with text, tap it and drag it to the correct position. If it is too large or too small, select it and resize using the corner handles. You can also delete it and insert a new one in a better location.
Signing documents from email or cloud storage
If someone sends you a Word document in email, you can sign it without downloading it separately. Open the email, tap the attachment, and Word opens automatically. Follow the same steps to insert your signature. When you are done, tap Save or the back arrow — Word will ask whether you want to save changes. Tap Save, and the signed document is ready to send back.
Documents stored in iCloud Drive, OneDrive, or Dropbox work the same way. Open the file from the cloud app or from Word's recent files list, add your signature, and save. The signed version stays in the cloud storage, and anyone with access to that folder will see the updated file.
If you are signing a document that came from someone else, consider asking them whether they need it as a Word file or whether a PDF is acceptable. Some organizations have specific requirements about file format, and knowing this before you sign saves a back-and-forth.
Frequently Asked Questions
Can I use the same signature for multiple documents?
You can draw your signature once and use it in as many documents as you want. Each time you insert a signature, you draw it fresh, but you can draw it the same way each time. Word does not save a signature template that you can reuse — you draw it new each time you sign a document.
What if I want to sign a PDF instead of a Word document?
The Word app signature feature only works inside Word documents. To sign a PDF on your iPhone, use the built-in Markup tool: open the PDF in the Files app or Mail, tap Markup, select the signature tool, draw your signature, and save. Alternatively, use a dedicated PDF app like Adobe Acrobat Reader, which has its own signature feature.
Does my signature have any legal weight?
A signature you draw on your iPhone is a picture of your handwriting, not a cryptographically verified digital signature. It has the same legal standing as printing a document, signing it by hand, and scanning it back in — which is to say, it depends on the context and the other party's acceptance. For contracts or formal documents, check with the other party about whether they will accept a signature created this way.
Can I undo a signature after I close the document?
Once you close and save the document, the signature is permanent. If you reopen the document later and want to remove the signature, you can tap it and delete it, then save again. But if you close the document without saving, any changes including the signature are lost.
What happens if I sign a document and then edit it?
The signature stays in place as an image. If you add or delete text above the signature, the signature does not move — it stays at the exact spot where you placed it. You may need to move the signature down if you add a lot of text above it, or move it up if you delete text. Tap the signature and drag it to the correct position.