How to Sign Documents on Mac Using Preview

Quick Answer

To sign documents on a Mac using Preview, open the PDF, click the markup toolbar (pencil icon), select the signature tool, create your signature using the trackpad or camera, then place it on the document and save. The whole process takes under two minutes and requires no additional software.

Preview is macOS''s built-in PDF viewer and editor, and its signature tool is one of its most practical features. Whether you are signing a lease, a work contract, or an academic form, you can do it entirely within Preview without installing anything extra.

How to Create Your Signature in Preview

Open your PDF in Preview by double-clicking it (Preview is the default app for PDFs on Mac). Click the markup toolbar button - it looks like a pencil tip and appears in the top-right area of the toolbar. In the markup toolbar, click the Signature button (looks like a cursive signature). You will see options to create a signature using Trackpad, Camera, or iPhone/iPad.

Trackpad: Click ''Click Here to Begin,'' then sign your name on the trackpad using your finger. Press any key when done, then click ''Done.'' Camera: Write your signature on white paper with a dark pen, hold it up to your Mac''s camera, and Preview captures it. iPhone/iPad: If your devices are on the same Apple ID, you can draw your signature on your phone or tablet''s screen and it syncs directly to Preview.

Once created, your signature is saved in Preview and available every time you need to sign a document - you do not need to recreate it.

How to Place the Signature on Your Document

After creating or selecting your saved signature, it appears as a floating element on your PDF. Click and drag it to the correct signature field. Resize it by dragging the corner handles - match it to the size of the signature box in the document. Click outside the signature box to deselect. Go to File → Save (Command + S) to save the signed document. For sharing, File → Export as PDF creates a clean copy with the signature embedded.

Tips for Clean, Professional-Looking Signatures

Sign slowly and deliberately on the trackpad - fast signatures can look jagged. The camera method tends to produce the cleanest results if you write on white paper with a thick black pen in good lighting. If your signature looks too light or inconsistent, delete it (Signature tool → hover over saved sig → click the X) and recreate it. Once placed on a document, double-clicking the signature lets you resize and reposition it before saving.

Frequently Asked Questions

Q: Are Preview signatures legally valid in South Africa? A: In South Africa, electronic signatures are recognised under the Electronic Communications and Transactions Act (ECT Act) of 2002. A simple electronic signature (including a Preview signature) is legally valid for most ordinary documents. For specific high-stakes contracts, consult a legal professional about whether an advanced or qualified electronic signature is required.

Q: Can I sign a Word document using Preview on Mac? A: Preview can open Word documents but may not preserve formatting perfectly. For best results, ask the sender for a PDF version, or convert the Word document to PDF first using File → Print → Save as PDF in Word before signing in Preview.

Q: How do I delete a saved signature in Preview? A: Open the Signature panel in Preview''s markup toolbar, hover over the saved signature, and click the X that appears to the left of it. This removes it from all your Apple devices signed into the same Apple ID.