How to Sign a PDF in Mac Preview
Learn how to create, place, resize, and save a signature on a PDF using the Preview app on a Mac.
How to Sign a PDF in Mac Preview (Quick Answer)
Open the PDF in Preview, display the Markup toolbar, and select the Sign button. Create a signature with your trackpad, camera, or a nearby supported device, then place it on the document.
Resize and position the signature, then save or export a separate signed copy.
Open the PDF in Preview
Double-clicking a PDF on a Mac often opens it in Preview automatically. If it opens in another application:
- Control-click the PDF.
- Select Open With.
- Choose Preview.
Read the full document and make sure all pages display correctly before adding your signature.
Show the Markup Toolbar
Select the Markup toolbar button near the top of the Preview window. It usually looks like a pen tip inside a circle.
The toolbar contains annotation tools for text, shapes, notes, and signatures. Select the signature icon to view saved signatures or create a new one.
Create a Signature on Mac
Preview may offer several ways to create your signature.
Use the Trackpad
Select the trackpad option, click to begin, and write your signature using your finger. Press any key when finished, then approve or clear the result.
Use the Camera
Sign your name clearly on white paper. Hold it in front of the Mac camera and align the signature with the guide shown in Preview.
Use an iPhone or iPad
On compatible devices and software versions, you may be able to sign on a nearby iPhone or iPad and send the signature directly to Preview.
Choose the method that produces the clearest result.
Place the Signature on the PDF
After creating or selecting a signature:
- Click the signature thumbnail.
- Drag the signature to the correct line or field.
- Use the handles to resize it.
- Add the date or typed details if required.
Keep the signature inside the intended area and make sure it does not cover important text.
Save a Signed Copy
Before editing, consider duplicating the original PDF so you retain an unsigned copy.
When the signature is in place, save the document. You can also use Export as PDF or print to PDF to create a separate copy, but doing so may flatten annotations and affect interactive fields.
Reopen the saved file to confirm that the signature appears correctly.
Is a Preview Signature a Digital Signature?
The signature placed through Preview’s Markup tools is generally a visual electronic signature. It is not the same as a certificate-based digital signature that cryptographically verifies identity and document integrity.
If the recipient requires a digital certificate, identity verification, or an audit trail, use the signing method they specify.
Frequently Asked Questions
Can I delete a saved signature from Preview?
Yes. Open the signature menu, move the pointer over the saved signature, and use the delete control that appears.
Why is the signature tool unavailable?
The PDF may have security restrictions, or the file may not be open in Preview. Try saving a permitted copy or ask the owner for a signable version.
Can I sign several pages?
Yes. Select the saved signature again and place a copy on each required page.
Can I sign a PDF in Preview without printing it?
Yes. The entire process can be completed electronically without printing or scanning the document.