Can I sign with my MacBook trackpad?

Yes. Draw in the signature box with one finger on the trackpad. If it looks shaky, try Type instead and pick a handwriting font.

Is this a legally binding digital signature?

It adds a picture of your signature, not a certificate-based digital signature. Whether that's enough depends on the document and on who asked for it.

Is my signature saved on the Mac?

No. The tool doesn't keep it. Click Download transparent PNG if you want a copy to reuse.

Can I sign more than one page?

Yes, one page at a time: download the signed PDF, open it again and place the next signature.

Sign PDF on Mac – Draw on the Trackpad or Type, Free

How to sign a PDF on a Mac

Draw your signature in the box with the trackpad or mouse, or click Type, enter your name and choose one of six fonts.
Pick an ink colour: black, blue, navy, red or any custom colour.
Under Sign a PDF, click Choose PDF, and choose the page from Page … of ….
Drag the signature box into place and drag its corner handle to resize it.
Click Download signed PDF. The copy is saved as name-signed.pdf; the original isn't changed.

A typed signature placed near the bottom of an invoice page in the Sign PDF tool, with the six font choices above — Typed signature in the first font, placed on page 1 of a 3-page test invoice, October 22, 2026.

What we found when we tested it

We ran the live tool on October 22, 2026 (PT) in headless Google Chrome 155 on Linux, with sample files we made for the test. We signed page 1 of a 3-page invoice we made.

Check	Result
Signature	One image added to page 1; pages 2 and 3 unchanged
Rest of the document	Text still selectable; no annotations or form fields added
Certificate signature	None: 0 signature fields. It's an image, not a digital signature.
Touch	A signature drawn by touch in iPhone 13 and Pixel 7 emulation was placed and downloaded the same way

Preview can do this too

Preview has a signature tool in the Markup toolbar. Apple's guide describes creating a signature with the trackpad, with your Mac's built-in camera (sign on white paper and hold it up), or on an iPhone or iPad, then dragging and resizing it on the page, and the signature can sync through iCloud. If you sign on the same Mac regularly, that's convenient. This tool is handy on a Mac you don't usually use, since nothing is saved to the computer, or when you want a typed signature in a handwriting font or a transparent PNG of your signature (Download transparent PNG).

Know what this signature is

It's a simple electronic signature: a picture on the page. There's no signing certificate and no tamper seal, so it isn't a "digital signature" in the technical sense.
Whether that is acceptable depends on whoever asked you to sign. If they sent you a link from an e-signature service, sign there instead.
One signature per download. To sign several pages, download, open the signed file again and add the next one.
It doesn't fill form fields or add dates or text.

Privacy

The work happens in your browser tab, so your files aren't uploaded. The site counts page visits and sends one anonymous event per use (tool name, whether it worked, a file-size range). No event is sent when Global Privacy Control or Do Not Track is on. See the privacy policy.

Related tools

Sign PDF: the main tool
Merge PDF on Mac
Compress PDF on Mac
Split PDF on Mac
Unlock PDF: if the PDF needs a password

Sources

Apple Preview User Guide, "Fill out and sign PDF forms in Preview on Mac": https://support.apple.com/guide/preview/fill-out-and-sign-pdf-forms-prvw35725/mac
PDFWrangle Sign PDF, live tool, checked October 22, 2026: https://pdfwrangle.com/sign-pdf

Sign a PDF on a Mac