Evenseal

How to sign a PDF on a Mac — free

Your Mac already has a free signing tool built in: Preview.app. It works, but its trackpad and camera signature capture is fiddly. A browser-based signer skips both and gets you a signed PDF faster.

Sign a PDF on your Mac

Method 1: Preview.app (built into every Mac)

  1. 1Open the PDF in Preview (the default app for PDFs on macOS), then click the markup toolbar icon — the pen-tip icon near the top right.
  2. 2Click the signature icon, then choose “Create Signature.” You’ll be asked to either draw your signature by dragging your finger across the trackpad, or sign a piece of white paper and hold it up to your Mac’s camera so Preview can capture it.
  3. 3Drag the saved signature onto the page, resize it, then export or save the PDF.
Trackpad drawing

Most people can’t produce a clean signature by dragging a fingertip across a trackpad — it usually comes out jagged or nothing like a real signature.

Camera capture

Requires printing a blank page, physically signing it, then holding it steady in front of the webcam under decent lighting until Preview recognizes it.

Either way, the signature saves locally inside that Mac’s Preview app — it won’t show up if you switch to your iPhone or a different computer later.

Method 2: sign it in your browser instead

Skip the trackpad and the camera. Open the PDF in a browser-based signer, type or draw your signature with a mouse or trackpad on a proper signing canvas, drag it into place, and download the signed file. It works the same way on a MacBook, an iMac, an iPhone, or a Windows laptop — because it’s just a web page, not an app tied to one Mac.

  • No hunting for a pen and paper, no propping the file up to a webcam.
  • Your PDF is read and signed in your browser — nothing is uploaded to a server.
  • No account or app install required.
Sign a PDF on your Mac

Need someone else to sign it too?

Neither Preview.app nor a self-sign browser tool sends a document out for someone else to sign. Send any document for signature from Evenseal and get back a sealed, certified copy with a verifiable audit trail — free to start, one flat price when you need unlimited sending.

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Frequently asked questions

How do I sign a PDF for free on a Mac without installing anything?
Two ways. Preview.app is already on every Mac: open the PDF, click the markup toolbar icon, then the signature icon, and either draw your signature with the trackpad or hold a signed piece of paper up to your webcam. Or skip Preview entirely and sign in your browser — drop the PDF in, draw or type your signature, and download it. Both are free.
Why is Preview’s signature tool so hard to use?
Preview only offers two ways to create a signature: drawing it with the trackpad — which most people can’t do cleanly with a mouse-driven cursor — or holding a physical signed paper up to the built-in camera and hoping the lighting and angle are good enough for it to capture cleanly. The signature is also saved locally to that one Mac’s Preview app, so it doesn’t follow you to another computer or your phone.
Does a Preview.app signature hold up if it’s ever questioned?
A drawn or typed signature is generally legally valid for everyday agreements under laws like the US ESIGN Act and UETA. What Preview doesn’t add is an audit trail — a record of who signed, when, from where, and proof the file wasn’t altered afterward — which is what actually matters if a signature is ever disputed. Are electronic signatures legally binding?.
What if I need to sign the same way on my iPhone or a Windows PC later?
A trackpad-drawn Preview signature stays local to that Mac. A browser-based signature works identically on a Mac, iPhone, iPad, or Windows PC, since it just runs in the browser you already have open. How to sign a PDF on iPhone or Android.