Mac has Preview for basic signatures, but it is limited to trackpad drawing only. Here is a more versatile free method that also lets you type or upload a signature image.
Navigate to pdfeditor.onl/sign-pdf. Works on all Mac models in Safari or Chrome.
Draw with your trackpad using the mouse/trackpad canvas — or type your name in a handwriting font — or upload a scanned signature image. All three methods work on Mac.
Tip: For the most natural-looking signature on Mac, use a trackpad with Tap to Click enabled. Draw slowly for clean results.
Drag the signature to the correct position. Resize with corner handles. Click Download Signed PDF.
For most users, yes. Preview is limited to trackpad drawing. pdfeditor.onl also supports typed and uploaded signatures, and lets you resize and precisely position the signature.
Yes — completely free in Safari or Chrome on Mac.