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Sign a PDF on Mac and keep your signature secure while you're at it

Preview makes signing easy. The part most people skip is deciding which documents actually need more than that — and setting up something safer for the ones that do.

For writers

For freelancers

For content creators

For startup founders

For productivity nerds

For remote workers

Setapp Apps used

Nitro PDF Pro

Work with your PDFs

PDF Squeezer

Compress PDFs without quality loss

PDF Search

Find anything in a PDF with AI

Step-by-step process

Step 1

Open the PDF in Nitro PDF Pro, click Form > Signature, and draw or import the signature — the document gets encryption and a verified record rather than a plain image dropped on the page.

Step 2

Use Nitro Sign inside Nitro PDF Pro to invite recipients by email — only they can sign, and you can track when they view and complete the document without chasing anyone manually.

Step 3

Drop the signed PDF into PDF Squeezer, choose a compression preset, and export — keeps the file light for email without affecting the signature or any sensitive content.

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Sign a PDF on Mac and keep your signature secure while you're at it

Try this workflow on Setapp