How to Add a Signature to a PDF on Mac
Sign PDFs on Mac without installing Adobe or any software. Works in Safari, Chrome, and Firefox draw your signature with your trackpad and download.
Your options for signing PDFs on Mac
Mac users have several options for adding a signature to a PDF:
- macOS Preview built-in, free, but stores signatures in iCloud and has limited positioning
- Adobe Acrobat Pro full-featured, but $19.99–29.99/month
- Browser-based tools free, no install, works in Safari/Chrome, no iCloud dependency
For most people, a browser-based tool is the best balance: free, private, and more flexible than Preview without the cost of Adobe.
Method 1: Sign a PDF using PrivaPDF (recommended)
This method works in Safari, Chrome, and Firefox on any Mac Intel or Apple Silicon.
Go to privapdf.net/sign-pdf in Safari or Chrome. No account or download needed.
Drag the PDF file from Finder onto the page, or click to browse. Everything stays on your Mac no server upload.
Draw your signature using your Mac's trackpad the drawing canvas responds naturally to trackpad pressure. Alternatively, type your name or upload an image of your signature.
Drag the signature to the correct position. Resize it by dragging the corner handles.
Click download. The signed PDF saves to your Downloads folder.
Method 2: Sign a PDF using macOS Preview
Preview is built into macOS and free. Here's how to use it:
Right-click the PDF in Finder and choose Open With → Preview.
Click the pencil icon in the toolbar, or go to View → Show Markup Toolbar.
Click the signature icon (looks like a cursive S). Choose Create Signature to draw one with your trackpad or capture one with your camera.
Click your saved signature to insert it. Drag and resize it to fit the signature field.
Press ⌘S to save, or File → Export as PDF for a fresh copy.
Frequently asked questions
Does PrivaPDF work on Apple Silicon (M1/M2/M3) Macs?
Yes. WebAssembly is fully supported by all Apple Silicon chips. PDF processing performance is typically excellent on M-series Macs.
Can I sign a PDF in Safari on Mac?
Yes. PrivaPDF is fully compatible with Safari 16+ on macOS Ventura, Sonoma, and later. It also works in Chrome and Firefox.
Will the signature look the same quality as Adobe Acrobat?
Yes. Both tools embed the signature as a vector or high-resolution image in the PDF. There's no visual quality difference in the final document.