pdfcdf
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How to sign a PDF on Mac

macOS ships with Preview, which is genuinely good at some PDF work — it can rotate pages, and you can drag pages between two open documents. But Preview is fiddly for anything beyond that, it can't edit existing text, and its page-thumbnail dragging is easy to get wrong. A browser tool gives you a clearer interface for the same job, with no upload and no Acrobat subscription.

Signing is the classic mobile job — a contract arrives by email and you need it signed and returned without finding a printer, a scanner and a pen.

Open Sign PDF →

Step by step on Mac

  1. 1Open the Sign PDF tool and upload your document.
  2. 2Draw or type your signature in the side panel.
  3. 3Click on the page to place it, drag to position, then download the signed PDF.

Click to browse and the standard macOS file dialog opens — or just drag the PDF from Finder or your desktop straight onto the page, which is usually faster.

Where the finished file is saved on Mac

Your browser saves the result to ~/Downloads by default, and it appears in the downloads list in the toolbar. From there drag it straight into Mail, Finder or a Slack message.

What Mac can’t do on its own

Preview can rotate and reorder pages, but it cannot edit existing text, fill non-interactive forms, run OCR on a scan, or convert a document to other formats. Adobe charges a monthly fee for those; this doesn't.

FAQ

Why not just use Preview on my Mac?
Preview is fine for rotating pages or dragging thumbnails between two open PDFs. It can't edit existing text, OCR a scan, or convert formats — and its drag-based page shuffling is easy to get wrong on a long document.
Does this work on Apple Silicon Macs?
Yes. It's a web page, so it runs identically on M-series and Intel Macs, in Safari, Chrome, Arc, Firefox or Edge.
Is a drawn signature legally valid?
In many places a simple electronic signature is accepted for everyday agreements. For legally-certified digital signatures with a certificate, use a dedicated e-signature service.
Can I place my signature on any page?
Yes — click anywhere on any page to drop your signature, then drag and resize it, and add it in as many spots as you need.
Is pdfcdf free to use?
Yes. Every tool on pdfcdf is completely free, with no account, no watermarks, and no limits on how many files you process.
Are my files safe? Do they get uploaded?
Your files never leave your device. Every tool runs entirely in your browser, so your documents are processed locally and are never uploaded to a server or seen by anyone.
Do I need to create an account or sign up?
No. pdfcdf works instantly with no sign-up, no email, and no software to install — just open the tool and go.
Does it work on mobile phones and tablets?
Yes. pdfcdf runs in any modern browser on phones, tablets, Mac, Windows and Linux — nothing to download.

Ready to sign a PDF on your Mac?

Open Sign PDF →

Same tool, other devices

Sign a PDF on iPhoneSign a PDF on AndroidSign a PDF on WindowsSign a PDF on ChromebookSign a PDF on iPad

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