SignetMac App StoreAdd watermarks, lock down permissions, and personalize PDFs in bulk — all on your Mac, with real vector text that stays sharp and searchable.
Available on the Mac App Store
Signet turns any PDF into a properly sealed, on-brand, protected document — without ever touching the text underneath.
Every watermark Signet adds is real vector content, not a flattened image, so your PDF's text stays sharp, searchable, and selectable, and every link, outline, and fillable form field survives untouched.
A live preview shows exactly where every watermark lands, on a sample page or page one of your own PDF, and updates as you adjust it. Signet follows your Mac's light or dark appearance, or you can pick one in Settings.
Set an owner password and control printing, copying, editing, and accessibility — the same permission model as the macOS Preview security sheet, so if you know Preview, you already know Signet.
Save any combination of watermarks, security settings, and output preferences as a named profile. Switch between them instantly — a "Confidential" profile for internal drafts, a "Client Copy" profile for anything leaving the building.
Drop in a list of names, put {name} anywhere in a watermark's text, and generate one uniquely stamped copy per name from a single source PDF — perfect for handouts, certificates, or personalized client documents.
Combine pages from multiple PDFs into one, split a single PDF into several, and drag pages into any order you like, right in Signet's main window — and seal the results the moment they're exported, with no separate app needed before or after watermarking.
"Seal PDFs with Signet" is a full Shortcuts action, so you can watermark and secure PDFs as one step in a bigger automation — after a scan lands in a folder, before an email goes out, or however you already work.
Set title, author, subject, keywords, creator, and producer on the way out — or leave any field blank to keep what the original PDF already has.
Drag files onto the app or its Dock icon, or use the Choose Files button — whatever's fastest. Point Signet at a synced folder (iCloud Drive, Dropbox, or similar) to share your profiles across every Mac you use.
Signet respects the PDF you started with: tagged accessibility structure, outlines, and interactive form fields are all preserved, because a watermark shouldn't cost you the rest of the document.
No. All processing happens on your Mac, and Signet makes no network requests of its own. See the privacy policy.
No. Watermarks are added as real vector content. Text stays sharp, searchable, and selectable, and links, outlines, and form fields are preserved.
Turn on profile sync in Settings and point Signet at a folder inside iCloud Drive, Dropbox, or a similar synced location. Each Mac reads profiles from that same folder.
macOS keeps Mac App Store apps in a sandbox, so Signet has to ask once for each folder it saves sealed files into. Choose a parent folder like Documents and you'll be asked far less often. You can see and remove these folders any time in Settings under Folder Access.
Add a list of names, place {name} anywhere in a watermark's text, and Signet generates one uniquely stamped copy per name from a single source PDF.
Signet cannot recover it. Owner passwords are stored in the PDF itself, not by Signet. Keep the unprotected original and re-export.
Signet is built by Shadow Access. Email shadowteam@shadowaccess.ca and you will hear back from the developer.
