PDFirma
Seamless PDF Signing
Only for Mac
$5.99
Mac
PDFirma is a native macOS app for preparing, signing, and validating PDF documents with digital certificates.
Built for a fast and focused desktop workflow, PDFirma helps you place visible signature fields, prepare documents for one or multiple signatures, apply digital signatures, and review validation details without unnecessary complexity.
Features:
• Open and inspect PDF documents on macOS
• Add visible signature fields to one or more pages
• Prepare documents for single-signature and multi-signature workflows
• Sign PDF documents using certificates available in Keychain Access
• Validate signatures and review technical diagnostics
• Configure timestamp authority support for advanced signing scenarios
• Work with a clean, native macOS interface designed for speed and clarity
PDFirma is built for professionals who want secure, native, and efficient PDF signing on Mac.
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
PDFirma 1.3.0 adds a new local handwritten signature workflow and a more polished signing experience.
• Add a handwritten visual signature when you only need to place your personal signature on a PDF.
• Draw your signature with the mouse/trackpad or import a PNG/JPG image, then reuse it locally without uploading it again.
• Choose how to apply your signature with a clearer selector: electronic seal, handwritten signature, or electronic seal with handwritten signature.
• Improved visible signature stamps with better scaling, wrapping and spacing for long certificate names.
• Better support for compact signature boxes, multi-signature documents and co-signing workflows.
• Safer handling of a wider range of PDF structures, with clearer messages when a document cannot be signed safely.
• Improved diagnostics, localized text and user-facing signing messages.
• Fixed issues affecting handwritten signature placement and orientation on some PDFs.
• General stability, compatibility and performance improvements.
The developer, Mario Alfonso Medina Macias, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Mario Alfonso Medina Macias
- Size
- 2.1 MB
- Category
- Productivity
- Compatibility
Requires macOS 15.0 or later.
- Mac
Requires macOS 15.0 or later.
- Mac
- Languages
English and 9 more
- English, French, German, Hindi, Japanese, Korean, Portuguese, Simplified Chinese, Spanish, Traditional Chinese
- Age Rating
4+
- 4+
- Copyright
- © 2026 Mario Alfonso Medina Macías

