Signing a PDF with a digital certificate can end up being more complicated than it should be. To address that problem, PDFsigna proposes a desktop application that lets users sign documents with certificates from Spain’s Fábrica Nacional de Moneda y Timbre (FNMT) or .p12 files, without depending on an account of its own, uploading documents to external servers, or paying a mandatory subscription. Its proposal also includes an indicator that explains what type of electronic signature will be generated and what that means from a legal standpoint. However, the published information about its availability isn’t entirely consistent, and it’s worth checking the status of each version before trying to install it.
PDFsigna in 20 seconds
- PDFsigna wants to make it easier to sign PDFs with a digital certificate from a native application.
- The proposal prioritizes privacy: documents and private keys stay on the device.
- Its “legal traffic light” aims to explain the signature level you’ll get before you sign.
- It competes with AutoFirma, Adobe Acrobat, and other tools, with differences in price and features.
- The website advertises a free version and a future Pro plan, but the published availability needs further checking.
The initiative responds to a common need among individuals, freelancers, and small businesses: signing a contract, an authorization, or an administrative document without having to learn how to use a complex program. The application aims to reduce the number of steps required and avoid forcing users to create another account or sign up for a recurring service just for a one-off task.
The most important difference is that PDFsigna doesn’t just aim to place an image of a signature on a page. It also wants to use the digital certificate to generate a cryptographic signature embedded in the PDF, so the identity tied to the certificate can be verified and any changes made to the document after signing can be detected.
What PDFsigna Offers Compared With AutoFirma
AutoFirma is the best-known tool in Spain for digitally signing documents and completing procedures with public administrations. It’s an official application that lets users select local files, choose a valid certificate, and generate signatures in different formats. It also integrates with the signing procedures used by numerous government electronic offices.
PDFsigna wants to focus on a more straightforward desktop experience, with an interface designed for signing everyday documents. According to its developer’s documentation, it will be able to use certificates stored in the system keystore or import .p12 files. The project also claims that the private key never leaves the location where it’s stored and that the application works locally, without sending documents to external servers.
Compatibility with these certificates doesn’t mean the two tools are interchangeable in every situation. AutoFirma may be required to complete certain procedures on government electronic offices, which can demand a specific format or signing flow. PDFsigna is presented mainly as a tool for working with PDF documents from the desktop.
There’s another practical difference. AutoFirma’s official documentation states that it doesn’t require Java on Windows or macOS, though it does need a Java environment on Linux. So claiming that PDFsigna eliminates Java doesn’t mean AutoFirma forces users to install it on every machine. The advantage the new project puts forward mainly concerns its design and avoiding extra configuration on systems where AutoFirma can run into trouble. PDFsigna isn’t the only project chasing that angle, either — rFirma recently shipped a native, Java-free Windows build aimed at the same pain point.
Availability is also something to be cautious about. PDFsigna’s main page states that no version has been released yet, while its support and comparison pages describe a Windows version on the Microsoft Store and a macOS version pending Apple’s review. That inconsistency makes it impossible to confirm the release status without checking the stores directly.
The “Legal Traffic Light” Aims to Clarify What’s Being Signed
One of PDFsigna’s most notable features is what it calls a “legal traffic light.” The idea is to show, before signing, what level of electronic signature will be obtained depending on the certificate used and where its private key is stored. Afterward, the program aims to display information about the signature on a received document, such as the certificate’s validity and whether it has been modified since it was signed.
The distinction matters because not every action described as “signing a PDF” offers the same guarantees. Inserting an image of a handwritten signature can help visually identify a document, but it isn’t the same as generating a cryptographic signature with a digital certificate.
PDFsigna states that its certificate-based signatures are generated in PAdES format, a technical standard used to embed electronic signatures in PDF documents. It also links its operation to the advanced electronic signature requirements of the European eIDAS Regulation. The specific level, however, depends on the certificate and the conditions under which it’s used.
An FNMT software certificate installed on a computer doesn’t automatically turn the signature into a qualified electronic signature equivalent to a handwritten one across the European Union. Reaching that level requires additional requirements related to the certificate and the signature creation device or mechanism. The traffic light aims to keep users from confusing these categories.
The developer says it has cross-checked examples of signed documents using tools such as VALIDe, the European Commission’s DSS validator, and Adobe Acrobat Reader. These are useful references for verifying signatures, but they shouldn’t be confused with an official certification of PDFsigna. The website itself clarifies that the application isn’t certified or approved by the European Union.
PDFsigna Compared With Adobe Acrobat and Other Alternatives
The comparison with Adobe Acrobat shows two different approaches. Acrobat Standard offers features for editing, converting, protecting, and signing PDF documents, as well as collecting electronic signatures and tracking responses. Its published price in Spain is €18.30 per month with annual billing, VAT included, according to the rate checked. It’s a broader solution, but it comes with a recurring cost.
PDFsigna offers an alternative more focused on local use and certificate-based signing. Its website describes a free 1.0 version and a future Pro plan, whose price will be announced once it’s available. The terms page also lists an earlier estimate of €39 for a Pro license, but clarifies that it isn’t a confirmed sale price. So that figure shouldn’t be presented as a final rate.
Another alternative is PDFgear, which offers free tools for working with PDFs and includes digital signing features. Before trusting sensitive documents to any application, it’s advisable to review its terms, how it handles data, and how it manages keys. The availability of a signing feature alone isn’t enough to establish that two products offer the same legal level or the same privacy guarantees.
For users who only need to verify a signature they’ve already received, installing a new application isn’t always necessary. VALIDe lets users verify electronic signatures and certificates within the Spanish public administration’s environment, while the European Commission’s DSS service and Adobe Acrobat Reader offer other ways to check the validity of a signed document.
The choice, then, depends on the use case. AutoFirma remains relevant for administrative procedures; Acrobat combines editing and document management in a paid suite; and PDFsigna aims to simplify local PDF signing with a certificate. Its main challenge will be proving that the announced experience works reliably on the planned platforms and that the information about its availability is made clear.
Frequently Asked Questions
Is PDFsigna an alternative to AutoFirma?
It aims to be an alternative for signing PDFs from the desktop, but it shouldn’t be assumed to replace AutoFirma for every administrative procedure. Some government electronic offices may require a specific signing flow.
Can you sign a PDF with an FNMT certificate?
PDFsigna states it will allow the use of FNMT certificates stored in the system or imported from a .p12 file. The actual availability of each version should be checked before installing it.
Does a digital certificate signature always carry the same weight as a handwritten signature?
No. The legal level depends on the certificate and the mechanism used to create the signature. A visual signature image, an advanced signature, and a qualified electronic signature aren’t the same thing.
How much does PDFsigna cost?
The website advertises a free version and a planned Pro plan, whose final price hasn’t been confirmed. The €39 estimate that appears in the terms shouldn’t be read as a current sale price.
