Filling out a PDF document online has not posed any technical difficulties for several years. The real issue for those who regularly handle forms lies in the discrepancies between tools: compatibility with interactive fields, signature management, data protection before sharing. This article compares the main applications for filling out a PDF document based on concrete criteria, incorporating a parameter that most comparisons overlook: the European regulatory framework surrounding electronic signatures.
eIDAS Framework and Signature Levels: What PDF Tools Do Not Specify
The majority of consumer applications offer a so-called “simple” signature: you draw or import an image of your signature, which is then applied to the PDF. This approach is sufficient for common use (acknowledgment of receipt, internal form), but does not meet the requirements for an advanced or qualified signature as defined by European regulation.
Regulation (EU) 2024/1183 has amended the eIDAS framework by introducing the European digital identity wallet. For PDF application developers, the distinction between these three levels of signature has become a matter of document compliance, not just a premium option to check.
Before choosing a PDF filling application, it is worth checking whether the tool is limited to a simple signature or if it at least offers an advanced signature with a digital certificate. This information is rarely found on download pages.
Comparison of Online PDF Applications: Features and Limitations
The table below contrasts the most commonly used tools based on four discriminating criteria: support for interactive form fields, type of signature offered, cross-platform availability, and protection options before sharing.
| Application | Interactive Fields | Signature | Platforms | Protection Before Sharing |
|---|---|---|---|---|
| Adobe Acrobat (web/desktop) | Yes, all types | Simple, advanced, qualified | Web, Windows, Android, iOS | Redaction + password + metadata removal |
| Foxit Reader | Yes | Simple and advanced | Windows, Android, iOS | Password, partial redaction |
| PDFelement (Wondershare) | Yes | Simple and advanced | Windows, Android, iOS | Password |
| JetSign | Basic only | Simple | Android, iOS | No native options |
| Files/Mail iOS (integrated) | No | Simple (markup) | iOS only | None |
Two gaps clearly emerge from this grid. The first concerns data protection before sharing. Adobe Acrobat is the only one to combine redaction, removal of hidden data, and password protection in a single workflow. For a form containing sensitive information (health, finances, civil status), this capability changes the nature of the risk.
The second gap relates to the recognition of interactive fields. JetSign and the integrated iOS functions only handle free text placed over the PDF, without interacting with the actual form fields. In contrast, Foxit Reader, PDFelement, and Adobe Acrobat detect and fill native fields, including checkboxes and dropdown menus.
OCR and Scanned Forms: The Criterion That Distinguishes PDF Tools
A PDF form can come in two radically different forms. An interactive PDF contains directly usable fields. A scanned PDF (image) contains no fields: the tool must recognize the text via OCR (optical character recognition) before it can be filled out properly.
On this point, free tools fall short. Most free web versions do not offer OCR. You can type text over the image, but without alignment with the original form fields, and without the ability to search the text later.
- Adobe Acrobat Pro includes an OCR engine capable of converting a scan into a fillable interactive form, with automatic field detection
- Foxit Reader offers OCR in its paid version (Foxit PDF Editor), with reasonable accuracy on documents in French
- PDFelement includes OCR from its standard paid version, supporting multiple languages
- JetSign and integrated iOS tools have no OCR functionality
Without OCR, filling out a scanned form amounts to overlaying text on an image, which poses archiving and readability issues. For professionals dealing with digitized paper documents, this criterion immediately eliminates half of the available applications.
Mobile Application or Web Tool: Which Format for Which Use
The choice between a mobile application (Android, iOS) and a web tool accessible from a browser depends on the type of form being processed. On mobile, input remains smooth for short forms: signing a contract, validating an order form. Conversely, a long form with multiple fields (administrative declaration, application file) is filled out more efficiently on desktop or via a web tool.
On iOS, the integrated Mail and Files functions allow you to sign a PDF without a third-party application, via the markup menu and then the “Signature” tool. This native functionality creates direct competition for dedicated applications for simple uses. On Android, no system equivalent exists: a third-party application remains necessary.
- Occasional use (quick signature, annotation): native iOS functions or JetSign are sufficient
- Regular use with interactive forms: Foxit Reader or PDFelement offer a good balance
- Professional use with compliance and protection requirements: Adobe Acrobat remains the only one to cover the entire spectrum
The criterion that truly separates these tools is not the interface or the price, but the ability to treat a PDF form as a structured document rather than as a simple image to annotate. Applications that detect native fields, offer OCR for scans, and manage multiple signature levels meet a documentary need. The others remain disguised annotation tools posing as PDF editors.
