Overview
The sign pro PDF API adds handwritten electronic signing of PDF documents to software you already run. Where the signature SDK gives you raw capture and leaves the document handling to you, the API handles the document itself: it takes the PDF, presents it for signing, embeds the handwritten signature with its biometric data, and returns a signed file — all triggered from your own application, with your own interface around it.
That makes it the right choice when the signing has to happen inside an existing business system. A contract generated in your CRM, an insurance claim raised in a policy platform, a consent form produced by a hospital system: the user stays where they are, signs on a Wacom pad or a tablet screen, and the signed PDF returns to the workflow automatically. Nothing is printed, scanned or re-filed, and the signing experience people are familiar with is preserved.
The Enterprise API is available for Windows, iOS and Android, so branch, desk and field workflows can share one signing standard. It pairs with the sign pro PDF application, and organisations frequently run both — the app for ad-hoc documents that do not warrant integration, the API for the high-volume processes that do. Financial services, healthcare, government, insurance, logistics and hospitality are its most common homes, typically for contracts, consent capture and proof of delivery.
Where it is not the answer: if you need signature capture without any PDF involved — writing signature data straight into your own database or a non-PDF record — the Wacom Ink SDK for signature is the leaner fit. Integration work is also genuinely required here; this is not a plugin you install, and we scope that work as part of the solution.
sign pro PDF API at a Glance
| Purpose | Handwritten e-signing of PDF documents from within an existing application |
|---|---|
| Platforms (Enterprise API) | Windows, iOS, Android |
| Integrates with | CRM, ERP, contract management and other line-of-business systems |
| Signature type | Handwritten, with biometric data captured during signing |
| Signature format | ISO signature format supported |
| Security | Built-in encryption of signature data |
| Companion product | sign pro PDF application (standalone, Windows) |
| Typical sectors | Financial services, healthcare, government, insurance, logistics, hospitality |
| Typical documents | Contracts, consent forms, claims, delivery confirmations, account opening |
| Paper removed from | Printing, signing, scanning and archiving steps of the document process |
| Best suited to | Organisations digitising a high-volume, document-driven signing process |
Which Wacom SDK Do I Need?
Five Wacom products cover signing, and they are not interchangeable. This table is the short version of the advice we give clients before any integration work is scoped.
| Product | Use it when you need to… | Platforms | Development effort |
|---|---|---|---|
| Wacom Ink SDK for signature | Capture a handwritten signature with biometric data inside your own application | Windows, iOS, Android | Moderate – you build the surrounding workflow |
| sign pro PDF API | Sign complete PDF documents from an existing CRM, ERP or contract system | Windows, iOS, Android | Light to moderate – document handling is provided |
| sign pro PDF app | Sign and fill PDFs by hand with no integration at all | Windows | None – install and use |
| Wacom Ink SDK for verification | Check whether a signature matches reference samples already on file | See product page | Moderate – scoring integrated into your process |
| Wacom Ink SDK for ink | Capture, store and replay digital ink generally – notes, annotation, forms | Multiple | Moderate to high – a toolkit, not a solution |
Use it when you need to…
- Wacom Ink SDK for signature
- Capture a handwritten signature with biometric data inside your own application
- sign pro PDF API
- Sign complete PDF documents from an existing CRM, ERP or contract system
- sign pro PDF app
- Sign and fill PDFs by hand with no integration at all
- Wacom Ink SDK for verification
- Check whether a signature matches reference samples already on file
- Wacom Ink SDK for ink
- Capture, store and replay digital ink generally – notes, annotation, forms
Platforms
- Wacom Ink SDK for signature
- Windows, iOS, Android
- sign pro PDF API
- Windows, iOS, Android
- sign pro PDF app
- Windows
- Wacom Ink SDK for verification
- See product page
- Wacom Ink SDK for ink
- Multiple
Development effort
- Wacom Ink SDK for signature
- Moderate – you build the surrounding workflow
- sign pro PDF API
- Light to moderate – document handling is provided
- sign pro PDF app
- None – install and use
- Wacom Ink SDK for verification
- Moderate – scoring integrated into your process
- Wacom Ink SDK for ink
- Moderate to high – a toolkit, not a solution
Not sure which fits your process? Talk to our integration team — we scope this against your actual systems before recommending anything.
Frequently Asked Questions
What is the sign pro PDF API used for?
It adds handwritten electronic signing of PDF documents to applications you already use, such as a CRM, ERP or contract management system. Your application calls the API, the document is signed on a Wacom pad or tablet, and a signed PDF returns to the workflow.
Which platforms does the sign pro PDF Enterprise API support?
Windows, iOS and Android. That lets counter staff, office users and field teams sign through the same integration rather than needing separate tools for each environment.
How is the API different from the sign pro PDF app?
The app is a standalone program someone opens to sign a document. The API embeds that capability into your own software, so signing happens inside your existing process with your own interface. Many organisations use both.
Do signatures captured through the API include biometric data?
Yes. The handwritten signature is captured with the biometric detail of how it was made, and the ISO signature format is supported, so the signed document carries evidence that supports later verification.
Can it work with our existing CRM or ERP?
In most cases yes — the API is designed to be called from line-of-business systems, and integration effort is usually modest. We scope this against your specific platform before recommending it, since the work depends on how your system handles documents.
Is any development work required?
Yes. This is an API, not an installable plugin, so your development team or ours connects it to your application. If you want signing without any development, the standalone sign pro PDF app is the alternative.
Want handwritten signing inside your CRM, ERP or document system? Request a consultation and we will map the integration against your platform and volumes.