Add legally valid digital signatures to PDF documents

Signs PDF contracts and invoices with a legally recognized digital certificate, automatically and securely.

How the work actually flows

A straight line.

Pattern: Sequence (1)

flowchart TD trig(("submit PDF and certificate")):::human s0["Apply cryptographic signature"]:::svc s1["Select signature strength"]:::task s2["Return signed PDF"]:::task trig --> s0 s0 --> s1 s1 --> s2 out[/"Digitally signed PDF returned"/]:::out pay{{"Legally valid signatures without a third party"}}:::pay s2 --> out out --> pay classDef task fill:#e7f6fe,stroke:#34b8f0,color:#2c2a29 classDef svc fill:#f6f8fa,stroke:#7c8795,color:#2c2a29 classDef mi fill:#e7f6fe,stroke:#0079a8,color:#2c2a29,stroke-width:2px classDef human fill:#fff,stroke:#0079a8,color:#0079a8 classDef store fill:#f6f8fa,stroke:#0079a8,color:#2c2a29 classDef trig fill:#00a4eb,stroke:#0079a8,color:#fff,font-weight:bold classDef trigtime fill:#00a4eb,stroke:#0079a8,color:#fff,font-weight:bold classDef trigdata fill:#8ad4f5,stroke:#0079a8,color:#06314c,font-weight:bold classDef gate fill:#fff,stroke:#e8a23d,color:#6b4708,font-weight:bold classDef out fill:#1f9d6b,stroke:#167a53,color:#fff,font-weight:bold classDef pay fill:#06314c,stroke:#021f33,color:#fff
A stepAn outside serviceA personResultPayoff
Build size
Advanced

A larger build with multiple systems, AI reasoning, and custom rules.

Business functions
Document Processing & OCRAPI & Webhook IntegrationSecurity & Compliance
Connects
open-pdf-sign

The problem it solves

Getting contracts and invoices signed with a legally valid digital signature usually means a manual process or an expensive third-party signing service. You need signatures that will actually hold up for compliance and audits, not just an image pasted on a page.

Who it fits

Businesses that need legally compliant digital signatures on contracts, invoices, or other official documents.

How it works

  1. A PDF, digital certificate, and password are submitted to the system
  2. The certificate is used to apply a cryptographic signature to the document
  3. You choose the signature strength, from basic to long-term archival validity
  4. The signed, tamper-evident PDF is returned to you
What you get

Signatures that hold up if anyone ever asks

Your contracts and invoices get a legally recognized digital signature applied automatically and securely.

What you get

A digitally signed PDF that meets EU eIDAS standards for legal and audit purposes.

What you need

An X.509 digital certificate and a server capable of running the signing service.

We can build this. But should you?

The hard question is not how to build it. It is whether this is the right thing to build first.

That is what a Fractional Chief AI Officer figures out with you, before anyone writes a line of code.

Let's Talk Strategy

Related automations

Download large batches of images from websites safely

Downloads large numbers of images from a website in controlled batches, logging every step so nothing gets missed or overloaded.

Advanced

Automatically review and route legal policy submissions

AI reviews submitted policies, checks compliance, and routes approvals to Slack, Gmail, and Google Sheets automatically.

Advanced

Redact personal data from documents before sending them to AI

The system hides names, emails, and ID numbers in a document before AI ever sees them, then restores them if needed.

Advanced

Analyze contracts and flag risky clauses automatically

Upload a contract PDF and get an AI summary of the content with risky clauses flagged, emailed to you and logged for tracking.

Advanced
Back to the AI Playbook