Contracts
Proposals, addendums and commercial terms.
PDF for business
Digital signing for contracts, HR, legal and operations in one endpoint
Use the same workflow for internal and external PDF documents, with simple or visible signatures, local or cloud certificates, and auditable responses.
Connector JS | PDF
const connector = createSignerConnector({
apiBaseUrl: 'https://4signer.com/api',
bearerToken: 'ACCOUNT_TOKEN'
})
const result = await connector.sign({
documentId: 'contract-2026-001',
documentType: 'pdf',
certificateMode: 'cloud',
documentFile: pdfFile,
requestOptions: { visibleSignature: true }
})Top scenarios
HR
Onboarding, leave forms and internal records.
Legal
Agreements and legal process documents.
Operations
Checklists, approvals and operational forms.
Served industries
Deploy the same PDF signature pattern across multiple verticals.
HR
Onboarding and routines
Hiring, leave, internal notices and records.
Legal
Agreements and terms
Structured signing flow for legal and admin files.
Real estate
Leasing and proposals
Contracts, inspections and operation documents.
Finance
Formalization and acceptance
Credit, renegotiation and compliance documents.
Ready to scale PDF signing?
One integration for multiple use cases with legal validity and traceability.