Digital signature API for on-premise PDF signing.
Deploy SignLift on your own servers to sign PDFs generated by your ERP, CRM, or business application. Configure certificate-based signing and placement, then return the signed document to your workflow.
Your infrastructure. Your signing service.
PDF signing,
inside your deployment.
Three steps.
PDF signing on your own servers.
Send a PDF from your application to your customer-hosted SignLift service, apply a certificate-based signature, and store the returned document in your business workflow.
Your app sends a PDF
Your application prepares the PDF and sends it to SignLift on your own server. Agree file limits, authentication, and request handling for the deployment.
Authenticated requestSignLift applies the signature
The service applies the configured signing certificate and signature placement to the PDF. Test representative documents before enabling production workflows.
Your certificatesYour app receives the signed PDF
Store the signed PDF with its business record and check its digital signature in a compatible reader. Handle failed requests and retries in your application.
Signed PDF outputPerformance planning
Size the integration using representative PDF files and peak signing volume.
Processing strategy
Discuss request limits and design queueing and retry behaviour around the supported API.
Transport security
Configure encrypted transport and restrict access to the signing service and credentials.
You decide where
the signature lands.
Two intelligent placement strategies to handle any document structure. From rigid government forms to dynamic, template-generated contracts.
Coordinate Placement
Pixel-perfect precision
Specify exact X/Y coordinates and page number. Ideal for standardized documents where the signature always goes in the same spot: invoices, purchase orders, and government forms.
Text Search
Find text, sign beside it
SignLift scans your PDF for anchor text like "Authorized Signatory" and places the signature relative to it. Perfect when layouts vary but the anchor text stays consistent.
Built for enterprises
running their own signing service.
Run SignLift on your own infrastructure and connect it to your business applications. Plan certificate management, network access and audit retention with your technology team.
Process PDFs on your own servers
Data flowSignLift is deployed on customer-hosted servers. Your team defines the server environment, document storage, temporary files, backups, and access controls for PDF signing.
Plan certificate management
Key storageConfirm supported certificate formats, storage, permissions, renewal, and revocation handling. Keep private keys and signing credentials accessible only to authorised services.
Review network dependencies
ConnectivityCertificate status checks, timestamp services, and Aadhaar eSign can require external connectivity. Review each selected signing method and network dependency before planning an isolated environment.
Define the audit record
Audit needsAgree the events, retention periods, and access controls required for your signing workflow. Link signed documents to the originating business transaction and define failure monitoring.
Put it into practice
Build PDF signing into your business application
Deploy SignLift on your own servers and connect it to the application that generates your PDFs. Start with the document flow, certificate and infrastructure requirements.
Define the integration boundary
Identify where your ERP or CRM generates the final PDF, which customer-hosted server runs SignLift and where the signed file should return. Confirm the supported application version and integration pattern with your development team.
Configure signing and placement
Choose the signing certificate and decide whether a fixed position or text anchor suits the document. Validate the output using representative PDFs before processing production documents.
Plan for production
Agree on authentication, key storage, throughput, failed requests and audit retention. Review outbound connections separately for Aadhaar authentication, certificate checks and timestamp services.
Frequently asked questions
Everything you need to know about SignLift's server-side PDF signing API.
What is SignLift?
SignLift is a customer-hosted digital signature API for PDFs. Deploy it on your own servers, send a PDF from your application to your SignLift endpoint, specify signature placement, and receive the signed PDF. Plan certificate storage, access controls and network requirements for your deployment.
Is SignLift on-premise or hosted by SignSecure?
SignLift supports customer-hosted, on-premise deployment only. Your organisation provides the server environment for PDF signing. Review infrastructure sizing, certificate storage, backups, monitoring, and required external connections during implementation.
What signing certificate types are supported?
SignLift supports PFX/P12 certificate files and server-side signing certificates. Your signing certificate is configured for the deployment and used for PDF signing operations. USB DSC tokens are not supported directly. For USB token signing, use SignBolt (desktop) or SignBridge (browser-to-token bridge).
How does text-search placement work?
Text-search placement scans the PDF for a specific text string (like "Authorized Signatory" or "Sign Here") and places the digital signature relative to that text. You can configure X/Y offsets from the found text position. This is ideal for documents where the layout varies but anchor text is consistent, such as template-generated invoices or contracts.
What are the file size and rate limits?
File size, batch size and request limits depend on your deployment. Share sample PDFs, expected daily volume and peak throughput with our team so the integration can be sized and tested.
Is the API suitable for high-volume production use?
SignLift supports automated PDF signing workflows. Test representative document sizes and volumes in your chosen deployment, and agree on throughput, error handling and support requirements before production use.
How is authentication handled?
Authentication is configured for your API deployment. Keep credentials on the application backend and request the current authentication documentation and evaluation setup from our team.
What does pricing look like?
Request a quote based on your deployment, expected signing volume and support requirements. Confirm the billing unit, any minimum commitment and evaluation terms before integrating.
Can I verify signatures through the API?
Yes. The /v1/verify endpoint accepts a signed PDF and validates the digital signature integrity, certificate chain, and timestamp. It returns detailed verification results including the signer identity, signing time, certificate validity, and whether the document has been tampered with after signing.
Your documents deserve
real signatures.
Bring a sample PDF and your server requirements. Review certificate support, signature placement, on-premise deployment, and evaluation access with our team.
PDF signing · Certificate configuration · Integration planning