Freedom251 › Digital Signature API Software
emSigner API
What emSigner API is
emSigner API lets organizations send document-signing requests through REST endpoints. Its API covers user, workflow, and document management, with JWT authentication for requests. Each envelope can contain up to 10 documents with a combined file size of 25 MB. Billing is based on envelopes consumed and successful transactions in which every party signs the documents. The API supports Simple, Advanced, and Qualified Electronic Signatures. Workflows can place signature fields by coordinates or search text, add signatories and reminders, and apply PDF protection or watermarks. Named integrations include Salesforce and SAP, and CRM or ERP systems can use outbound REST calls. Deployment choices include AWS-hosted cloud with multiple-region data residency and on-premise installations. The maker lists Android, iOS, web, API, and self-hosted platforms. A 30-day free trial is described, but there is no free plan. Professional API envelope pricing is $0.99, paid once; Essential is $1, paid once. The API pricing page lists 24x7 support with a response-time SLA under 12 hours.
Who it suits
It suits organizations that want to connect document-signing workflows to their own systems, including CRM or ERP environments. The listed deployment options also accommodate organizations considering cloud or on-premise hosting.
What it does well
- REST endpoints for user, workflow, and document management
- Supports three electronic signature types
- Envelopes hold up to 10 documents
- AWS cloud and on-premise deployment options
- 30-day free trial
What to know first
- No free plan is listed
- Envelope file size is capped at 25 MB
- Professional pricing is contact-for-pricing
- Sandbox access requires contacting emSigner
Limits
The 30-day free trial is the available trial option; there is no free plan. An envelope holds up to 10 documents and 25 MB total, and the Professional API envelope is valid for one year.
Plans
| Plan | Billed and limits | Price |
|---|---|---|
| Professional API envelope plan | USD 0.99 /envelope; envelopes are valid for one year · professional plan · API access · envelope is valid for one year | $0.99, paid once |
| Essential | USD 1 /envelope · API envelope pricing shown alongside Essential · API features are listed under Professional | $1, paid once |
| Professional | For Pricing Contact Us · Large teams · automation · integrations · enterprise security | On request |
As emsigner.com lists them, read 2 Oct 2026. The maker's own page has the final word.
Getting started
- Visit https://emsigner.com/.
- Review the API documentation and select an envelope plan.
- Start the 30-day free trial, or contact emSigner for demo or sandbox access.
- Connect using REST API endpoints and JWT authentication.
- Configure the signing workflow and deployment option.
Verdict
emSigner API provides signature workflows, controls, and deployment choices for organizations integrating signing into their systems. Review envelope limits and per-envelope billing, and contact the maker if you need sandbox access or Professional pricing.
Questions
Does emSigner API have a free plan?
No. A 30-day free trial is described.
How much does an API envelope cost?
The Professional API envelope plan costs $0.99 per envelope, billed once, and each envelope is valid for one year. Essential is listed at $1 per envelope, billed once.
Which platforms are supported?
The listed platforms are Android, API, iOS, self-hosted, and web.
What signature types does the API support?
It supports Simple, Advanced, and Qualified Electronic Signatures.
Can it integrate with Salesforce or SAP?
The maker names Salesforce and SAP connectors and describes outbound REST calls from CRM or ERP systems.
Can I use a sandbox?
The developer center says demo or sandbox access requires contacting emSigner.
Facts from emSigner API's own pages
- API structure
- API endpoints cover user management, workflow management, and document management, and requests use JWT authentication. · support.emsigner.com, 2 Oct 2026
- Encryption
- The trust center states that stored PII and documents are encrypted with AES-256 and API communications use HTTPS/TLS 1.2 or higher. · developers.emsigner.com, 2 Oct 2026
- Envelope billing
- API pricing is based on envelopes consumed and successful signing transactions in which all parties sign the included documents. · support.emsigner.com, 2 Oct 2026
- Envelope size
- An envelope can include up to 10 documents with a total file size of 25 MB. · support.emsigner.com, 2 Oct 2026
- Founded
- 2008 · emsigner.com, 28 Sept 2026
- Headquarters
- Bengaluru, Karnataka, India · emsigner.com, 28 Sept 2026
- Hosting and deployment
- The API and Gateway are available in AWS-hosted cloud with multiple-region data residency, and the maker says it also supports on-premise deployments. · developers.emsigner.com, 2 Oct 2026
- Integrations
- The maker names Salesforce and SAP connectors and describes using outbound REST calls from CRM or ERP systems. · developers.emsigner.com, 2 Oct 2026
- Intended users
- The maker describes emSigner as a secure eSignature workflow solution for companies of different sizes and for workflows involving employees, vendors, and customers. · developers.emsigner.com, 2 Oct 2026
- Purpose
- The REST API lets organizations send document-signing requests to emSigner through API endpoints. · support.emsigner.com, 2 Oct 2026
- Security certifications
- The trust center lists SOC 2 Type II, ISO 27001:2022, and ISO 27018:2014 certifications. · developers.emsigner.com, 2 Oct 2026
- Signature types
- The API supports Simple, Advanced, and Qualified Electronic Signatures. · developers.emsigner.com, 2 Oct 2026
- Signing controls
- API workflows can use signature placeholders placed by coordinates or search text and can include signatories, reminders, PDF protection, and watermarks. · support.emsigner.com, 2 Oct 2026
- Support
- The API pricing page lists 24x7 support with a response-time SLA under 12 hours. · qa-core.emsigner.com, 2 Oct 2026
- Trial and sandbox
- The pricing page describes a 30-day free trial, while the developer center says demo or sandbox access requires contacting emSigner. · qa-core.emsigner.com, 2 Oct 2026
Where emSigner API stands on Freedom251
- Digital Signature API Software#19 of 28