No. 18 of 29 ·Digital Signature API Software

emSigner API

Name: emSigner API
Price: 0.99 USD

Web · Android · iPhone · Self-hosted · API

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Freedom report

Two barsScore 5.1

Free tierNo free tier on record
Open codeNo open-source code on record
Runs widely3 of 6 device platforms
DocumentedPlans, terms and facts published

emSigner API is ranked #18 of 29 in digital signature API software on Freedom251. It runs on Android, API, iOS, Self-hosted, Web. There is no free plan. A free trial is offered.

emSigner API plans and pricing

All plans

Professional API envelope plan $0.99 once USD 0.99 /envelope; envelopes are valid for one year professional plan · API access · envelope is valid for one year qa-core.emsigner.com · 2 Oct 2026

Essential $1 once USD 1 /envelope API envelope pricing shown alongside Essential · API features are listed under Professional qa-core.emsigner.com · 2 Oct 2026

Professional Not published For Pricing Contact Us Large teams · automation · integrations · enterprise security qa-core.emsigner.com · 2 Oct 2026

Compared on digital signature API software

Free plan: No
Embedded signing: Yes
Identity verification: Yes
Workflow status API: Yes
Webhook event types: 4
Signed-file retrieval: Yes
Sandbox environment: Yes

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The record

Purpose: The REST API lets organizations send document-signing requests to emSigner through API endpoints.
API structure: API endpoints cover user management, workflow management, and document management, and requests use JWT authentication.
Envelope size: An envelope can include up to 10 documents with a total file size of 25 MB.
Envelope billing: API pricing is based on envelopes consumed and successful signing transactions in which all parties sign the included documents.
Signature types: The API supports Simple, Advanced, and Qualified Electronic Signatures.
Signing controls: API workflows can use signature placeholders placed by coordinates or search text and can include signatories, reminders, PDF protection, and watermarks.
Integrations: The maker names Salesforce and SAP connectors and describes using outbound REST calls from CRM or ERP systems.
Security certifications: The trust center lists SOC 2 Type II, ISO 27001:2022, and ISO 27018:2014 certifications.
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.
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.
Support: The API pricing page lists 24x7 support with a response-time SLA under 12 hours.
Trial and sandbox: The pricing page describes a 30-day free trial, while the developer center says demo or sandbox access requires contacting emSigner.
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.
Founded: 2008

Where it ranks on Freedom251

Best Digital Signature API Software in 2026#18 of 29

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Sources

support.emsigner.com/apis/esignature-rest-api/getting-starte· checked 2 Oct 2026
developers.emsigner.com/support.html· checked 2 Oct 2026
support.emsigner.com/apis/embedded-signing/how-tos/applicati· checked 2 Oct 2026
developers.emsigner.com/trust-center/· checked 2 Oct 2026
qa-core.emsigner.com/subscription/TeamsAndEnterprise· checked 2 Oct 2026
emsigner.com· checked 28 Sept 2026