Best Free eSignature APIs

Foxit eSign is a secure, web-based, legally binding, HIPAA-compliant e-signature solution designed for organizations of all sizes. Easy to use and deploy, it enables businesses to create documents, send them for e-signatures, and securely archive them. Foxit eSign also offers robust API integrations and collaboration tools that allow teams across multiple locations to work seamlessly on the same contract or document. While many eSignature solutions focus only on signing, Foxit eSign integrates with Foxit Document Management System (DMS) to provide a connected workflow for signing, storing, organizing, and managing documents from start to finish.

PandaDoc empowers more than 50,000+ growing organizations to thrive by taking the work out of document workflow. PandaDoc provides an all-in-one document automation platform that helps fast scaling teams accelerate the ability to create, manage, and sign digital documents including agreements, proposals, quotes, contracts, and more. Powerful, integrated, and secure, PandaDoc enables business users to create and send personalized documents for electronic signing in under 4 minutes. The five main use cases of PandaDoc are: - Proposals - Quotes - Contracts - eSignatures - Forms. PandaDoc seamlessly integrates with the existing software you use, like CRM, payment gateway, cloud storage. We support the tools highly effective teams use, like Zoom, Canva, Monday, HubSpot, and SalesForce. Moreover, our robust API and Zapier integration could connect PandaDoc with any custom software you may use.

Docusign is a cutting-edge cloud-based electronic signature solution that empowers companies of all sizes to send, sign, and manage agreements anytime, anywhere, and on any device. Trusted by more than 250,000 companies in 188 countries, Docusign enables users to sign various types of documents such as school permission slips, business contracts, agreements, and approvals. Docusign also enables users to send and sign documents in multiple languages and provides a mobile application for Android, iOS, and Windows devices. If your organization executes notarial acts, Docusign eNotary makes the notarization process fully digital for all parties involved: senders, signers, and notaries. It enables a Notary Public to act as an in-person witness to electronic signing of documents.

OneSpan Sign is a secure and reliable electronic signature solution that powers some of the world's most trusted brands. Top analyst firms and regulated industries recognize OneSpan Sign as a flexible and scalable solution that enables them to manage identities, secure access, verify transactions, and protect assets across the enterprise, financial, e-commerce, government, and healthcare markets. Available in the cloud or on-premises, OneSpan Sign seamlessly captures signatures at the point of sale (POS), in the field, or on websites.

Today, we are thrilled to announce that Signeasy is now a part of the Recommended for Google Workspace apps, a select list of market-leading third-party applications that help Google Workspace customers collaborate and get more done. Users can assess which Google Workspace Marketplace apps are more secure, reliable, and well-integrated with Google Workspace services by looking for the Recommended for Google Workspace label. Signeasy API is built for developers who are looking to integrate eSignature capabilities into their core workflows. You can easily build custom eSignature workflows for your own site or application with our easy-to-integrate API platform. In addition to that, Signeasy offers powerful integrations with popular business and productivity tools like Salesforce, Google Workspace, Microsoft Teams, Outlook, and more, helping developers build end-to-end document workflows. Signeasy’s rich set of API endpoints enables complete control over your documents' eSignature.

BoldSign is Syncfusion's electronic signature platform and API for sending, signing, and tracking legally binding documents. Unlimited signature requests start at $15 per user per month, billed annually, with no envelope caps or overage charges. Upload PDF or Word files, add signature and form fields, set the signing order, and send. Signers need no account or download. Reusable templates, automatic reminders, and live status tracking keep documents moving. Completed documents include a tamper-evident audit trail with signer details and timestamps, designed to support legal enforceability under ESIGN and eIDAS. BoldSign supports SOC 2 Type II, eIDAS, GDPR, PCI DSS, the ESIGN Act, HIPAA, qualified electronic signatures, and data residency in the US, EU, Canada, and Australia. Developers can embed sending and signing directly in their applications. The REST API supports templates, text tags, custom branding, webhooks, SDKs, and a free sandbox.

RocketSign is a digital signature solution by Rocket Lawyer that enables users to create, send, sign, and store legally binding documents entirely online, simplifying contract workflows without the need for printing or in-person signing. It allows users to upload documents in formats such as PDF or Word, add signature, initial, and date fields, and send them to others for signing via email, all within a streamlined interface accessible from any device. It supports multi-party signing, tracks when documents are signed, and stores completed agreements securely for easy access and recordkeeping. RocketSign integrates directly with Rocket Lawyer’s document creation tools, enabling users to generate, edit, and sign legal documents in one place, while also offering optional attorney review for additional confidence in legal accuracy. It records timestamps and maintains clear attribution of signatures, helping ensure compliance with electronic signature laws.