Best eSignature APIs for Windows

Foxit eSign is a secure, web-based legally binding HIPAA Compliant e-signature software for companies of all sizes. Simple and easy-to-use, Foxit eSign enables organizations to easily create documents, send these to the signers for e-signatures, and archive them. Foxit eSign features a robust and reliable website integration via APIs and a collaboration tool that helps multiple team members around the globe to seamlessly work on a single contract document.

Keep your business moving forward with a leading secure electronic signature system. Generate documents, negotiate contracts, accept payments, and create automated workflows. E-Sign is a leading global provider of electronic signature solutions. Our eSignature platform accelerates agreements, eliminates manual tasks, and makes it easy to connect with the tools and systems you’re already using. Agreements are everywhere in everyday life. From sales contracts and offer letters to account openings and invoices. E-Sign’s eSignature solution gives you have the ability to complete contracts, approvals, and other agreements in minutes. And because E-Sign can fit into your digital ecosystem, you can extend these benefits to other stages of the agreement process, such as preparing, acting on, and managing agreements.

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.

Collect digital signatures anywhere. Simplify your document workflows with Formstack Sign, a digital signature automation solution that lets you gather signatures on any device. Accessible electronic signatures. Avoid the bottlenecks associated with waiting for eSignatures. With digital document signing, users can eSign documents using a computer, tablet, or mobile phone. From contract to deal, you can quickly connect the dots with Formstack Sign. Powerful digital signature automation features. Collect signatures on the go. Easily collect mobile signatures from prospects, customers, or coworkers by sending documents for signature via text message. Create custom documents in minutes. Use Formstack Documents to eliminate paperwork and transform data into beautifully designed documents you can send anywhere. eSignature Drag-and-Drop Builder With our intuitive drag-and-drop builder, you won't need your IT department to prepare your documents for signature. Customizable Templates Quickly.

The easiest secure platform to exchange, retrieve or even sign confidential documents (up to 2.5G of files per email) without compromising sensitive information inside and outside your organization. Our technology offers its users the possibility to add layers of security to their emails exchanges by limiting the number of times they are read, their lifespan or by adding SMS codes or passwords to be sent to their recipients with ease. Because today's online world is a highly vulnerable environment, choose an innovative and secure tool that is unique in the world of computer security. Whether you want to send or receive emails containing large, confidential attachments or documents to be signed. Exchange passwords, credit cards, financial statements, tax returns, incident reports or any information you deem confidential via email. Our technology is there to serve your organization.

Firma is the developer-first e-signature API for startups and SaaS companies. Clean REST API, embeddable editors, and fast integration — ship e-signature workflows in hours. Pay-as-you-go at just €0.029 per envelope. No minimums, no contracts, no surprises. Every customer gets a dedicated workspace with secure template and document separation. Aligns with ESIGN, UETA, HIPAA, GDPR, and eIDAS. No demos, no sales calls — just sign up and start building.

Legalesign is UK-based enterprise software to send, sign and manage documents online. Companies use Legalesign to gain significant productivity and financial benefits, increase their customers' satisfaction by removing the need for a printer and enabling them to sign from anywhere and, last but not least, relieve the burden of tiresome paperwork upon long suffering staff everywhere.