Best eSignature APIs for Windows of 2026

Foxit eSign, a web-based legally binding HIPAA compliant e-signature software, is secure and available for all companies. Foxit eSign is simple and easy to use. It allows organizations to create documents, send them to the signers, and then archive them. Foxit eSign offers a reliable and reliable website integration via APIs. It also includes a collaboration tool that allows multiple team members to seamlessly work on a single contract document.

Secure electronic signatures are a key tool to keep your business moving forward. You can create documents, accept payments, and set up automated workflows. E-Sign is a global leader in electronic signature solutions. Our eSignature platform speeds up agreements, eliminates manual tasks, makes it easy to connect to the tools and systems that you already use. Everyday life is awash with agreements. From sales contracts and offer letters, to account openings or invoices, agreements are everywhere. E-Sign's electronic signature solution allows you to quickly complete contracts, approvals, or other agreements. E-Sign can be integrated into your digital ecosystem so you can extend these benefits beyond the initial stages of the agreement process to include preparing, managing, and acting on agreements.

OneSpan Sign offers a dependable electronic signature platform that supports numerous well-known brands globally. Esteemed analyst organizations and regulated sectors regard OneSpan Sign as a versatile and expandable solution, allowing them to control identities, ensure secure access, authenticate transactions, and safeguard assets across various domains, including finance, e-commerce, government, and healthcare. Whether utilized in the cloud or implemented on-site, OneSpan Sign effectively captures signatures at points of sale, in remote locations, or directly on websites, making it a comprehensive tool for modern business needs. Its ability to adapt to different environments makes it a valuable asset for organizations seeking to enhance their signature processes.

Gather digital signatures effortlessly from any location with Formstack Sign, an automated solution designed to streamline your document workflows by enabling signature collection on various devices. With the convenience of electronic signatures, you can eliminate delays caused by the wait for eSignatures, allowing users to sign documents seamlessly on computers, tablets, or smartphones. From initiating contracts to finalizing deals, Formstack Sign makes it easy to connect the necessary elements quickly. This powerful tool offers impressive automation features for digital signatures, even enabling you to collect signatures on the go. Effortlessly obtain mobile signatures from clients, colleagues, or prospects by sending documents for signature through text messages. Furthermore, you can create customized documents within minutes using Formstack Documents, enabling the transition from cumbersome paperwork to elegantly designed files that can be dispatched anywhere. The user-friendly drag-and-drop builder for eSignature ensures that you won't require IT assistance to prepare your documents for signing, and customizable templates can be set up in no time. With these innovative capabilities, Formstack Sign enhances productivity and efficiency in your document management processes.

Discover a user-friendly and secure platform designed for the safe exchange, retrieval, and signing of confidential documents, accommodating files up to 2.5G per email while ensuring the protection of sensitive information both within and outside your organization. Our advanced technology empowers users to enhance the security of their email exchanges by allowing them to control access through various measures, such as limiting the number of reads, setting expiration times, or incorporating SMS codes and passwords for seamless delivery to recipients. In an increasingly vulnerable online landscape, it is essential to opt for a pioneering and secure solution that stands out in the realm of digital security. Whether you aim to send or receive emails with sizeable confidential attachments or need documents signed, our platform is equipped to facilitate the secure exchange of sensitive information like passwords, credit card details, financial documents, tax returns, incident reports, and any other confidential data you wish to share via email. Trust in our cutting-edge technology to meet the needs and security demands of your organization effectively.

Firma.dev offers a flexible pay-as-you-go e-signature API designed specifically for developers. Priced at just $0.029 per envelope, it is significantly more affordable compared to competitors like Docusign or HelloSign, with no hidden monthly fees or setup costs. The platform provides features like embedded signing, customizable template editors, and dedicated customer workspaces for multi-tenant applications, along with clear documentation that allows for quick integration within hours. You can begin developing without any upfront payment or credit card requirement, making it an accessible option for all developers. This cost-effective solution caters to both small projects and larger applications, ensuring scalability and ease of use.

Legalesign, a UK-based enterprise software that allows you to send, sign, and manage contracts online, is available from Legalesign. Legalesign is used by companies to increase productivity and financial benefits, improve customer satisfaction, reduce the need for a printer, allow them to sign from anywhere, and last but not least, ease the burden of tedious paperwork on long suffering staff.