Best eSignature APIs for Microsoft 365

Find and compare the best eSignature APIs for Microsoft 365 in 2026

Use the comparison tool below to compare the top eSignature APIs for Microsoft 365 on the market. You can filter results by user reviews, pricing, features, platform, region, support options, integrations, and more.

  • 1
    airSlate SignNow Reviews

    airSlate SignNow

    airSlate

    $8 per user per month
    6 Ratings
    SignNow is an electronic signature from airSlate that allows business to be conducted anywhere and anytime on any device. SignNow is the best solution for SBMs and mid-markets thanks to its intuitive interface, transparent pricing, flexible configuration, and ease of API integration. Sign documents online. Generate agreements, negotiate contracts and accept payments using legally-binding electronic signatures. The airSlate SignNow intuitive interface allows users to create an airSlate SignNow account, upload documents, eSign and send them for signing within minutes. No training or downloads are required. Renewing your subscription can be expensive. You only pay for the services you use with airSlate SignNow. There are no hidden fees for extra templates or sends. Improve team collaboration and close deals faster, in person or remotely. Get complete visibility of the document signing process with advanced functionality tailored to meet your needs.
  • 2
    Adobe Acrobat Sign Reviews
    Enhance and accelerate your workflows with Acrobat Sign, the exclusive e-signature solution that combines the robust capabilities of Adobe Acrobat into one comprehensive tool. You can access and sign Acrobat PDF documents effortlessly from any location, utilizing either your mobile device or desktop. Your recipients enjoy a seamless signing experience with no need for downloads or sign-ups, making the process quick and efficient. Furthermore, easily scan and upload PDFs with the free Adobe Scan mobile application available on your device. Join the ranks of over 500,000 organizations that are enhancing customer interactions through the powerful features of electronic signature software and Acrobat PDF functionalities. Adobe simplifies the process of creating, editing, collaborating, e-signing, and sharing PDFs across all devices. You can select from various scalable document signing solutions tailored to your specific business requirements, whether you need PDF document management or not. Notably, Acrobat Sign is recognized as Microsoft's preferred e-signature solution, integrating seamlessly with the extensive suite of Microsoft applications, allowing you to send and sign PDFs directly within your current workspace. This integration significantly boosts productivity and streamlines document workflows for users.
  • 3
    E-Sign Reviews

    E-Sign

    E-Sign

    £10 per month
    2 Ratings
    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.
  • 4
    OneSpan Sign Reviews

    OneSpan Sign

    OneSpan

    $20.00/month/user
    2 Ratings
    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.
  • 5
    Formstack Sign Reviews

    Formstack Sign

    Formstack

    $15.95 per user, per month
    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.
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