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Extend UI Kit Open-Sourced for Modern Document Applications

kbyatnal· June 10, 2026 View original

Summary

Extend AI has open-sourced its UI kit, offering 14 customizable components for PDF, DOCX, and XLSX viewers, along with features like e-signature and file upload, under an MIT license. The kit was developed internally to address shortcomings in existing document component libraries and is now available for public use.

Extend AI has released its internal UI kit, Extend UI, as an open-source project. This kit provides a comprehensive set of 14 components designed for modern document-centric applications, including robust viewers for PDF, DOCX, and XLSX files. The components also support functionalities such as bounding box citations, secure file uploads, and electronic signatures. Developed out of a need for more polished and functional tools than what was commercially available, Extend UI is now offered under an MIT license, allowing for full customization and integration into various professional workflows. The company maintains and uses this kit internally, ensuring its reliability and scalability for processing millions of pages daily, and hopes for community contributions to further enhance its capabilities.

Why it matters

Professionals building applications that handle documents can leverage this open-source kit to accelerate development, improve user experience, and integrate advanced document processing features without starting from scratch.

How to implement this in your domain

  1. 1Evaluate the Extend UI components to see if they meet specific project requirements for document handling.
  2. 2Integrate selected components into new or existing document-centric applications.
  3. 3Customize the MIT-licensed components to match branding and specific functional needs.
  4. 4Contribute to the open-source community by reporting issues or suggesting enhancements.

Who benefits

Software DevelopmentLegalTechFinTechEdTechHealthcare

Key takeaways

  • Extend UI is an open-source kit for building document applications.
  • It includes viewers for PDF, DOCX, XLSX, and features like e-signature.
  • The kit is customizable and maintained by Extend AI, ensuring quality.
  • It can significantly speed up development for document-heavy applications.

Original post by kbyatnal

"We're open-sourcing 14 components & examples today for PDF, DOCX, and XLSX viewers, plus bounding box citations, file upload, e-signature, and more. It's MIT licensed and fully customizable. Demo video here: https://share.extend.ai/kRmSGKRF When we starte…"

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