Extend AI has open-sourced a UI kit called Extend UI, featuring 14 components for building document processing applications with support for PDF, DOCX, and XLSX viewers, along with features like bounding box citations, file upload, and e-signature. The MIT-licensed toolkit was developed internally to address gaps in existing solutions and has been battle-tested at scale, processing millions of pages daily. The release aims to help developers build document processing agents and user-facing document intake flows more efficiently.
Background
Document processing and management is a critical need for many applications, but building robust, scalable document viewers with advanced features has historically been challenging for developers. Many existing solutions lack comprehensive functionality or polish, leading companies to build custom solutions.
- Source
- Hacker News (RSS)
- Published
- Jun 11, 2026 at 12:09 AM
- Score
- 6.0 / 10