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Extend UI

Open-source UI kit for modern document apps

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  • Extend UI: screenshot 1

About

React components for PDF, DOCX, XLSX, and CSV viewers, with bounding box citations, file upload, e-signing, and more.

Open source: the code is at github.com/extend-hq/ui.

First shown on Hacker News on 10 June 2026 as “Extend UI – open-source UI kit for modern document apps”, where it reached 252 points and 81 comments. Read the discussion.

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