Extend UI ships an open source React component library targeting document-heavy applications. The kit covers PDF, DOCX, XLSX, and CSV viewers, file upload interfaces, and e-signing workflows, all in one package.
The scope matters. Most teams stitch together three or four separate libraries to handle document rendering alone. A unified kit with consistent APIs across file types cuts that integration tax significantly.
The full library is worth examining for its e-signing components specifically, a problem space where open source options have historically been thin. Check the component architecture before committing to anything proprietary.
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