# Extend UI

> Extend UI: React components for document viewers. For UI Design. Works on Browser. Free to use.

Canonical: https://softwareontheweb.com/product/extend-ui
Last updated: 2026-06-15

## About

**Extend UI is an open-source UI kit designed to help developers build modern document applications with ease, providing a range of React components for viewing and managing various file types. It's ideal for those looking to streamline their document workflows and create more intuitive user experiences.**

When it comes to working with documents, developers often face the challenge of creating a seamless and efficient workflow. Extend helps bridge this gap by offering a set of pre-built components that can be easily integrated into existing applications, allowing users to view, upload, and manage documents in a variety of formats, including PDF, DOCX, XLSX, and CSV.

- [Extend UI homepage showing React components for document viewers](https://softwareontheweb.com/storage/product_media/medium_extend-ui-homepage-screenshot.webp)
### Who is it for?

Developers building document management applications, looking for a set of pre-built components to simplify their workflow. Businesses that need to integrate document viewing and management into their existing applications or workflows. Teams working on internal tools or agents that require document upload, viewing, and management capabilities.


## Features

- React components for viewing PDF, DOCX, XLSX, and CSV files, making it easy to integrate document management into your application.
- File upload capabilities, allowing users to easily add new documents to your application.
- E-signing functionality, enabling users to sign documents electronically and streamlining workflows.
- Bounding box citations, providing a way to highlight and reference specific sections of a document.
- A schema builder, giving developers the flexibility to customize the structure of their documents and data.

## Use cases

- UI Design
- Building a document management system that allows users to upload, view, and manage files in various formats.
- Creating a workflow that includes e-signing and bounding box citations for document review and approval processes.
- Developing an application that requires integration with existing document management systems or tools.

## Details

| Field | Value |
| --- | --- |
| Pricing | Free |
| Built for | Designers (UX) |
| Platforms | Browser |
| Categories | UI Library |
| Built with | Next.js, React |

## More details

### **What is Extend?**

Extend is a collection of React components that enable developers to build modern document applications with features like file upload, e-signing, and bounding box citations. It fits into a user's workflow by providing a set of reusable components that can be easily dropped into user-facing flows, agents, or internal tools.

### **How does Extend compare to alternatives?**

- Unlike other document management libraries, Extend provides a set of pre-built React components, making it easier to integrate document viewing and management into your application.
- Compared to custom-building document management functionality, Extend offers a more efficient and cost-effective solution, allowing developers to focus on other aspects of their application.

### **What integrations and ecosystem support does Extend offer?**

- The available source material does not clearly specify integrations, but as an open-source UI kit, Extend is likely to be compatible with a range of React applications and frameworks.

### **What are the pros and limitations of Extend?**

- **Pros:** Easy to integrate; provides a set of pre-built components for document management; offers features like e-signing and bounding box citations.
- **Limitations:** Not clearly stated in the available source material.
- [github.com](https://github.com/extend-hq/ui)

## Related
- [Home](https://softwareontheweb.com/)
- [Topics](https://softwareontheweb.com/topics)
- [Official website](https://extend.ai/ui)
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