/Tech1d ago

Extend Releases Open-Source UI Components For Document Agents

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Original postjason#972
Kushal Byatnal@kushalbyatnal

Introducing Extend UI — open-source components for document agents

- 14 components & examples for PDF, DOCX, and XLSX viewers, plus bounding box citations, file upload, e-signature, and more - fully customizable - MIT licensed

when we started, we tried every file viewer and document component library we could find

unfortunately, none of them had all the functionality (and polish) that we wanted, so we ended up building our own for @ExtendHQ

it was only ever meant to be internal, but enough customers kept asking for it that we decided to give it back to the community

it's useful for building agents, user-facing document flows, or internal tools

we use and maintain it for Extend ourselves, so it'll keep getting better over time (and it's battle tested on millions of pages running through our system every day)

it also works with design system agents like @magicpatterns for faster exploration and prototyping

available today on the @shadcn component registry! some examples in 🧵

8:31 AM · Jun 9, 2026 · 131.3K Views
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Users praised Extend UI for open-sourcing its document components for AI agents because the ready-made UI elements like PDF citations and Excel viewers save time on previously tedious builds.

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@kushalbyatnal amazing stuff, integrating now. would be awesome if you also shipped a file system viewer so somebody can do a simple web-based file navigator which when you click on an item traverses an index and then opens the actual file with these extend components

1dViews 2.8KLikes 9Bookmarks 3
BOOKMARKS13LIKES19
Kushal Byatnal@kushalbyatnal

available here today: https://ui.extend.ai/

1dViews 605Likes 19Bookmarks 13
RETWEETS1
Kushal Byatnal@kushalbyatnal

@Teddarific @andrewlu0 the magic patterns animations also go hard 👀

1dViews 213Likes 3
REPLIES2
Kushal Byatnal@kushalbyatnal

@_maxscn lol appreciate it! you can just help us maintain it now 🫡

1dViews 188Likes 1
Kushal Byatnal@kushalbyatnal

React PDF viewer component with bounding box citation support, page controls, zoom, search, text selection, thumbnails, uploads, and responsive document layouts

1dViews 733Likes 13Bookmarks 6
joshpuckett@joshpuckett

@kushalbyatnal so useful! man, the amount of times I've designed these components... so great to have a simple, well-made lib for them 👏

1dViews 679Likes 10Bookmarks 3
Magic Patterns@magicpatterns

@kushalbyatnal Thank you for making it open-source!

One click import for users to explore and prototype with your components:

1dViews 1KLikes 7Bookmarks 3
Kushal Byatnal@kushalbyatnal

React Excel viewer component for previewing XLSX workbooks with sheet tabs, frozen panes, formulas, large-grid navigation, and cell selection

1dViews 590Likes 6Bookmarks 2
Kushal Byatnal@kushalbyatnal

E-Signature component for placing, reviewing, and completing signature fields on PDF documents

1dViews 1.2KLikes 6Bookmarks 1
Kushal Byatnal@kushalbyatnal

React DOCX editor component for editing Word documents with a Word-style toolbar, import and export, formatting controls, page thumbnails, links, images, tables, and tracked changes

1dViews 464Likes 5Bookmarks 1
Jonathan@jbocanegragomez

@kushalbyatnal wow, been working alot in the this space past few months. having to build these from scratch is far from trivial. especially when you consider collaboration/revision. excited to check it out

1dViews 220Likes 4
Kushal Byatnal@kushalbyatnal

@magicpatterns fantastic!

1dViews 585Likes 2Bookmarks 1

@kushalbyatnal Something I need for a client’s project I am building where I need to let them view the cited sources 🤝

1dViews 504Likes 2
Kushal Byatnal@kushalbyatnal

and of course, a massive shoutout to @andrewlu0 who built these!

wouldn't have been possible without him, and it's really his vision come to life

1dViews 465Likes 6
Dan Nelson@danimalnelson

@kushalbyatnal Love all the work people are putting into shared, open source tools so we can all move faster. Nice work.

1dViews 208Likes 4
Mo@MoFromYYZ

@kushalbyatnal Oh wow this is huge. We're going to take a look

1dViews 199Likes 4

@kushalbyatnal extend eng team just loves our customers so much they had to

1dViews 189Likes 4
Teddy Ni@Teddarific

@kushalbyatnal this is fireeee @andrewlu0

1dViews 107Likes 4

@kushalbyatnal oh man these are SO good, great launch guys!

1dViews 226Likes 3
Maximilian@_maxscn

@kushalbyatnal this is so good

i was building exactly this but worse lol

1dViews 210Likes 3
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