A universal layer for web-wide conversation

Turn the entire web into a conversation

Annotier lets you comment on any website, highlight what matters, and join discussions right where the content lives — on desktop with the extension and on mobile with the app.

Create your account Try it out!
No fees or subscriptions. Works across browsers and Android. Privacy-first by design.
Quick look: browsing any site with Annotier conversations in context.

Annotier Extension — conversations that browse with you

The Annotier browser extension adds a lightweight, persistent sidebar to any page you visit. Comment, highlight, and follow threads without waiting for a site to enable comments.

  • Works on articles, videos, PDFs, product pages — if it has a URL, it can host a discussion.
  • One identity across the web for consistent, portable conversations.
  • Built for performance and privacy. We protect your data.
Add to Chrome Add to Firefox Read the Extension Guide
Diagram showing the Annotier sidebar overlaying a webpage with highlights and comments
The sidebar anchors context to the page, so threads are always where you need them.

Annotier App — conversations about any content

Share any link or content into Annotier, catch up on threads, and respond on the go. Your web-wide conversation inbox, synced with your extension activity.

  • Share articles, music, and videos from any app into Annotier.
  • Follow topics, content, and domains across platforms.
  • You never miss the discussions that matter.
Get it on Google Play Read the App Guide
Mobile flow: share a page into Annotier and jump straight into the thread.

Annotier Groups — your spaces for focused collaboration

Groups let you comment together in private or public — choose exactly who can read and who can write. Whether you're studying, researching, or planning, groups make it easy to discuss content in context.

  • Control visibility — keep discussions private or open them to the wider Annotier community.
  • Collaborate across articles, PDFs, or any web content.
  • What about a study group with your friends? Share highlights and thoughts on the same page.
Learn more about Groups
Illustration of Annotier Groups showing shared comments and permissions
Groups offer full control over who can join and contribute.

About Annotier

We built Annotier to bring online discussions back together — across articles, videos, and websites. The internet is full of conversation, but it’s scattered: every platform holds a different thread, detached from the content it’s about. Annotier reconnects those threads directly to their sources.

Our idea is simple: wherever knowledge lives, dialogue should live beside it. By creating a shared layer for comments and context, we make it possible to follow and join meaningful discussions through the content itself and not apart from it.