Web public streams

This feature is under development, and is not yet available on Zulip Cloud.

Administrators may enable the option to create web public streams. Web public streams can be viewed by anyone on the Internet without creating an account in your organization.

For example, you can link to a Zulip topic in a web public stream from a GitHub issue, a social media post, or a forum thread, and anyone will be able to click the link and view the discussion in the Zulip web application without needing to create an account.

Users who wish to post content will need to create an account in order to do so.

Web public streams are indicated with a globe () icon.

Enabling web public streams in your organization

Enabling web public streams makes it possible to create web public streams in your organization. It also makes certain information about your organization accessible to anyone on the Internet via the Zulip API (details below).

To help protect closed organizations, creating web public streams is disabled by default for all organizations.

Information that can be accessed via API when web public streams are enabled

The following information about your organization can be accessed via the Zulip API if web public streams are enabled and there is currently at least one web public stream.

  • The organization's settings (linkifiers, custom emoji, permissions settings, etc.)
  • Names of users
  • Names of user groups and their membership
  • Names and descriptions of streams

Enabling web public streams is thus primarily recommended for open communities such as open-source projects and research communities.

Enable or disable web public streams

Self-hosted Zulip servers must enable support for web public streams by setting WEB_PUBLIC_STREAMS_ENABLED = True in their server settings prior to proceeding.

  1. Go to Organization permissions.

  2. Under Stream permissions, toggle the checkbox labeled "Allow creating web public streams (visible to anyone on the Internet)".

Manage who can create web public streams

  1. Go to Organization permissions.

  2. Under Stream permissions, make sure the checkbox labeled "Allow creating web public streams (visible to anyone on the Internet)" is checked.

  3. Under Who can create web public streams?, select the option you prefer.

See Managing abuse to learn why only trusted roles like Moderators and Administrators can create web public streams.

Creating a web public stream

To create a new web public stream, follow the instructions for creating stream, selecting the Web public option for Who can access the stream?.

To make an existing stream web public, follow the instructions to change the privacy of a stream, selecting the Web public option for Who can access the stream?.

What can logged out visitors do?

Logged out visitors can browse all content in web public streams, including using Zulip's built-in search to find conversations. Logged out visitors can only access the web public streams in your organization, and the topics, messages (including uploaded files) and emoji reactions in those streams.

They cannot:

  • View streams that are not configured as web public streams (or see whether any such streams exist) without creating an account.
  • Send messages.
  • React with emoji.
  • Participate in polls, or do anything else that might be visible to other users.

Logged out visitors have access to a subset of the metadata information available to any new account in the Zulip organization, detailed below.

Information about the organization

  • The Organization settings and Stream settings menus are not available to logged out visitors. However, organization settings data is required for Zulip to load, and may thus be accessed via the Zulip API.
  • Logged out visitors cannot view organization statistics.

Information about users

Logged out visitors can see the following information about users who participate in web public streams. They do not see this information about users who do not participate in web public streams in the Zulip UI, though they may access it via the Zulip API.

  • Name
  • Avatar
  • Role (e.g. Administrator)
  • Join date

The following additional information is not available in the UI for logged out visitors, but may be accessed without an account via the Zulip API:

  • Configured time zone
  • Which user groups a user belongs to

The following information is available to all users with an account, but not to logged out visitors:

  • Presence information, i.e. whether the user is currently online, their status, and whether they have set themselves as unavailable.
  • Detailed profile information, such as custom profile fields.
  • Which users are subscribed to which web public streams.

Managing abuse

The unfortunate reality is that any service that allows hosting files visible to the Internet is a potential target for bad actors looking for places to distribute illegal or malicious content.

In order to protect Zulip organizations from bad actors, web public streams have a few limitations designed to make Zulip an inconvenient target:

  • Only users in trusted roles like Moderators can be given permission to create web public streams. This is intended to make it hard for an attacker to host malicious content in an unadvertised web public stream in a legitimate organization.
  • There are rate limits for unauthenticated access to uploaded files, including viewing avatars and custom emoji.

Our aim is to tune anti-abuse protections so that they don't interfere with legitimate use. Please contact us if your organization encounters any problems with legitimate activity caused these anti-abuse features.

As a reminder, Zulip Cloud organizations are expected to moderate content to ensure compliance with Zulip's Rules of Use.

Caveats

The web public visitors feature is not yet integrated with Zulip's live-update system. As a result, a visitor will not see messages that are sent while Zulip is open until they reload the browser window.