zulip/help/public-access-option.md

# Public access option

{!web-public-channels-intro.md!}

Web-public channels are indicated with a **globe** (<i class="zulip-icon zulip-icon-globe"></i>) icon.

## Enabling web-public channels in your organization

Enabling web-public channels makes it possible to create web-public
channels 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 channels is
disabled by default for all organizations.

### Information that can be accessed via API when web-public channels are enabled

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

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

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

### Enable or disable web-public channels

!!! warn ""
    Self-hosted Zulip servers must enable support for web-public channels in their
    [server settings](https://zulip.readthedocs.io/en/stable/production/settings.html)
    by setting `WEB_PUBLIC_STREAMS_ENABLED = True` prior to proceeding.

{start_tabs}

{settings_tab|organization-permissions}

1. Under **Channel permissions**, toggle the checkbox labeled **Allow
   creating web-public channels (visible to anyone on the Internet)**.

{end_tabs}

### Manage who can create web-public channels

{start_tabs}

{settings_tab|organization-permissions}

1. Under **Channel permissions**, make sure the checkbox labeled **Allow
   creating web-public channels (visible to anyone on the Internet)** is
   checked.

1. Under **Who can create web-public channels?**, select the option you prefer.

{end_tabs}

!!! tip ""
    See [Managing abuse](#managing-abuse) to learn why only
    trusted roles like moderators and administrators can create web-public channels.

## Creating a web-public channel

To create a new web-public channel, follow the [instructions for
creating a channel](/help/create-a-channel#create-a-channel_1), selecting
the **Web-public** option for **Who can access the channel?**.

To make an existing channel web-public, follow the instructions to
[change the privacy of a
channel](/help/change-the-privacy-of-a-channel), selecting the
**Web-public** option for **Who can access the channel?**.

## What can logged out visitors do?

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

They **cannot**:

* View channels that are not configured as web-public channels (or see
  whether any such channels 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 **Channel 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][info-via-api].
* Logged out visitors cannot view [usage statistics](/help/analytics).

[info-via-api]: /help/public-access-option#information-that-can-be-accessed-via-api-when-web-public-channels-are-enabled

### Information about users

Logged out visitors can see the following information about users who
participate in web-public channels. They do not see this information
about users who do not participate in web-public channels 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](/help/status-and-availability),
  and whether they have set themselves as unavailable.
* Detailed profile information, such as [custom profile
  fields](/help/custom-profile-fields).
* Which users are subscribed to which web-public channels.

## 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 channels have a few limitations designed to make
Zulip an inconvenient target:

* Only users in trusted roles (moderators and administrators) can be given
  permission to create web-public channels. This is intended to make it hard
  for an attacker to host malicious content in an unadvertised web-public
  channel 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](/help/contact-support)
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](/help/moderating-open-organizations) to ensure compliance
with [Zulip's Rules of Use](https://zulip.com/policies/rules).

## Caveats

* Web-public channels do not yet support search engine indexing. You
  can use [zulip-archive](https://github.com/zulip/zulip-archive) to
  create an archive of a Zulip organization that can be indexed by
  search engines.
* The web-public view is not yet integrated with Zulip's live-update
  system. As a result, a visitor will not see new messages that are
  sent to a topic they are currently viewing without reloading the
  browser window.

## Related articles

* [Moderating open organizations](/help/moderating-open-organizations)
* [Channel permissions](/help/channel-permissions)
* [Restrict channel creation](/help/configure-who-can-create-channels)