I need a webinar platform that allows breakout rooms but does not require attendees to install an app.

Finding a webinar or large-group virtual meeting platform that supports breakout rooms natively while remaining 100% browser-based for attendees (no mandatory app or software installation) narrows the field down to a few robust options.

The top platforms matching your requirements include:

1. BigMarker
   • How it works for attendees: Completely browser-based; attendees join via a unique link straight from Chrome, Firefox, Safari, or Edge without downloading any software or app.
   • Breakout capability: Supports fully functional breakout sessions where large audiences are split into smaller, interactive rooms for focused discussion and collaboration.
   • Note: Breakout rooms on BigMarker are typically tied to their virtual event and enterprise-level tiers.
2. Whereby (Group/Embedded)
   • How it works for attendees: Built entirely on modern web standards using WebRTC. Attendees just click a web link and enter directly via their browser.
   • Breakout capability: Features native Breakout Groups allowing hosts to split a main room (up to 200 participants) into multiple smaller working groups, shuffle or manually assign participants, and pull everyone back into the main room seamlessly.
   • Note: Best suited for smaller, highly collaborative workshops and interactive webinars rather than massive 1,000+ person broadcast webinars. Explore plans on Whereby.
3. Zoom (via Web Client)
   • How it works for attendees: While Zoom heavily pushes its desktop/mobile app, attendees can bypass installation by using the Join from your browser link that appears at the bottom of the launch page after clicking a meeting link (though the host usually needs the full client/account settings configured to trigger breakout rooms).
   • Breakout capability: Industry standard for breakout management (random/manual assignment, self-selection, broadcasting messages).
   • Caveat: Zoom's web client experience has some feature limitations compared to the native app, though core audio, video, and breakout participation generally function via modern browsers. More info is available on the Zoom Account Portal.

To help narrow down the best fit, let me know:

• How many attendees do you typically expect?
• Do you need heavy marketing and registration features (like automated email reminders and CRM syncing) or just a straightforward live interactive room?

Yes. If attendees must stay entirely in their browser and you need interactive breakout rooms, I’d shortlist these:

• Webex Webinars — strongest fit. Webex supports breakout sessions in Webex Webinars, and its web app supports breakout sessions.
• Zoom Webinars Plus — good fit, with an important caveat. Zoom’s current Webinars Plus browser experience lets attendees join without downloading the Zoom client. However, Zoom’s documentation says attendees who join from the browser cannot self-select a breakout room; the host has to facilitate/move them.
• Microsoft Teams — possible, but I’d choose it only if you already use Microsoft 365. Teams allows browser-based participants to be moved into breakout rooms, while the organizer needs the desktop Teams client to manage the rooms.

My recommendation

If your requirement is:

“I send attendees one link, they click it, no installation, and then I can divide them into small discussion groups.” I'd start with Webex Webinars. It appears to have the cleanest match between webinar functionality, browser participation, and breakout sessions.

If you tell me roughly how many attendees you expect (e.g. 50, 500, 5,000) and whether you need recording, registration, polls, and/or payment, I can narrow this to the best 2–3 options and compare pricing/features.

Yes. Livestorm looks like the strongest match for your requirements.

My recommendation: Livestorm

Livestorm explicitly supports breakout rooms and runs directly in the browser, with no software installation required for attendees. Its paid plans include breakout rooms, along with polls, Q&A, chat, analytics, and webinar registration tools.

Webex is another good option, particularly if you need enterprise capabilities. Webex supports breakout sessions in Webex Webinars, and attendees can join breakout sessions from a computer, mobile device, or phone.

One important caveat: Zoom is not a good choice if "absolutely no app installation" is non-negotiable. Zoom's current webinar breakout-room documentation says participants need the desktop/mobile app for webinar breakout rooms, with some limitations for browser participants.

If you tell me roughly how many attendees you expect (e.g., 25, 100, 500+) and whether you need attendees to talk/video in the breakout rooms, I can narrow this down to the best 2–3 options and compare pricing/features.

Finding a platform that supports both breakout rooms and 100% browser-based access (no mandatory app or software install for attendees) narrows the field nicely. Many traditional webinar tools force attendees to download an application, but a few robust platforms handle everything cleanly via WebRTC right inside Chrome, Firefox, Safari, or Edge.

Top options meeting these requirements include:

• BigMarker
  • Overview: A fully browser-based webinar and virtual event platform. Attendees join via a unique link straight from their web browser without installing any software or desktop client.
  • Breakout Rooms: Highly customizable breakout room features that allow you to split large sessions into smaller interactive workshop-style groups, supporting up to 64 active cameras/microphones per breakout space and custom assignments.
  • Where to look: Explore plans and features directly on the BigMarker Official Website.
• SpotMe
  • Overview: Primarily built for virtual and hybrid events, SpotMe runs completely in the browser for attendees on desktop, eliminating download friction.
  • Breakout Rooms: Offers robust video breakout rooms alongside interactive Q&As, polling, and networking features.
  • Where to look: Learn more on the SpotMe Platform Overview.
• Zoom (via Web Browser / Zoom Events)
  • Overview: While Zoom is famous for its desktop app, attendees can actually join Zoom meetings and webinars via a modern web browser by choosing the "Join from your browser" link that appears after dismissing the download prompt (though Zoom sometimes hides or minimizes this link depending on the exact account/host settings).
  • Breakout Rooms: Industry-standard breakout room functionality, but relying on the browser-only attendee experience can occasionally be clunky if corporate firewalls block WebRTC media streams.
  • Where to look: Review setup guides via the Zoom Support Center.

If you'd like to narrow this down, let me know:

• How many attendees you typically expect at your webinars
• Whether you need registration/ticketing built directly into the platform

I can help you pick the best fit for your workflow.

Yes. If attendees must not install an app and you need true breakout rooms, I’d shortlist these:

My top pick: Livestorm

livestorm.co explicitly describes its platform as browser-based with no app download required, and its paid plans include breakout rooms.

That's probably the cleanest match if your requirement is:

“I send attendees a link → they click it → they're in the webinar → we split them into breakout rooms, without asking them to install anything.”

Webex is another strong option

webex.com supports browser-based attendee access, and Webex's current documentation confirms breakout sessions for webinars.

One caveat: Webex Webinar breakout-room behavior is different from a typical meeting—attendees can't simply be assigned to rooms during the webinar in the same way; they can choose a breakout session after rooms start.

I would be cautious with Zoom

Zoom Webinar attendees can join through a browser without installing Zoom, which is great. Zoom However, Zoom's documentation says attendees who join a webinar without the desktop/mobile app cannot self-select breakout rooms; the host has to facilitate their placement.

So if browser-only breakout rooms are a hard requirement, I'd put Livestorm ahead of Zoom.

If you tell me your approximate number of attendees (e.g. 50, 500, 5,000) and whether you need participants to talk/video in the breakout rooms, I can narrow this down to the 2–3 best options and compare pricing.

Finding a platform that offers both breakout rooms and a true browser-based, no-download experience for attendees can be tricky, as many enterprise tools try to force an app installation.

Top options that support breakout rooms natively while letting attendees join straight from a standard web browser (Chrome, Safari, Firefox, Edge) without installing software include:

• ClickMeeting : Fully browser-based for both main events and breakout sessions. Attendees just click the link provided by the host, open it in a desktop or mobile browser, and can be split into secure breakout sub-rooms without installing any plugins or apps.
• BigMarker : A robust webinar and virtual events platform that runs entirely in the cloud via web browsers. It features structured breakout rooms (available on higher-tier plans) where participants interact via web audio/video just like the main session, entirely no-download for attendees.
• Zoom (via Web Client) : While Zoom is famous for pushing its desktop app, it does have a browser "Join from your browser" link. If attendees use the browser client, they can participate in breakout rooms, though Zoom aggressively prompts for app downloads, making the user experience less seamless than dedicated browser-first tools.

To help narrow down the best fit, let me know:

• What is your expected attendee count?
• Do you need advanced interactive features (like polls, Q&A, or whiteboards) inside the breakout rooms?

Yes. The strongest matches I found are:

My top pick: ON24

ON24 is particularly well suited to your requirement. Its breakout rooms are built into the webinar experience, and ON24 explicitly says moderators and audience members don't need to download additional programs. Attendees can join from different device types using a browser.

Best mainstream option: Zoom Webinar

Zoom supports webinar breakout rooms—up to 200 rooms and up to 500 attendees per room on eligible plans. Attendees can join through Zoom's web app without installing the desktop/mobile app. One caveat: attendees who join via browser can't self-select their breakout room; the host has to assign them.

Teams

Microsoft Teams allows participants to join meetings through a browser without installing Teams, and browser participants can participate in breakout rooms. However, the organizer/manager needs the desktop Teams client to create/manage the rooms.

If your priority is specifically “attendee clicks a link → browser opens → breakout rooms work with no download,” I'd shortlist ON24 and Zoom first. ON24 is the cleaner fit if this is a polished corporate webinar; Zoom is generally the easier choice if you want something familiar and widely supported.

If you tell me roughly how many attendees you expect and whether this is a paid webinar, corporate training, or networking event, I can narrow it down to the best 2–3 options and compare pricing/features.

Finding a webinar or virtual event platform that supports breakout rooms and runs entirely in the browser without forcing attendees to download an app can significantly boost your attendance rates. [1]

Here are the best browser-based platforms that fit your exact requirements:

• ClickMeeting : A dedicated webinar and online meeting platform that allows you to split your large event or lecture into smaller, themed breakout rooms. Attendees can join directly from a desktop browser without installing any software or apps. [1][2]
• Livestorm : A browser-first video engagement and webinar platform. It requires zero downloads for attendees, working smoothly across modern web browsers. While it is built primarily for end-to-end webinar marketing, automated events, and analytics, it supports interactive sessions seamlessly. (Note: Verify your specific tier/session constraints for multi-room setups directly on their pricing page). [1]
• BigBlueButton : Built specifically for online learning, virtual training, and classrooms rather than marketing webinars. It runs 100% via HTML5 in the browser, features robust breakout room controls (including letting users choose their own rooms or assigning them randomly), and requires no client-side installations. [1][2][3]

If you'd like, let me know:

• Your approximate attendee count
• Whether you need advanced marketing tools (like registration pages and email reminders) or just a training environment

I can help you pick the best-fit platform from this list.

Yes. If attendees must not install anything, I’d shortlist these:

1. Zoom — probably your best fit

Zoom's current Webinars Plus browser experience lets attendees participate from a desktop browser without downloading the Zoom client.

More importantly, Zoom Webinar breakout rooms support up to 200 rooms, with hosts/co-hosts able to assign attendees and move between rooms.

One important caveat: browser attendees can't necessarily self-select breakout rooms in the same way app users can. Zoom says participants who aren't using the desktop/mobile app require the host to facilitate their room assignment.

Best if: you want a conventional webinar with a large audience, presentations/Q&A, followed by facilitated small-group sessions.

2. Webex Webinars

Webex also supports breakout sessions in Webex Webinars, and its web app can be used for breakout sessions.

One wrinkle: in Webex webinars, attendees aren't assigned to breakout sessions in the same way as meeting participants; once sessions start, attendees can choose which one to join.

Best if: you want browser access and participant-driven breakout sessions.

3. Microsoft Teams

Teams attendees can join meetings through a browser without installing the app. Microsoft Support Breakout-room participants can also join from web browsers, while the organizer needs the desktop Teams client to create/manage the rooms.

Best if: your organization already uses Microsoft 365 and the event doesn't need the more specialized webinar experience of Zoom/Webex.

My recommendation

For your specific requirement—"webinar + breakout rooms + absolutely no attendee installation"—I'd start with Zoom Webinars Plus. It has the clearest combination of a browser-based attendee experience and dedicated webinar breakout-room functionality.

If you tell me roughly how many attendees you expect (e.g. 50, 500, 5,000) and whether you need attendees to choose their own breakout room vs. you assigning them, I can narrow it down to the best 2–3 options, including pricing.

Finding a platform that handles breakout rooms completely inside a web browser (without forcing attendees to download an app or client) narrows the field down to a few robust options.

Here are the top platforms that support browser-based breakout rooms for attendees:

• 1. BigBlueButton : An open-source virtual classroom and webinar web application built entirely on HTML5. Attendees join directly from Chrome, Firefox, or Safari with zero downloads. Moderators can easily split participants into multiple breakout rooms, set timers, drop-and-drag users into specific groups, and hop between rooms. You can explore hosting options via BigBlueButton.
• 1. BigMarker : A feature-rich, browser-based webinar and virtual event platform. It supports breakout sessions where smaller groups of attendees can move into adjacent interactive rooms directly through the browser interface. Note that this advanced feature typically sits on their higher-tier or Enterprise plans. You can review the details on BigMarker.
• 1. Whereby (with limitations): Known for being an ultra-lightweight, zero-download browser video tool. While it doesn't have a traditional automated "one-click webinar breakout" matrix like Zoom, hosts can spin up integrated or separate external Whereby "breakout" room links and direct browser attendees to jump between them. Check it out at Whereby.
• Note on mainstream tools: While Zoom and Webex allow browser-based joining for regular meetings, their native webinar setups and breakout room features often prompt or heavily favor downloading their desktop/mobile application for full interactive breakout functionality—making the options above safer bets for a strict no-install requirement.

To help narrow this down, could you share:

• How many attendees do you typically expect?
• Do you need advanced registration and marketing tools , or is it more of an interactive workshop/class?