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

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.

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.
• 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).
• 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.

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?

Here are top web results for exploring this topic:

remo.co·https://remo.co/blog/the-best-webinar-platforms-with-breakout-rooms-everything-you-need-to-know-about-choosing-a-webinar-platform 8 Best Webinar Platforms with Breakout Rooms 2026 - Remo.co At a Glance: A webinar platform with breakout rooms lets hosts divide attendees into smaller virtual groups for discussions, workshops, networking, brainstorming, and collaborative activities before b LiveWebinar.com·https://www.livewebinar.com Top 10 Free Webinar Software in 2026 – A Comprehensive Guide LiveWebinar is a versatile webinar platform designed to facilitate various online events such as webinars, live streams, meetings, and virtual conferences. It offers a comprehensive set of features th Reddit·https://www.reddit.com The best webinar platform (from someone who's tried way too many)The best webinar platform (from someone who's tried way too many). If you've ever hosted a webinar (or even attended one), you know that picking the right platform is huge. The right one makes things WebinarNinja·https://webinarninja.com 10 Best Interactive Webinar Platforms to Boost Audience Engagement 1. WebinarNinja. Best Webinar Software to Generate Leads, Grow Sales, and Teach Better. Tap to unmute. Your browser can't play this video. Quora·https://www.quora.com Which introductory webinar software works without any installation ...One of the easiest webinar software platforms to use for attendees is WebinarNinja, as it doesn't require any installation. All attendees need to do is click a link to join the webinar, and they'll be popup.fm·https://popup.fm The 5 Best Free Webinar Platforms in 2026 (And Why Most ... - Popup Is there a completely free webinar platform? Yes. While platforms like Zoom and Webex limit free users to 40 minutes and 100 attendees, Popup is a completely free webinar platform with unlimited time, Livestorm·https://livestorm.co Best Webinar Platforms (Paid and Free) - Compare 19+ Tools Find out why Livestorm is the best overall webinar platform, no download required. Get our complete list of 19 top free and paid webinar platforms. GoTo·https://www.goto.com**Webinar** Software & Virtual Conference Platform - GoTo GoTo Webinar is the #1 customer-recommended webinar platform to engage with your audience through virtual conferences and events. Learn more today. Facebook·https://www.facebook.com**May** I know the best platform to hold a virtual seminar with less than ...Teams works best for me, easy to share staff but if you want a more convenient one without complicated subscription packages then zoom can do it|Zoom,... Zoom·https://www.zoom.com The 10 best webinar platforms for businesses [2025] - Zoom Screenshot of the Livestorm landing page. Livestorm is a solid option for businesses that need an entirely browser-based webinar platform. With no downloads required for attendees, it's easy for users

Yes. The key distinction is “attendees can join in a browser” versus “attendees can use breakout rooms in a browser.” Several platforms advertise browser-based attendance, but some require the app specifically for breakout-room participation.

Best options

Webex is probably the one I'd start with. Cisco's current Webex documentation explicitly supports breakout sessions in Webex Webinars, while its webinar pricing/features page says attendees can join via browser.

Teams is another strong candidate. Participants can join breakout rooms through web browsers such as Chrome and Edge, although the organizer needs the desktop Teams environment to create/manage the rooms.

I'd rule out Zoom if “no attendee app installation” is a hard requirement. Zoom's current documentation says webinar breakout-room participants need the desktop or mobile app; browser participants can't self-select breakout rooms, and the host has to facilitate their assignment.

GoTo Webinar does support browser-based attendance—its Webcast mode specifically says attendees can join from a browser with no download—but I'd want to clarify whether you need true breakout rooms within the live webinar rather than separate breakout sessions.

If you tell me roughly how many attendees you expect (e.g. 50, 500, 5,000) and whether you need video/audio interaction in the breakout rooms, I can narrow this to the 2–3 best platforms and compare pricing/features.

Yes. If attendees must be able to join breakout rooms entirely in a browser with no app/download, I’d shortlist these:

My top picks

1. Webex Webinars — probably the best match

Webex explicitly supports breakout sessions in Webex Webinars, and attendees can join through a browser. Its current webinar feature comparison also lists both breakout rooms and browser-based attendee joining.

One caveat: Webex's webinar breakout-room behavior is somewhat different from Zoom's. In a Webex webinar, attendees can choose a breakout session, whereas hosts don't assign individual attendees to rooms in the same way they can in meetings.

2. ON24 — excellent for structured workshops

ON24's Breakout Rooms work inside its webinar environment, with no additional program required for attendees or moderators. It supports up to 10 breakout rooms with up to 50 attendees per room. Breakout Rooms are an add-on.

This is particularly attractive if your webinar is more like a training/workshop with small-group discussions rather than simply a presentation.

3. GoTo Webinar — worth considering

GoTo Webinar has breakout rooms on its paid plans, and its Webcast mode lets attendees join directly through a browser with no download.

I'd verify the exact interaction you need, though, because GoTo's browser/no-download experience is specifically emphasized for webcast mode, while its conventional webinar attendee requirements can differ.

One I'd rule out: Zoom Webinar

Although Zoom Webinar now supports extensive breakout rooms, participants joining webinar breakout rooms are required to use the Zoom desktop or mobile app. Zoom specifically says people who join without the app can't self-select breakout rooms, and its requirements list the desktop/mobile apps.

If your requirement is simply “click a link → browser opens → attendee can participate in a breakout room without installing anything,” I'd start with Webex. ON24 is the stronger option if you're running larger, more polished enterprise events.

If you tell me roughly how many attendees you expect and whether attendees need video/audio inside the breakout rooms, I can narrow this to the best 2–3 options and compare pricing.

Finding a platform that supports breakout rooms and runs entirely in the web browser for attendees (no downloads or mandatory apps) narrows down the choices significantly, as many traditional tools force participants to install software to jump between rooms.

Top webinar and virtual event platforms that support breakout rooms natively while allowing attendees to join straight from a standard browser include:

• ClickMeeting : A fully browser-based platform designed heavily for online classes, training, and interactive webinars. It allows hosts to split events into up to 20 breakout rooms. Attendees do not need to install anything; they just click the link to enter the main room and are automatically or manually transitioned into their browser-based breakout rooms.
• BigMarker : A robust, feature-rich virtual event and webinar platform that operates entirely in the cloud via modern web browsers. It includes native breakout room functionality for interactive sessions and workshops, allowing attendees to jump into small-group discussions without installing desktop software. (Note: Breakout rooms on BigMarker are typically reserved for higher-tier or virtual event plans).
• Zoom (via Browser Join) : While Zoom is notorious for pushing its desktop app, attendees can bypass the download by choosing the "Join from your browser" link at the very bottom of the launch page. However, browser-based Zoom limitations can occasionally make transitioning smoothly into self-select breakout rooms clunky or restricted depending on the specific host/webinar license configuration.

If you'd like, let me know:

• Your approximate attendee count
• Whether you need automated registration and emails built-in
• Your budget or preferred pricing structure

I can help you pick the exact plan or platform that fits your workflow.

Finding a webinar platform that supports interactive breakout rooms entirely via a web browser (no downloads or apps required for attendees) is essential for keeping drop-off rates low.

Here are the top webinar and virtual event platforms that support breakout rooms and run natively in modern web browsers for attendees:

• BigMarker : A robust webinar and virtual event platform that features fully functional breakout rooms. Attendees can join directly through their browser via a unique link without needing to download any software or client application.
• Demio : Built specifically for marketing webinars, Demio offers seamless browser-based attendance with no downloads required. It includes interactive breakout rooms for splitting attendees into smaller collaborative groups.
• Zoho Meeting : An affordable, browser-based webinar and meeting solution. It supports breakout rooms for interactive sessions, and participants can join smoothly from desktop or mobile web browsers without installing an app.
• LiveStorm : A browser-first video communication platform that works on WebRTC technology. Livestorm supports breakout sessions and requires zero downloads or plugins for attendees joining from standard browsers like Chrome, Firefox, or Safari.

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

• Your approximate attendee capacity
• If you need advanced registration and email automation features
• Your budget range

I can help you pick the best exact match for your specific workflow.

Yes. If “attendees must not install anything” is a hard requirement, I’d shortlist these:

🥇 Webex Webinars

This is probably your strongest choice. Webex explicitly supports joining webinars from a browser without installing the app, and its webinar breakout sessions allow attendees to choose a breakout room once sessions begin.

One important limitation: in a Webex Webinar, the host can't move ordinary attendees between breakout rooms after the rooms have started; attendees choose their room. Panelists have more management capabilities.

🥈 Webex Meetings

If you don't actually need the formal webinar format—e.g., you want everyone to participate with microphones/cameras—Webex Meetings may be even better. Attendees can participate in breakout rooms, and Webex's web app requires no download or installation.

⚠️ Zoom Webinar

I'd not choose Zoom if the no-install requirement applies specifically to breakout participation. Zoom says webinar breakout rooms require the desktop or mobile app, and people who join without the app can't self-select a breakout room.

Bottom line: For a true webinar with potentially large attendance, I'd start with Webex Webinars. If you tell me roughly how many attendees you expect, whether attendees need to talk in the breakout rooms, and your budget, I can narrow it to 2–3 platforms and compare pricing/features.