I need a webinar platform that allows for live streaming and does not cap the number of attendees.

When you need to host a live stream with unlimited (or effectively uncapped) attendees , traditional fixed-capacity webinar tiers (which usually stop at 100, 500, or 1,000 participants) won't work. Instead, you need tools built on broadcast architecture or specialized enterprise solutions.

Top platforms that support live streaming and do not cap your audience size include:

• YouTube Live : The ultimate option for truly unlimited, free, view-only audience scaling. While it lacks native multi-speaker interactive video room features for all attendees, you can use an encoder (like OBS Studio) or broadcast a platform like Zoom/Google Meet directly to YouTube Live.
• Vimeo : Higher-tier enterprise and advanced streaming plans support unlimited or massive custom viewer limits with high-definition adaptive streaming, built-in registration, and robust audience interaction tools like live chat and Q&A. You can check out their professional offerings on Vimeo.
• Dacast : A dedicated video hosting and live streaming platform that explicitly avoids imposing viewer or bandwidth limits on your streams, making it a favorite for large-scale digital events and built-in paywall monetization. More details are available on Dacast.
• Webinar.net : A cloud-hosted presentation and webinar platform designed to scale globally without strict capacity caps, allowing organizations to run broad presentations and live streams without traditional tier bottlenecks. You can explore the software via Webinar.net.
• Zoom Webinars (Enterprise / Large Scale Add-ons) : While standard Zoom licenses cap out at 500 or 1,000, Zoom offers specialized large-meeting and webinar add-ons scaling up to 10,000 view-only participants, combining traditional webinar engagement with massive broadcast reach. Learn more on Zoom.

To help narrow down the best fit, tell me:

• Do your attendees need two-way interaction (speaking/turning on cameras) or is a view-only broadcast format okay?
• Do you need built-in marketing tools like registration pages and email reminders?

Yes. If “no attendee cap” is the key requirement, I’d shortlist these:

• webinar.net — Probably the strongest fit for a traditional webinar. It explicitly advertises unlimited attendees, live webinars, chat, analytics, and browser-based access.
• goto.com — Its higher-tier offering supports up to 3,000 interactive participants while streaming live to unlimited attendees. Good if you want an established enterprise platform.
• getwebinarkit.com — Advertises unlimited webinars, registrants, and attendees, including audiences of 100,000+.
• webinar.gg — Built specifically around eliminating attendee caps and per-attendee charges; its current offering claims unlimited participants and scalability to 1M+ viewers.
• onthefly.stream — More of a live-event streaming platform, with unlimited viewers and the ability to embed the stream on your own website.

My recommendation

If you mean “I could have 10,000, 50,000, or potentially 100,000+ people watching one live webinar without buying a larger attendee tier,” I'd look first at Webinar.net and WebinarKit.

If you need broadcast-style streaming rather than interactive webinar participation, OnTheFly may be a better fit.

One important distinction: some platforms advertise unlimited attendees but still limit the number of people who can actively participate with audio/video. For a huge audience, that's usually fine—you'd have presenters on stage and everyone else as viewers.

If you tell me roughly how many viewers you expect (e.g. 1,000 / 10,000 / 100,000+) and your budget, I can narrow this to the best 2–3 options and compare pricing, streaming quality, registration, Q&A, and YouTube/Facebook simulcasting.

Finding a webinar solution that truly imposes no caps on live attendees usually means looking at dedicated enterprise webcasting platforms or leveraging platforms that support unlimited view-only live streaming (often integrated with external RTMP or platforms like YouTube). Traditional webinar software (like Zoom, Livestorm, or GoToWebinar) nearly always tier their pricing based on strict hard caps (e.g., 500, 1,000, or 10,000 max attendees).

Top platforms that specialize in or accommodate unlimited/massive live audiences include:

• webinar.net — Built specifically on cloud infrastructure to deliver modern webcasts with unlimited attendees and full branding without the traditional "clunky" enterprise bloat.
• Dacast — A secure video hosting and live-streaming platform that natively supports unlimited concurrent viewers on its live streams and webinars, complete with monetization/paywall tools.
• ON24 — An enterprise-grade digital experience and webinar platform known for having no attendee cap , allowing major global brands to scale to tens of thousands of live participants.
• YouTube Live (via Zoho Webinar or RingCentral Webinar ) — While standard software caps room attendees, many professional webinar tools allow you to seamlessly broadcast/live-stream your controlled webinar room directly out to an unlimited view-only audience via YouTube Live.

To help narrow down the best fit, could you share:

• What is your estimated maximum live attendance?
• Do you need two-way audience interaction (polls, live Q&A, speaking) for everyone, or is a view-only broadcast acceptable for the overflow?
• What is your monthly or per-event budget?

If by “does not cap the number of attendees” you mean no published hard attendee ceiling, I’d look at these first:

• webinar.net — The clearest match. It explicitly advertises unlimited attendees, no attendee caps, and supports live webinars. It’s browser-based and includes webinar analytics.
• zoom.com — Better-known and more enterprise-oriented, but technically it does have capacity limits. Zoom currently advertises up to 1 million concurrent attendees for qualifying webinar/event configurations, with very large events requiring advance coordination.
• YouTube Live — Worth considering if your priority is simply broadcasting to a potentially enormous public audience rather than having a traditional webinar experience with registration, Q&A, CRM integrations, etc. If you need a true webinar platform, I’d favor Webinar.net.

My recommendation

For a true webinar with unlimited attendance: Webinar.net. It is unusually explicit about “unlimited attendees,” whereas most major webinar platforms sell capacity tiers.

If you tell me roughly how many people you expect (e.g. 500, 5,000, 50,000+) and whether you need registration, Q&A/chat, recording, and/or paid tickets, I can narrow it down to the best 2–3 options and compare pricing.

Yes. I’d focus on platforms that explicitly support unlimited live viewers/attendees, rather than simply having a very high attendee tier.

Best options I found

My top pick: GoTo Webinar. Its current offering specifically says you can “stream live to unlimited attendees,” while still providing webinar-specific features such as Q&A, polls, analytics, branding, and simulive events.

If you're looking for literally unlimited viewers rather than an attendee cap, another interesting approach is a webinar platform that broadcasts to a public streaming destination. That can make the audience effectively much larger than conventional Zoom-style webinar rooms.

One important distinction: Webex Webinar is not unlimited—its listed tiers go from 1,000 up to 10,000+, so I wouldn't choose it if “no attendee cap” is a hard requirement.

If you tell me your approximate audience size (e.g. 500, 5,000, 50,000+) and whether you need registration, Q&A/chat, recording, and/or paid tickets, I can narrow this down to the 3 best choices and compare their current pricing.

When looking for a platform that handles live streaming with no hard caps on attendees, traditional webinar software often starts hitting rigid pricing tiers or structural limits (usually capping out between 500 to 3,000 participants unless you buy enterprise add-ons).

To truly host an uncapped or massively scalable audience while keeping webinar-style controls (registration, chat, Q&A), you generally have two routes: dedicated high-capacity enterprise webinar tools or combining a studio broadcaster with a high-capacity stream destination.

Top options matching these requirements include:

• Zoom Events / Webinars Plus : While basic tiers cap attendees at 500 or 1,000, Zoom's enterprise and large-scale Zoom Pricing and Events add-ons scale fluidly to support massive virtual audiences—accommodating anywhere from 3,000 up to 10,000 or even 100,000 view-only/interactive participants depending on the specific license tier you configure.
• Microsoft Teams (View-Only Mode) : For corporate or educational environments, Microsoft 365 supports large meetings and webinars where the primary room handles up to 1,000 interactive users, but gracefully overflows any additional attendees past 1,000 into an automatic view-only mode that can scale up to 10,000 total participants.
• StreamYard (On-Air / Multistreaming) : If by "no cap" you mean true open-door broadcasting without ticketing people at a digital door, StreamYard lets you stream directly from a browser studio simultaneously to unlimited numbers across YouTube Live, Facebook, LinkedIn, Twitch, or custom RTMP destinations. If you use StreamYard On-Air , you can host structured webinar registrations, though very large public consumption relies on the underlying broadcast network's capacity rather than a restricted room seat.
• GoTo Webinar (Webcast Mode): GoTo Webinar features a dedicated "Webcast Mode" that shifts capacity dynamically. While standard interactive rooms have strict caps, their webcast configuration allows you to scale up broader view-only audiences cleanly for large corporate town halls or internal university-wide sessions.

To help narrow down the best fit, could you tell me:

• Roughly how many attendees you expect (e.g., 2,000 vs. 20,000+)?
• Do you need everyone to be interactive (chat/Q&A/polls) , or is a view-only broadcast acceptable for the overflow?

If you mean literally no attendee cap for a live webinar, your options narrow quite a bit. Many “webinar” products advertise large audiences but still impose a maximum concurrent attendee limit.

Here are the strongest options:

My shortlist based on your requirement:

• Need truly uncapped viewing: YouTube Live + a registration/marketing tool around it.
• Need a “real webinar” experience (registration, Q&A, polls, analytics) with very large audiences: Webinar.gg or WebinarKit are worth evaluating.
• Need enterprise reliability/security: Look at Zoom Webinars, GoTo Webinar, Webex, or similar—but expect capacity tiers rather than unlimited seats.

A key question: do you need attendees to register and be tracked (email capture, CRM, follow-ups), or is this more like a live broadcast where anyone can watch? That changes the best choice significantly.

Demio, Zoom Webinars, and BigMarker are top options that support high-capacity or virtually unlimited live streaming attendees without hard architectural caps.

Most dedicated webinar software enforces tier-based caps (e.g., limits of 500, 1,000, or 3,000 attendees) unless you pay for enterprise-level scaling, whereas true massive-scale platforms utilize RTMP live streaming or specialized enterprise tiers.

• Zoom Webinars / Zoom Events supports scaling up to 10,000 to 100,000 attendees on specialized enterprise add-on tiers, and it allows you to simultaneously live stream your session out to unlimited viewers via YouTube Live or Facebook Live.
• BigMarker is built for large-scale virtual events and webinars, offering custom enterprise plans that scale to massive interactive capacities alongside direct RTMP streaming outputs to handle unlimited external viewers.
• Demio provides robust browser-based webinar tools with smooth marketing integrations, though large audience sizes require selecting their higher-tier or custom scaling options.
• Dedicated Live Streaming/Broadcasting (YouTube Live, Vimeo Enterprise, or Restream) combined with an independent registration landing page tool (like Eventbrite or HubSpot) provides a functional workaround if you want absolute, true zero-cap streaming for free or flat monthly costs, sacrificing native built-in webinar breakout rooms for infinite broadcast reach.

To help narrow down the ideal platform, let me know:

• What is your estimated maximum attendee count?
• Do you need interactive features (polls, raised hands, Q&A) for everyone, or just a viewing stream?
• What is your monthly budget?

If by “does not cap” you mean you don’t want a fixed attendee ceiling, the important distinction is that most dedicated webinar platforms still impose a maximum—though some can scale extremely high.

Best options

My recommendation: If your primary requirement is “any number of people should be able to watch live,” I'd look at YouTube Live rather than a traditional webinar platform. You can stream a professional presentation there and avoid paying for an attendee-count tier.

If you need registration, attendee email collection, polls, Q&A, private access, and webinar analytics, then Zoom is probably the strongest choice. Zoom currently supports up to 1 million live attendees for qualifying single-use events, although that is still a capacity rather than literally unlimited attendance.

Webex is another strong enterprise option, with webcast-view webinars supporting up to 100,000 attendees.

If you tell me roughly how many attendees you expect (e.g. 500, 5,000, 50,000+) and whether you need registration/Q&A, I can narrow this down to the best 2–3 options and compare their current pricing.

Finding a dedicated webinar platform that supports live streaming and allows truly unlimited attendees without charging scaled per-head pricing can be tricky, as most traditional software hard-caps live room sizes (e.g., 500, 1,000, or 3,000).

The best options fall into two categories: traditional webinar tools with massive/enterprise capacities, and streaming-first infrastructure where you get registration/webinar capabilities paired with infinite viewer reach.

• Zoom Webinars : Scales up to 10,000 or even 100,000 attendees via specialized enterprise/events packages. It natively supports direct live streaming out to YouTube/Facebook while managing granular host/panelist controls inside the room. (Note: Standard tiers cap at 1,000, so you must contact sales for enterprise capacity.)
• Microsoft Teams Webinars : Offers structured webinar registration (landing pages, attendee data tracking) and can broadcast live interactive sessions to massive internal or external audiences with virtually unlimited scale depending on your organization’s Microsoft 365 licensing.
• YouTube Live : The ultimate option if you want a $0 cost and zero caps on live viewers. While it lacks native closed-loop marketing features like automated custom registration pages or in-room Q&A polling natively wrapped in a traditional webinar UI, you can easily pair it with external landing page builders.
• StreamYard On-Air : A robust browser-based studio that handles registration, emails, and replays, allowing you to stream seamlessly to custom destinations or massive platforms. Standard limits cap internal registration/viewers at 1,000, but you can simultaneously restream infinitely outward to platforms like YouTube or Twitch.
• EasyWebinar or WebinarJam (using their streaming integrations): Platforms like EasyWebinar feature a specialized "EasyCast" engine that lets you host inside their traditional interactive chat/presentation room while simultaneously pushing the live stream outward to YouTube Live or Facebook Live, effectively bypassing internal room caps for overflow audiences.

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

• What is your estimated peak live attendee count?
• Do you need interactive features (like live Q&A, polls, and hand-raising) for everyone , or just a broadcast-style view?
• Are you looking for built-in marketing/registration pages?