How to Record a Webinar on Mac Without Losing the Audio

Recording a webinar on Mac looks straightforward until you play back the file and realize the audio is gone, distorted, or captured only from the wrong source. Of all the things that go wrong in webinar recordings, audio failure is the most common — and on Mac specifically, there’s a platform-level quirk that catches people by surprise. This guide covers the two main approaches to recording on Mac, the audio problem you need to know about before you hit record, and how to decide which setup is right for your situation.

QuickTime: What It Can and Can’t Do

QuickTime Player is built into every Mac and costs nothing. For basic recording needs, it does the job. You have two options: New Movie Recording (records your webcam and microphone) and New Screen Recording (records your screen). Both can export at up to 4K resolution.

The limitation is that these are separate modes. QuickTime cannot simultaneously record your screen and your webcam in a single file. If you’re running a presentation and want your face visible alongside the slides, you’ll need to either use a tool that composites both sources, or record them separately and combine them in post.

For many small teams running internal sessions or simple walkthroughs, QuickTime is adequate — especially if the goal is a screen recording with voiceover narration. The setup is minimal: open QuickTime, select your recording mode, choose your input source, and start. No account, no subscription, no configuration. That simplicity is genuinely useful when you don’t need more.

Where QuickTime starts to show its limits is quality control, multi-participant capture, and the audio problem described below.

The Audio Problem on Mac

This is the part most guides bury or skip entirely: QuickTime Screen Recording does not capture system audio by default on Mac. When you record your screen while playing a video, running slides with embedded audio, or hosting a Zoom call, QuickTime captures only what your microphone picks up from the room — not the audio coming through your speakers or headphones.

This is a macOS-level restriction, not a QuickTime bug. Apple doesn’t expose system audio to third-party capture without additional drivers. The workarounds involve installing a virtual audio driver (such as BlackHole or Loopback) that routes system audio back into QuickTime as a recordable input. This works, but it adds setup complexity and an extra software dependency that needs to be configured correctly before every recording session.

The practical implication: if you’re recording a webinar where audio quality matters — guests speaking, software audio, or any mix of sources — relying on QuickTime without first solving the system audio problem is a recipe for a broken recording. Testing your audio routing before the session is not optional.

One partial workaround that requires no extra software: if you’re recording your own presentation with voiceover (no external audio sources), use QuickTime Movie Recording mode with a good external microphone. You get clean microphone audio without needing system capture at all. This works for solo how-to recordings and product walkthroughs where you control all the audio.

When a Dedicated Tool Makes Sense

If you’re hosting webinars with guests, recording multi-participant sessions, or need separate audio tracks for editing, a dedicated recording platform becomes worth the cost and setup.

Riverside is one of the more capable options in this space. Its core approach is local recording: each participant records on their own device rather than streaming compressed audio and video to a central server. The result is separate 4K video and 48kHz WAV audio tracks per person, which gives you significantly more to work with in post-production — you can adjust levels, cut a bad section from one track without affecting others, and produce cleaner output than you’d get from a single mixed recording.

Beyond recording, Riverside includes a producer mode (a separate team member can manage the session behind the scenes without appearing on camera), text-based video editing (delete transcript text to cut the corresponding video), and Magic Clips for generating short-form clips from a longer recording. These are features that matter when you’re trying to repurpose webinar content across channels — not just archive it.

The honest framing: Riverside is a paid platform and the additional features are only relevant if you’re actually going to use them. If your use case is recording a 45-minute solo presentation once a month for internal reference, QuickTime with a good mic will likely suffice. If you’re recording guest interviews, producing lead-generation webinars, or distributing recordings across multiple formats, the local recording quality and post-production tooling justify the investment.

Also worth noting: audience reach matters after the fact. Research cited by Riverside puts 81% of webinar viewers watching recordings within 30 days of the live event. That means the recording quality isn’t just a production detail — it’s the version most of your audience actually sees.

Pre-Recording Checklist

Regardless of which tool you use, run through this before you record:

• Test your microphone input. Open System Settings → Sound and confirm the correct input device is selected. Record a 10-second clip and play it back before the session.
• Confirm system audio routing if you need it. If using a virtual audio driver, test the routing end-to-end before your actual session, not during it.
• Check internet stability. If you’re using a cloud-based recording tool or hosting a multi-participant session, a dropped connection mid-session can corrupt or lose portions of the recording. Ethernet over Wi-Fi is worth the extra step.
• Set your recording resolution. If you’re recording for an audience, confirm your output resolution matches your intended distribution format — 1080p minimum for anything shared externally.
• Close background applications. Notifications, other apps pinging your microphone, or CPU-heavy tasks can introduce audio artifacts or drop frames.
• Do a 2-minute test recording. Play it back in full before your real session. This catches mic issues, system audio routing problems, and framing issues that aren’t obvious until you see the output.

After recording, the next step is usually editing — trimming dead time, cutting mistakes, or combining tracks. For Mac users working with free tools, see How to Edit a Video on Mac for Free for a breakdown of what’s available without a paid subscription.

Source: How to Record a Webinar on Mac (Riverside). This article is a practical interpretation of that content.