You Need to Capture That Sound, But Your Mac Says No
You just heard the perfect sound effect in a video, a crucial piece of audio in a meeting, or a snippet from a song playing through your browser. You hit record, but all you get is silence. Your Mac’s built-in microphone is picking up the room, not the crisp system audio coming from your speakers.
This is a universal frustration for podcasters, video editors, gamers, and anyone who needs to archive digital audio. Unlike some other operating systems, macOS does not offer a simple “record computer audio” checkbox in its default utilities. The system is designed to protect application privacy, which means capturing internal audio streams requires either a workaround or the right tool.
This guide will walk you through every legal and effective method to record system audio on your Mac, from free built-in solutions to professional-grade software. By the end, you’ll be able to capture any sound your Mac produces, cleanly and reliably.
Why Can’t You Just Hit Record?
Modern versions of macOS, particularly from Catalina (10.15) onward, have strict audio permissions. Applications must explicitly request permission to capture your microphone (an input device) and, separately, to capture audio from other applications (system output). This is a core privacy feature.
Think of it like this: your microphone is a one-way street where sound enters the computer. Your system audio is a complex internal highway where sounds from Safari, Music, Zoom, and other apps are all mixed together. Apple gates this internal highway to prevent any app from secretly recording everything you hear without your knowledge.
Therefore, to record system audio, you need an application that is both trusted by macOS to access this output stream and configured correctly by you. The method you choose depends on your macOS version, your budget, and the quality you need.
The Prerequisites: Check Your macOS Version and Permissions
Before starting, know your macOS version. Go to the Apple menu > About This Mac. The solutions differ slightly for macOS Sonoma/Ventura versus older versions like Monterey or Big Sur.
You will also need to grant “Screen Recording” or “Microphone” permissions to any app you use. You’ll be prompted the first time the app tries to record. Go to System Settings > Privacy & Security to manage these permissions later if you accidentally denied them.
Method 1: The Free Built-In Solution with QuickTime and Soundflower (Legacy)
For years, the classic free method combined QuickTime Player with a virtual audio device like Soundflower or its modern successor. This method still works but involves more setup.
First, you need a virtual audio cable application. Soundflower is outdated. Instead, use BlackHole, a free, open-source, and actively maintained alternative. Download it from its official GitHub page and install it. During installation, you’ll need to allow kernel extensions in your Security & Privacy settings.
Once installed, BlackHole creates new audio devices in your system. Open System Settings > Sound. Set your “Output” device to “BlackHole 16ch” or “BlackHole 2ch”. This reroutes all system audio into the BlackHole virtual device.
Now open QuickTime Player. Go to File > New Audio Recording. Click the small dropdown arrow next to the record button and change the “Microphone” source from “Internal Microphone” to “BlackHole 16ch”. Hit record. All system audio will now be captured by QuickTime.
The major drawback: while recording, you won’t hear any sound yourself because your output is sent to BlackHole, not your speakers. To fix this, you need a multi-output device. Open Audio MIDI Setup (found in Utilities), click the + button, and create a “Multi-Output Device.” Check both “BlackHole” and your built-in speakers or headphones. Set THIS multi-output device as your system output. Now sound goes to both BlackHole (for recording) and your speakers (for listening).
When to Use This Method
This is a great zero-cost solution for occasional, non-critical recordings. It’s perfect for capturing a quick clip. However, the multi-device setup can be fragile, and you cannot easily separate audio from different applications. For frequent or professional use, the following methods are better.
Method 2: Use macOS’s Own Screen Recording
Did you know the built-in screen recorder can capture system audio? Starting with macOS Mojave, you can record your screen with a keyboard shortcut: Shift-Command-5.
This brings up the screen recording controls. Before recording, click “Options”. In the menu that appears, ensure “Microphone” is set to “None” if you don’t want your voice, and crucially, ensure “Sound” is set to “Computer Audio” or a similar option (the wording varies by macOS version).
Select the area of the screen you want to capture and click “Record”. It will capture both the video of your screen and the internal audio. The resulting file is a video (.mov). You can extract the audio track later using QuickTime (File > Export As > Audio Only) or another editor.
This method is incredibly simple and requires no extra software. The limitation is that it’s tied to screen video. If you only want audio, you have an extra step to extract it. The audio quality is also limited to the system’s mixed output.
Method 3: Dedicated Audio Recording Applications (Recommended)
For reliable, high-quality, and flexible system audio recording, a dedicated application is the best investment. These apps handle the virtual audio routing for you and offer features like separate application audio capture, level controls, and direct export.
OBS Studio: The Free Powerhouse
OBS Studio is free, open-source, and used by streamers worldwide. It’s exceptionally powerful for capturing audio and video.
After installing OBS, you need to configure an “Audio Output Capture” source. In the “Sources” box at the bottom, click the + and select “Audio Output Capture.” In the dialog, create a new source and select “BlackHole” (from Method 1) or, even better, select the specific application window you want to capture audio from if your macOS version supports it.
You must also add your microphone as an “Audio Input Capture” source if you want commentary. The genius of OBS is the “Audio Mixer” panel, where you can adjust the volume of your system audio and microphone independently in real-time. You can record directly to an MP4 or MKV file, or stream it.
OBS has a learning curve, but for a free tool, it offers professional-grade control. It’s ideal for recording gameplay, webinars, or any situation where you might want to mix multiple audio sources.
Audio Hijack: The Mac Audio Specialist
If audio is your primary focus, Rogue Amoeba’s Audio Hijack is the gold standard for macOS. It is paid software, but it turns your Mac into a sophisticated audio routing and recording studio.
Audio Hijack works on a “block” diagram. You drag an application (like Safari or Music) or your entire system audio into a session. Then you add blocks for effects, recording, and output. You can route the audio to your headphones while simultaneously recording it to a file in multiple formats (MP3, AAC, FLAC, etc.).
Its key advantage is per-application recording. You can record audio from Zoom, Chrome, and Spotify all into separate, synchronized files within the same session. It bypasses the need for complex virtual devices on modern macOS by using core audio technology. For podcasters, musicians, or anyone doing serious audio work on a Mac, Audio Hijack is worth every penny.
Other Notable Applications
– Loopback (also from Rogue Amoeba): More focused on creating complex virtual audio devices than recording, but it can be used in tandem with simple recorders like QuickTime.
– Sound Siphon: A simpler, less expensive alternative to Audio Hijack that provides easy system audio capture.
– Capto: A screen recording app with excellent built-in system audio capture and simple editing tools, great for educators.
Troubleshooting Common Audio Recording Issues
Even with the right tools, you might hit snags. Here are solutions to the most common problems.
No Sound in the Recording
This is almost always a permissions or routing issue. First, check System Settings > Privacy & Security > Screen Recording (or Microphone). Ensure your recording app is checked. If using a virtual device like BlackHole, ensure your system output is correctly set to the multi-output device or BlackHole itself during the recording process. In OBS or Audio Hijack, double-check that the correct audio source is selected and its volume fader is up.
Audio Sounds Muffled, Distorted, or Has Echo
Muffled sound often means you’re accidentally recording via your Mac’s internal microphone instead of the system audio. Double-check your input source in the recording app.
Distortion or clipping means the input volume is too high. Look for a gain or level control in your recording software and reduce it. Aim for the audio meter to peak in the yellow, not the red.
Echo occurs if you have both system audio and microphone enabled, and your microphone picks up the sound from your speakers. Use headphones while recording to eliminate this, or use software like OBS to apply a noise gate to your microphone input.
Recording is Out of Sync with Video
This is common when recording gameplay or screen captures. The cause is usually variable frame rate video. To fix it, you can use a video editor like iMovie, DaVinci Resolve, or even HandBrake to transcode the video to a constant frame rate before editing. For prevention, in OBS, set your output mode to “Advanced” and use a constant rate control (CRF) for recording.
Choosing Your Best Path Forward
Your ideal workflow depends on your needs. For the absolute simplest, one-off recording of a computer sound, use the built-in screen recorder (Shift-Command-5). It’s instant and requires no thought.
If you record system audio regularly but don’t need advanced features, invest an hour in setting up OBS Studio with BlackHole. It’s free and will handle 95% of use cases, from recording Zoom calls to capturing music samples.
For professional work where audio quality, reliability, and separate application tracks are non-negotiable, Audio Hijack is the definitive solution. It removes all the technical friction and lets you focus on your content.
The barrier to recording pristine system audio on your Mac is no longer a technical limitation—it’s simply knowing which lever to pull. Start with the method that matches your frequency and quality demands. Configure it once, and you’ll have a powerful audio capture setup ready for any task that comes your way.
