Booster Volume

Mac Volume Booster

Start with the honest answer: macOS has no equivalent of Windows Loudness Equalization, and no supported way to push output past 100%. What it does have is a limiter that may be switched on without your knowledge, a normalization setting in Music, and finer control over the range you do have. Those three cover most cases of a quiet Mac.

Check these first

Each of these can cap volume in a way that looks like broken hardware.

  1. Reduce Loud Sounds

    System Settings › Sound › Reduce loud sounds. When enabled, this caps output at a decibel threshold you set. It is a hearing-protection feature and it does exactly what it says — if it is on and set low, your Mac will refuse to get louder no matter what you do.

  2. Output device selection

    System Settings › Sound › Output. Macs happily route audio to a display, a Bluetooth device that is out of range, or an AirPlay target you forgot about. If the volume slider is greyed out or moves without effect, the selected output is the problem.

  3. Balance slider

    On the same Output pane, check that Balance is centred. A slider dragged left or right silences one channel, which sounds like the overall volume has halved — because it has.

  4. Per-app volume

    macOS has no system volume mixer, but individual apps keep their own levels. Check the volume control inside the app itself, particularly in browsers, media players and video conferencing software.

Getting more from the range you have

Quarter-step volume
Hold Option+Shift while pressing the volume keys to adjust in quarter increments. Useful when one step is too quiet and the next is too loud.
Sound Check in Music
Music › Settings › Playback › Sound Check normalizes playback level across your library, so quiet tracks come up toward the others. It does not raise the ceiling but it removes the inconsistency.
Audio MIDI Setup
In Applications › Utilities, this shows per-channel output levels for your device. If one channel has been reduced, restoring it recovers real volume.
Clean the speaker grilles
On laptops that have travelled, dust in the grille measurably reduces output. A soft brush is safer than compressed air.

Boost a file in your browser

No extension, no system permissions, nothing to uninstall later.

Boost a file nowRuns in Safari, Chrome and Firefox on macOS.

Drop an audio or video file here, or choose one. It is processed on your device and never uploaded.

Processed on your device — nothing is uploaded. Loud audio can damage hearing: lower your system volume before boosting, then raise it gradually.

Frequently asked questions

Can I increase Mac volume above 100%?

Not through macOS itself. The output slider caps at 100% and there is no built-in amplification beyond it. Boosting a specific file in a browser tool works because the amplification happens before the system mixer.

Why is my MacBook so much quieter than it used to be?

Check Reduce loud sounds first, then the balance slider, then physical obstruction of the grilles. A gradual decline usually means dust; a sudden one usually means a setting changed, often after a macOS update.

Does macOS have anything like Loudness Equalization?

Not as a system-wide setting. Sound Check in the Music app normalizes across tracks, which addresses a related problem, but it only applies within Music.

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