Free and online together mean zero friction: no price, no account, no software — just open the page.
Most "free" audio software still asks you to register an email or download an installer before you can use it. This tool removes both steps, so the time between deciding to try it and actually adjusting sound is a few seconds.
Being free and browser-based hasn't meant cutting features — bypass, limiter, mono downmix, rumble filter, balance, speed, and saveable settings codes are all included, not held back for a paid tier that doesn't exist.