A limiter plugin is a mixing and mastering tool that stops your audio from going above a set ceiling, no matter how loud the input gets. It’s a fast, aggressive form of compression with a very high ratio, and it’s the go-to processor for catching stray peaks and pushing a track to its final competitive loudness without letting it clip. If you’ve ever wondered what is a limiter plugin and why almost every finished master has one across the stereo bus, this guide walks through what it does, how it works, and how to use it well.
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What is a limiter plugin, and what does it actually do?
Think of a limiter as a wall your signal can’t climb over. You set a maximum output level — the ceiling — and the plugin guarantees nothing gets louder than that. When an incoming peak tries to exceed the threshold, the limiter clamps down instantly and reduces the gain by exactly enough to keep the output under the ceiling. Everything below the threshold passes through untouched.
That behaviour makes a limiter two things at once: a safety device and a loudness tool. As a safety device, it catches unpredictable transients — a snare hit, a plosive on a vocal, a bass note that jumps out — so they never overshoot into digital clipping. As a loudness tool, it lets you turn the whole track up into the ceiling, squashing the loudest peaks so the average level rises. That’s how modern masters sound loud and consistent without distorting.
How a limiter differs from a compressor
A limiter is really just a compressor taken to an extreme, so the confusion is understandable. Both reduce dynamic range by turning down signal above a threshold. The difference is in degree and intent.
A compressor uses a moderate ratio — say 2:1 or 4:1 — to gently even out a performance, adding punch, glue, or sustain. It’s shaping tone and feel. A limiter uses a ratio so high (10:1, 20:1, or effectively infinity:1) that virtually no signal gets past the threshold. Its job isn’t tone; it’s control. You reach for a compressor when you want a vocal or bus to sit more evenly. You reach for a limiter when you want a hard ceiling and maximum loudness. Many engineers use both in a chain — compression to shape, then a limiter last to catch what’s left and set the final level. If you’re still building the fundamentals, our guide to EQ and compression fundamentals is a good companion to this one.
The key controls on a limiter plugin
Most limiters keep the interface simple, because the whole point is one clear job. Here are the controls you’ll meet on almost any of them.
Threshold (or Input Gain). This sets where limiting begins. On many maximisers you push the input gain up to drive more signal into the ceiling — the more you push, the more limiting happens and the louder the result. Lowering the threshold does the same thing from the other direction.
Ceiling (Output Level). The absolute maximum the plugin will output. On a master, engineers often set this a touch below full scale — around -1.0 dBTP — to leave headroom for lossy encoding like MP3 or streaming codecs, which can push peaks slightly higher on playback.
Release. How quickly the limiter lets go after clamping a peak. Fast release recovers loudness quickly but can cause distortion or pumping on dense material; slow release is smoother but can dull transients. Many modern limiters offer an auto or adaptive release that adjusts to the program for you.
Attack / Lookahead. True peak and “brickwall” limiters use lookahead — they peek a few milliseconds into the future so they can start turning down just before a transient arrives, catching it cleanly instead of distorting.
True peak (ISP) detection. This measures inter-sample peaks — levels that occur between the digital samples and can exceed 0 dBFS when the signal is reconstructed on playback. A true-peak limiter keeps those under control too, which matters for meeting streaming loudness targets.
How to use a limiter on your mix and master
The most common place for a limiter is the very last slot on your master bus, after your mix is balanced and any bus EQ or compression is in place. Put it last so it catches everything that comes before it.
Start with your ceiling set to about -1.0 dBTP. Then bring up the input gain (or lower the threshold) slowly and watch the gain-reduction meter. A few dB of reduction on the loudest moments is plenty for a natural, dynamic master. Push harder — 6 dB or more of constant reduction — and you’ll get louder, but you’ll also start losing punch and inviting distortion. Trust your ears over the meter: A/B against the unlimited version at matched loudness to check you’re actually improving the track, not just making it loud.
Because a limiter changes loudness, always judge it in the context of a loudness target rather than just “louder is better.” Our explainer on LUFS and how loud your master should be covers the numbers streaming platforms actually use, so you can set a sensible ceiling and integrated loudness instead of chasing the loudness war. Limiters also show up on individual tracks — a fast limiter on a bass or a spiky vocal can tame the odd rogue peak before it hits your bus compression. If vocals are your focus, pair this with how to mix vocals.
Common limiter mistakes to avoid
The biggest one is over-limiting. When you slam a master with 8, 10, or 12 dB of gain reduction, the transients flatten, the low end loses definition, and the whole thing starts to sound fatiguing and distorted. Loud is not the same as good — a well-balanced mix that’s limited gently will almost always beat a weak mix crushed into loudness.
A second mistake is trying to fix a mix with the limiter. A limiter can’t add balance it wasn’t given. If your low end is muddy or your vocal is buried, sort that in the mix first; the limiter should be the finishing touch, not the rescue. Third, watch your ceiling: leaving it at 0.0 dBFS invites inter-sample clipping after encoding, so back it off to around -1 dBTP. Finally, don’t forget to gain-match when you compare. Louder always sounds better for the first few seconds, which fools you into pushing too hard. Level-match your before-and-after and the honest comparison becomes obvious.
Where to get a limiter plugin
Every major DAW — Logic, Ableton Live, FL Studio, Cubase, Studio One, Reaper — ships with a capable limiter, and for a lot of work the stock one is genuinely all you need. When you want more transparency, better true-peak handling, or the character of a dedicated mastering maximiser, the third-party market is deep. A store like Plugin Boutique is a convenient place to compare mastering limiters and maximisers, read what each one is good at, and catch sales on the well-known options.
If you’re mastering more seriously and want an all-in-one chain, integrated suites bundle a limiter with EQ, multiband dynamics, and metering — our iZotope Ozone review looks at one of the best-known examples and how its limiter fits the bigger picture.
The best free limiter plugins worth trying
You don’t have to spend anything to get a great limiter. A few free options are widely used on real releases:
- LoudMax — a lightweight, transparent brickwall limiter with just a threshold and output control. It’s a firm favourite for its clean sound and tiny CPU footprint.
- TDR Kotelnikov — Kotelnikov is technically a mastering compressor, but its precise dynamics control makes it a superb final-stage companion; pair it with a dedicated limiter for the ceiling.
- Voxengo Span — not a limiter itself but a free true-peak-capable analyser that lets you see exactly where your peaks land while you set your ceiling.
- Your DAW’s stock limiter — Ableton’s Limiter, Logic’s Limiter/Adaptive Limiter, and Reaper’s ReaLimit are all genuinely good and cost nothing beyond the DAW you already own.
Start with LoudMax or your stock limiter, learn how gain reduction sounds on your own tracks, and upgrade to a paid maximiser only when you can clearly hear what you’re missing.
Frequently asked questions
Is a limiter the same as a compressor?
No, though they’re closely related. A limiter is a compressor with a very high ratio and a hard ceiling — its job is to stop peaks and set maximum loudness, not to shape tone. A compressor uses gentler ratios to even out and add character to a performance. In practice you often use both: compression to shape, a limiter last to control the final level.
Where should I put a limiter in my chain?
On a master, the limiter goes in the very last slot, after all your EQ, compression, and other processing, so it catches everything that comes before it. On individual tracks you can use a fast limiter earlier to tame occasional rogue peaks, but the loudness-setting limiter almost always lives at the end of the master bus.
What ceiling should I set on a mastering limiter?
A safe default is around -1.0 dBTP (true peak). That leaves a little headroom so lossy encoding and streaming codecs don’t push your peaks into clipping on playback. Combine that ceiling with a sensible loudness target in LUFS rather than pushing purely for maximum volume, and your masters will translate cleanly across platforms.
Ready to go deeper? Browse more tutorials in our Mixing & Mastering hub, and see how limiting fits the finishing stage in what is mastering.
