Compressor vs Limiter: What's the Difference

The whole compressor vs limiter question comes down to one idea — a limiter is really just a compressor pushed to an extreme — and you can hear it for yourself in our free browser compressor: a compressor eases loud parts down at a gentle ratio so you still notice the dynamics moving, while a limiter clamps hard with a very high ratio and a fixed ceiling that no peak is ever allowed to cross. Same underlying tool, same threshold-and-ratio machinery. What separates them is how aggressively that machinery is set, and what job you're asking it to do. Get that straight and a lot of mastering advice that once sounded like two unrelated effects suddenly reads as a single dial turned to different points.

Here's the distinction at a glance before we dig in.

	Compressor	Limiter
What it does	Turns down anything above the threshold to even out level, keeping the dynamics audible	Catches peaks above a hard ceiling so nothing crosses it, then lets you raise loudness safely
Typical ratio	Roughly 2:1 to 8:1 — gentle, musical	10:1 and up, effectively a brick wall
Output ceiling	No hard cap; it shapes, it doesn't wall off	A fixed ceiling no peak passes (often around -1 dBTP for streaming)
You're meant to	Hear the effect as part of the sound	Not hear it — it's a safety net and a loudness tool
Where it sits	Earlier in the chain, shaping	Last, capping the summed peaks of everything before it

What does an audio compressor do?

An audio compressor reduces the level of any signal that rises above a threshold you set, by an amount governed by the ratio. That's the whole mechanism. When a vocal swings from a murmur to a belt, the compressor reins in the loud moments so the quiet ones don't get lost, and the take sits at a steadier level without anyone riding a fader by hand. Turn the recovered headroom back up with makeup gain and the soft passages come forward too. If you want the full picture of the effect on its own, our explainer on what audio compression is covers it end to end.

The controls are worth knowing because they're the same ones a limiter inherits:

• Threshold — the level above which the compressor starts acting.
• Ratio — how hard it pushes down once the signal is over the threshold. A 4:1 ratio means 4 dB over the threshold comes out as 1 dB over.
• Attack and release — how quickly it grabs a loud peak and how quickly it lets go.
• Knee — how gradually the compression eases in around the threshold (soft) versus snapping on abruptly (hard).
• Makeup gain — a level boost after the compression to recover the loudness you just tamed.

For everyday musical work you're usually in the 2:1 to 8:1 range. Our compressor ships three presets that show the spread: Vocal sits at a 3:1 ratio, Master keeps it gentle at 2:1, and Aggressive leans in at 12:1 — and that last one is already creeping into limiter territory, which is the whole point of what comes next. Everything runs on your device; your audio never leaves the browser.

What a limiter does — a compressor at the extreme

A limiter is functionally a compressor with the ratio cranked so high it becomes a wall. Push a compressor's ratio to 10:1, 20:1, or effectively infinity, add a hard output ceiling, and you've built a limiter: signal simply cannot pass the ceiling you set. Instead of gently shaping dynamics you're meant to enjoy, it catches the stray peaks that would otherwise clip and holds the whole file under a safe line. That's what lets you raise loudness with confidence — the limiter guarantees the top, so you can push everything up toward it without fear of an overload sneaking through. Our deeper piece on what a limiter is walks through the ceiling, the gain-reduction meter, and how hard is too hard.

The dedicated limiter on Vocal Cut isn't a standalone tool — it lives at the end of the browser mastering tool's chain, which is exactly where a limiter belongs. There's no separate limiter page because a limiter on its own, divorced from the mastering context it caps, isn't much use.

The ratio is the line between them

If you want one number that marks the border, it's the ratio. Somewhere around 10:1 a compressor stops sounding like it's shaping the audio and starts acting like a barrier — above that, it's doing a limiter's job whether the plugin calls itself a limiter or not. Below it, you're compressing; you can still hear the dynamics breathe. That's why the two effects blur together in practice: they're the same processor, and the ratio dial is the continuum running between them. A limiter is the far end of that dial paired with a hard ceiling; a compressor is everywhere gentler along it.

This also explains a common source of confusion. People treat "compressor" and "limiter" as two boxes you either own or don't, when really most limiting is just extreme compression with a guaranteed ceiling bolted on. The threshold, the ratio, the attack and release — same family. Only the intent and the settings change.

When to use each

Reach for a compressor when a part's dynamics are working against you and you still want to hear those dynamics: a vocal that ducks under the mix on soft lines and jumps out on loud ones, a bass where some notes bloom and others vanish, a drum bus that needs tightening. You're shaping how the part moves, evening it out so it sits in the track without flattening it. This is musical, per-part work, and the movement staying audible is the goal.

Reach for a limiter when the job is to catch peaks and raise overall loudness safely. On a finished mix, the limiter is what pins the peaks under a ceiling — often about -1 dBTP so streaming encoders don't clip — while you lift the whole file to a competitive level. You're not trying to hear it work; you want it invisible, doing two things at once: guaranteeing nothing overshoots, and buying you the loudness a modern release needs. If you're weighing how loudness tools relate more broadly, normalize vs master vs boost untangles the neighbouring options.

Most finished tracks use both, and not as an either/or. The compressor shapes; the limiter caps. Which leads to the last and most practical question: what order do they go in?

Signal-chain order: compressor early, limiter last

Order is not a preference here — it follows from what each effect needs to see. Compression does its dynamic shaping earlier in the chain, working on parts and buses while there's still shaping to do. The limiter sits last, because it has to see the summed peaks of everything ahead of it. Put a limiter early and it caps a signal that later stages will only push higher again, so it can't guarantee the final ceiling; put it last and it catches the true peak of the finished, combined signal.

You can watch this play out in a real mastering chain. As the audio mastering explainer lays out, the order runs EQ, multiband compression, stereo width, output trim, and then the limiter at the very end — the compression stage shapes tone and dynamics, and the limiter is the final gate that nothing gets past. If you're still sorting out where mastering itself fits against the earlier stages, mastering vs mixing draws that line.

So the short version: a compressor and a limiter are the same tool at different settings, the ratio is the line between them, and in a chain the gentle one shapes early while the extreme one caps last. If it's the compressor half you want to get hands-on with, how to use a compressor on audio walks through threshold, ratio, attack, release, knee and makeup gain one control at a time.

Frequently asked questions

What ratio turns a compressor into a limiter? Around 10:1 and up. Below that you're compressing — the dynamics still move and you can hear the effect working. Push the ratio to 10:1, 20:1, or effectively infinity and add a hard output ceiling, and the processor stops shaping and starts walling off: signal can't pass the ceiling. That extreme ratio plus a fixed ceiling is what makes a limiter a limiter rather than a strong compressor.

Do I need both a compressor and a limiter? For most finished music, yes, and they're not interchangeable. The compressor shapes dynamics earlier — evening out a vocal or tightening a bus while you still hear the movement. The limiter goes last to catch the combined peaks and raise loudness safely under a ceiling. One does musical shaping, the other does peak control and loudness. Skipping either leaves the track uneven or too quiet.

Can I use the compressor as a limiter? Partly. Set a very high ratio and a fast attack and a compressor will behave like a limiter, clamping peaks hard — that's genuinely what a limiter is. The gap is the guaranteed ceiling: a true limiter promises no peak ever crosses its output line, which is what makes it safe for the final loudness stage. A high-ratio compressor gets close, but a dedicated brick-wall limiter is what you want as the last gate.

Why does the limiter go last in the chain? Because it has to see everything before it. A limiter caps the summed peaks of the whole signal, so it needs to sit after every stage that could raise the level — EQ, compression, stereo work. Place it early and later stages push the signal past the ceiling it was supposed to guarantee. Placed last, it catches the true peak of the finished file and holds the final loudness safely.