In audio production, maintaining a clean signal path separates amateur recordings from professional results. Unwanted noise—from computer fans, room ambiance, guitar hum, or preamp hiss—can degrade clarity and ruin a mix. Noise gates and expanders are essential tools for dynamic control, and many high-quality free plugins exist to handle these tasks without costing a dime. This article explores the best free noise gate and expander plugins, explains how they work, and offers practical advice for getting the most out of them.

What Are Noise Gates and Expanders?

Both noise gates and expanders process audio based on signal level, but they achieve different results. A noise gate acts as a switch: when the input signal falls below a set threshold, the gate closes, muting the audio entirely (or reducing it to a floor level). This is ideal for silencing background noise between vocal phrases, drum hits, or guitar passages. A basic gate is like a binary on/off control.

An expander works more subtly. Instead of completely muting low-level signals, it reduces their gain by a ratio (e.g., 1:2 or 1:4). The effect is a dynamic narrowing that makes quiet sounds quieter while leaving louder sounds untouched. Expanders are often used to tighten drum room sounds, reduce reverb tails, or manage noise floor without abrupt chopping. A downward expander is the most common type—it attenuates signals below the threshold—and many plugins combine gate and expander modes in one interface.

Understanding the difference helps you choose the right tool. A gate is best for aggressive noise removal on isolated tracks (e.g., vocals with long pauses). An expander suits more natural control on busier material or when you need to preserve some ambient texture.

Why Free Plugins Are Worth Your Time

Paid noise gate plugins often boast extra features like advanced sidechain EQ, lookahead, or multiband processing. But many free options are surprisingly capable, offering transparent gating, smooth expansion, and even unique character. For beginners on a budget, or pros needing a quick lightweight solution, free plugins can handle the vast majority of gating tasks. They are also excellent for learning—you can experiment with settings without financial pressure. The plugins below have been vetted by the community and are stable, well-maintained, and compatible with all major DAWs.

Top Free Noise Gate and Expander Plugins

1. TDR Nova

TDR Nova (Tokyo Dawn Records) is a dynamic equalizer that includes a built-in noise gate and expander section. While its primary function is EQ, the "Gate/Exp" module provides threshold, range, attack, release, and ratio controls. You can shape the frequency response of the gate using the equalizer’s bands—a powerful trick for sidechain gating by frequency. For example, you can gate a kick drum only on specific low frequencies while ignoring cymbal bleed. TDR Nova is available in a free version that lacks some presets but includes all core functionality. It is a Swiss Army knife for dynamic control. Download TDR Nova.

2. ReaGate (ReaPlugs)

ReaGate is part of the ReaPlugs package from Cockos, the developers of REAPER. It is a straightforward gate with threshold, attack, hold, release, and a dedicated 12 dB/octave filter for sidechain. The interface is clean and responsive, and the plugin is lightweight on CPU. ReaGate also includes a ducking mode and a pre-open option for fast-moving percussive sounds. It works in any DAW that supports VST or AU. For a no-frills yet fully featured gate, ReaGate is hard to beat. Get ReaPlugs.

3. Gatey Watey

Gatey Watey by Dead Duck Software is a simple, elegant noise gate designed for speed. The interface shows a big threshold knob, attack and release knobs, and a level meter with a gate indicator. Its simplicity makes it ideal for podcasters or live streamers who need to cut out background noise quickly without diving into complex parameters. Despite the minimal controls, Gatey Watey uses a smooth algorithm that avoids clicking or chattering. It is available as a VST for Windows and macOS.

4. MNoiseGate

MNoiseGate from MeldaProduction is part of the free MFreeFx bundle. It offers standard gate controls: threshold, knee (for smoother transitions), attack, release, and a lookahead feature to catch transients. The visual feedback includes a waveform display and a gain reduction meter. MNoiseGate also supports MIDI key triggers and stereo linking. Melda’s free plugins are known for their extensive parameter options, and MNoiseGate is no exception—you can even adjust the gate’s output ceiling. Download MNoiseGate.

5. Smooth Gate by Sleepy-Time Records

Smooth Gate is a lesser-known but highly effective free VST gate with a focus on transparency. It features a variable hysteresis control, which helps prevent the gate from chattering on borderline signals. With threshold, attack, hold, and release, plus a high-pass filter, Smooth Gate excels at cleaning up ambient noise without artifacts. Its interface is small but functional, making it a great choice for CPU-limited sessions.

6. Noise Gate by Analog Obsession

Analog Obsession produces free analog-modeled plugins with character. Their Noise Gate emulates a classic hardware gate unit, offering threshold, range, attack, and release. The "Range" knob sets the maximum attenuation, acting like a combination of gate and expander. The plugin adds a subtle warmth that can glue a track together. It works well on drums and guitars where you want both noise control and a touch of mojo. Available as VST3 and AU.

7. TDR Kotelnikov (with gate sidechain)

While primarily a compressor, TDR Kotelnikov includes a built-in gate on its sidechain filter. You can use its sidechain EQ to listen to a specific frequency band and gate the main signal accordingly. This is a creative approach for problem-solving—say, gating a snare mic based on the snare’s fundamental frequency to reduce hi-hat bleed. Kotelnikov is a free, high-quality dynamic processor that adds expander-like behavior when used with extreme settings. Download TDR Kotelnikov.

Key Features to Look For in a Noise Gate or Expander

When evaluating free plugins, pay attention to these parameters. They determine how natural and effective the gating will be.

  • Threshold: The level below which the gate or expander activates. Set it just above the noise floor for clean results.
  • Attack: How quickly the gate opens when the signal exceeds threshold. Fast attack preserves transients; slower attack can soften abrupt starts.
  • Hold: How long the gate stays open after the signal falls below threshold. Essential for sustaining words or notes without premature cuts.
  • Release: The time it takes for the gate to close after hold ends. Short release can sound choppy; long release may let noise slip back in.
  • Range (or Floor): The amount of attenuation when the gate is closed. Full mute (range = -∞ dB) vs. partial attenuation (e.g., -20 dB) which acts more like an expander.
  • Knee: Smooths the transition around the threshold. A soft knee makes the gate less obvious on borderline signals.
  • Sidechain Input / Filter: Allows the gate to respond to an external signal or a filtered version of the signal itself. Useful for frequency-aware gating (e.g., open the gate only when a specific tone is present).
  • Lookahead: A short delay that lets the gate anticipate transients. Prevents clicks on fast attacks, but adds latency.
  • Visual Feedback: Gain reduction meters, waveform displays, or a response curve help you dial in settings accurately.

For expanders specifically, the ratio is crucial. A ratio of 1:2 means for every 1 dB of signal below threshold, the output drops 2 dB. Higher ratios approach gate-like behavior. Some expanders also offer a “depth” or “maximum reduction” control.

How to Use a Noise Gate Effectively

Proper gating is more art than science. Start with these steps for clean results.

Step 1: Find the Noise Floor

Play only the silent portions of your track. Note the RMS level of the noise (e.g., -60 dB). Set your threshold about 3–6 dB above that level. If you set it too low, the gate will never close; too high, and it will cut into the desired sound.

Step 2: Adjust Attack and Release

For percussive sounds (drums, plucks), a fast attack (1–5 ms) preserves punch. For vocals or sustained instruments, a slower attack (10–30 ms) avoids clipping the beginning of syllables. Set release so that it closes naturally after the sound ends—tune by ear while looping a short phrase. Overly short release causes “gated reverb” artifacts; overly long release lets noise in.

Step 3: Use Hysteresis or Hold

If the gate chatters (rapidly opens and closes) on noise near the threshold, increase hold time or hysteresis. This stabilizes the gate so it stays open for a minimum duration. Many free plugins include hold or “damping” for this reason.

Step 4: Sidechain for Precision

When gating a microphone that picks up multiple sources (e.g., a drum overhead), use a sidechain filter to key the gate to only the instrument you want. Some plugins allow you to route a separate audio source to the sidechain input—for instance, gating a reverb send with a dry snare track to open the reverb only when the snare hits. This creates a classic “gated reverb” effect used in 80s drums.

Step 5: Blend with Expander Mode

For a more natural reduction, use an expander instead of a gate. Set the range to a moderate value (e.g., -15 dB) and adjust the ratio (e.g., 1:3). This lowers background noise gradually, preserving some room tone for realism. Many free plugins offer a gate/expander switch or a continuous range control.

Common Applications

Vocals

Noise gates remove breath noises, chair squeaks, and preamp hiss between vocal lines. On spoken word or podcasts, a gentle expander is often better to avoid choppiness. Use a low threshold and slow release for transparent results.

Drums

Toms and snare benefit from gating to cut bleed from cymbals and hi-hats. Set a fast attack (2 ms) and medium release (100–200 ms). For a heavily gated “80s drum” sound, crush the release time to 20–30 ms and add reverb after the gate. Sidechain the gate to the kick or snare for tight rhythm.

Electric Guitar

Clean up hum and buzz between chords. Use a gate with a high-pass filter to avoid cutting low-end sustain. For distorted guitars, an expander can tighten palm mutes without cutting the natural decay.

Podcasts and Live Streaming

Automatic noise removal is essential for clear broadcasts. Gatey Watey or ReaGate with a low threshold works well. Set a fast attack to catch the start of speech, and a hold long enough to avoid cutting off ends of words. Many streamers also use a noise gate on their microphone input in OBS.

Room Mics and Ambience

Use an expander with a soft knee to reduce the noise floor of room microphones during quieter sections, preserving the natural reverb tail. This is common in orchestral or choir recordings.

Conclusion

Free noise gate and expander plugins are powerful enough for professional use. Whether you need a simple gate for live streaming, a precise dynamic EQ with gating for mixing, or an analog-style character gate for color, the options listed here cover a wide range of needs. Experiment with different plugins and settings to find what works best for your source material. Clean audio is the foundation of a great mix—and these free tools put that foundation within everyone’s reach. For further reading on dynamic processing fundamentals, check out Sound On Sound’s guide to gates and expanders.