Audio Effects
Apply professional effects to audio: echo, reverb, delay, chorus & equalization. Enhance recordings & create unique sounds. No audio software needed.
About Audio Effects
Free Online Tool
Audio Effects
Apply Reverb, Bass Boost, Treble Boost, and Denoise to any audio file — stack multiple effects simultaneously and preview the result before downloading.
How to Use This Tool (30 Seconds)
- 1Upload Your Audio File: Click the upload zone and select your file. MP3, WAV, OGG, FLAC, and M4A are all supported as input formats.
- 2Toggle Your Effects: Enable any combination of the four effects — Reverb, Bass Boost, Treble Boost, and Denoise — using the toggle switches. All active effects are applied simultaneously in the signal chain.
- 3Adjust Effect Intensity: Each active effect exposes an intensity slider. Dial in the strength of each effect independently — a light reverb can coexist with heavy bass boost without either being locked to a fixed level.
- 4Preview the Combined Result: Hit 'Play Preview' to hear the full effect stack applied to your audio in real time before committing to export. Toggle effects on and off mid-preview to A/B compare.
- 5Download the Processed File: Click 'Apply & Download.' All active effects are rendered into the output file in a single pass and download automatically to your device.
How Each Effect Processes the Audio Signal
All four effects are implemented using the browser-native Web Audio API node graph. Each effect is a discrete processing node — when multiple effects are enabled, the audio signal passes through each node sequentially in a DSP chain:
// Signal chain with all 4 effects active
AudioSource → DenoiseNode → BassBoostNode → TrebleBoostNode → ReverbNode → Output
// Bass Boost: BiquadFilterNode shelf at 200Hz
bassFilter.type = "lowshelf"; bassFilter.frequency = 200; bassFilter.gain = +12dB
// Treble Boost: BiquadFilterNode shelf at 3000Hz
trebleFilter.type = "highshelf"; trebleFilter.frequency = 3000; trebleFilter.gain = +10dB
// Reverb: ConvolverNode with impulse response buffer
convolver.buffer = generateImpulseResponse(duration, decay)
// Denoise: BiquadFilterNode bandpass + dynamic gate
noiseGate.threshold = −40dB; bandpass.frequency = 300–3400Hz
Denoise is applied first in the chain — removing noise before boosting frequencies prevents the boosted output amplifying hiss and hum alongside the signal. Reverb is applied last so it processes the already-shaped audio, producing a natural spatial effect rather than reverberating raw unprocessed input.
Effect Reference — DSP Method, Range & Use Case
| Effect | DSP Method | Frequency Target | Best Use Case |
|---|---|---|---|
| Reverb (Echo) | Convolution with impulse response | Full spectrum | Music, vocal warmth, spatial depth |
| Bass Boost | Low-shelf BiquadFilter +dB gain | 20–200 Hz | Music playback, podcast warmth, hip-hop |
| Treble Boost | High-shelf BiquadFilter +dB gain | 3,000–20,000 Hz | Vocal clarity, acoustic guitar, crisp speech |
| Denoise (Radio) | Bandpass filter + noise gate | 300–3,400 Hz | Voice calls, old recordings, noisy mic input |
Recommended Effect Combinations
Podcast Voice
Denoise + Treble Boost
Removes background hiss and sharpens vocal presence for clear, broadcast-quality speech.
Warm Music Mix
Bass Boost + Reverb
Adds low-end body and spatial depth — suits lo-fi, R&B, and ambient music.
Radio Effect
Denoise only
Bandpass filtering narrows audio to the 300–3,400 Hz telephone range for a classic radio voice.
Full Production
All 4 Effects
Denoise first cleans the signal, boosts shape tone, reverb adds environment. Use light intensity on each.
⚡ Pro Tip
When stacking Bass Boost and Treble Boost together, keep both intensity sliders below 60% — boosting both ends of the frequency spectrum simultaneously creates a smiley-face EQ curve that can cause the mid-range frequencies (500–2,000 Hz) where vocals and instruments live to sound recessed and hollow. This is a known mixing pitfall even professional engineers fall into. If the combined result sounds thin or the vocals disappear, reduce bass boost first — low frequencies consume far more headroom than highs and are the more common culprit.
Frequently Asked Questions
Q: Can I apply all four effects at the same time?
Yes. All four effects — Reverb, Bass Boost, Treble Boost, and Denoise — can be active simultaneously. The signal passes through each enabled node in a fixed chain order: Denoise → Bass Boost → Treble Boost → Reverb. This order is intentional and produces the most natural-sounding result.
Q: Why does the audio clip or distort when I apply Bass Boost?
Bass Boost adds gain to low frequencies, which raises the overall signal level. If the source audio is already recorded near maximum volume, the added gain pushes it past the 0 dBFS ceiling — causing digital clipping. Reduce the Bass Boost intensity slider or lower the source file's volume before applying the effect.
Q: What does the Denoise (Radio) effect actually remove?
Denoise applies a bandpass filter that passes only 300–3,400 Hz — the frequency range of human speech — and attenuates everything outside it. This eliminates high-frequency hiss, low-frequency hum, fan noise, and electrical interference. The 'Radio' label refers to the telephone-band frequency range it targets, which also produces a classic radio voice effect at full intensity.
Q: Does Reverb increase the file size of the output?
Reverb adds a decay tail to the audio, which slightly extends the total duration of the output file depending on the decay setting. This adds a small amount to file size — typically under 5% for moderate reverb settings. Bass Boost, Treble Boost, and Denoise do not change duration or file size meaningfully.
Q: Can I preview effects without downloading the file?
Yes. The preview player applies the full active effect stack in real time using the Web Audio API — no rendering or export required. You can toggle individual effects on and off during playback to instantly A/B compare the processed and unprocessed audio.
Q: Will applying effects reduce the audio quality of my file?
Effect processing requires re-encoding the output, which introduces minor quality loss for lossy source formats like MP3. For best results, upload a WAV or FLAC source file, apply your effects, and then convert to MP3 or AAC as a final step — this limits lossy re-encoding to a single pass.
Q: What is the best effect combination for cleaning up a noisy voice recording?
Enable Denoise first to strip background noise, then add a moderate Treble Boost (30–50% intensity) to restore vocal clarity that the bandpass filter slightly softens. This two-effect combination handles most microphone noise, room hum, and recording interference without making the voice sound processed or artificial.