Enhance Audio Quality Online Free
A free online audio enhancer for improving clarity, boosting bass, reducing noise, and normalizing volume. Supports MP3, WAV, FLAC, and other formats — all processing in your browser.
How to Enhance Audio Quality
Drag and drop an audio file into the upload zone or click to browse. Supports MP3, WAV, FLAC, OGG, M4A, AAC files up to 1 GB.
Select the type of content: Speech, Podcast, Music, or Voice Recording. Each preset applies an optimized chain of audio filters.
Choose enhancement strength: Light for subtle improvement, Medium for balanced processing, or Strong for maximum effect.
Click "Enhance" and wait for processing. Compare before and after with the built-in player, then download the enhanced file.
Improve audio clarity, balance, and loudness — free, in your browser
Custom Mode: Parameter Reference
Adjust each parameter to shape your sound. Changes to filters, EQ, dynamics (threshold, ratio, attack, release, knee), de-esser and output gain are heard instantly during playback. Only noise reduction and noise gate are applied during export.
Filters
- High-pass (20–500 Hz) — removes low-frequency rumble: room hum, wind noise, handling sounds. Set to 80–100 Hz for voice, keep at 20 Hz for music.
- Low-pass (2k–20k Hz) — removes harsh high frequencies and hiss. Set to 12–14 kHz for speech, keep at 20 kHz for music to preserve full spectrum.
Equalizer — 6 Bands
- Bass (100 Hz) — controls low-end body and fullness. Boost for thin recordings, cut to reduce boominess or room resonance.
- Warmth (250 Hz) — adds richness and body to voice. Boost for thin or cold-sounding recordings, cut if the sound is muddy or boxy.
- Mid (1 kHz) — main vocal frequency range. Boost to bring voice forward, cut to push it back and create space.
- Presence (3 kHz) — articulation and definition. Boost to make speech more intelligible, cut to soften harsh or aggressive recordings.
- Clarity (5 kHz) — brightness and consonant detail. Boost for dull recordings, cut to tame sibilance or brittle sound.
- Air (10 kHz) — sparkle and openness. Boost to add "air" and shimmer, cut if the recording sounds too bright or noisy.
Dynamics
- Threshold (0 to −60 dB) — sets the level above which the compressor activates. Lower values mean more of the signal gets compressed.
- Ratio (1:1 to 20:1) — how much to reduce signal above the threshold. 2–4:1 for gentle leveling, 8–20:1 for heavy compression.
- Attack (0.1–100 ms) — how fast the compressor reacts when signal exceeds the threshold. Short attack (1–10 ms) catches transients, long attack (20–100 ms) lets them through.
- Release (10–1000 ms) — how fast the compressor stops reducing after signal drops below threshold. Short release (50–100 ms) for speech, long (200–500 ms) for music.
- Knee (0–40 dB) — transition smoothness around the threshold. 0 dB = hard knee (abrupt), 20–40 dB = soft knee (gradual, more natural).
- De-esser (0–12 dB) — reduces sibilance (harsh "s", "sh", "ts" sounds). Applies a narrow cut around 6.5 kHz. Start with 3–6 dB.
Output
- Gain (−12 to +12 dB) — final volume adjustment before export. Use to compensate for any volume changes from other settings.
Features
Frequently Asked Questions
How does audio enhancement work?
The tool applies a chain of professional audio filters: frequency equalization boosts clarity and warmth, dynamic compression evens out volume differences, loudness normalization brings levels to broadcast standards, and a limiter prevents any clipping or distortion.
Which preset should I choose?
Choose "Speech" for voice messages and meetings, "Podcast" for interviews and talks, "Music" for songs and instrumentals, and "Voice Recording" for phone recordings and dictaphone files. The Voice Recording preset also applies noise reduction.
Is it safe? Are my files uploaded to a server?
Completely safe. All processing happens locally in your browser using WebAssembly technology. Your audio files are is guaranteed.
Can this tool fix really bad audio?
The tool significantly improves audio clarity, volume balance, and overall sound quality. It works best on recordings with low volume, unbalanced frequencies, or inconsistent loudness. For heavily distorted or extremely noisy audio, results may be limited — but even then, the "Strong" preset can make a noticeable difference. For heavily noisy recordings, use the noise remover first.
Is this the same as an audio compressor?
Yes, this tool includes a professional dynamic range compressor with adjustable threshold and ratio. It evens out volume differences by making quiet parts louder and loud parts softer. In Custom mode, you can fine-tune threshold, ratio, noise gate, and de-esser for precise control.
We can — and it's free! Just send us a quick message with your idea. If you'd like to discuss it in detail, leave your email and we'll get back to you. You can stay anonymous.
