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Supports MP3, WAV, FLAC, M4A, AAC, OGG, and Opus. Max file size: 200 MB.
Preview range: 00:00.00
Estimated size: -
Audio Effects is a browser-based audio processor for podcasters, creators, educators, and support teams. Load any audio file, layer up to eight effects (normalization, EQ, compression, bass boost, noise reduction, reverb, echo, stereo enhancement), preview a selection on the waveform, and export to MP3, WAV, FLAC, OGG, Opus, AAC, or M4A. Decoding, processing, and encoding all run locally with the Web Audio API + WebCodecs — files never leave your device.
Drag a file onto the dropzone, click Choose audio, paste a direct URL (the remote server must allow CORS), or click Sample audio to load a demo clip. Source info (duration, channels, sample rate, codec) appears in the file card.
Click the switch on each effect card to enable it, then click the card header to expand its controls. The signal chain runs in a fixed order: Noise Reduction → EQ → Compressor → Bass Boost → Reverb / Echo / Stereo Enhancer → Normalize. Use the audition range on the waveform + Preview Selection to listen to a short window before committing.
Choose MP3, WAV, FLAC, OGG, Opus, AAC, or M4A. Lossless formats (WAV/FLAC) ignore bitrate. Set channel mode (Mono / Stereo) and sample rate (Auto matches the source). Greyed-out formats are not encodable in your current browser.
Click Export. A progress bar reports encoder progress. When finished, a download link appears with the size and duration. The original file on your device stays untouched.
Raises overall loudness toward a target without clipping. Two modes: Peak (lifts the loudest sample to the target) and RMS (matches average loudness, more even but can clip transients). Use 1–3 dB headroom on Peak, or aim for −16 LUFS via RMS for podcasts.
Low-shelf filter centred near 100 Hz with adjustable gain (0–12 dB). Adds warmth to thin recordings or weight to music. Avoid over 6 dB on already-bassy material — it overwhelms the mid-range.
Pair of filters: a high-pass to cut sub-100 Hz rumble (HVAC, mic stand bumps) and a low-pass / de-esser to tame harsh hiss above 8 kHz. Increase the strength slider to widen the cut range. Strong settings can dull speech — start subtle.
Per-band gain (−12 dB to +12 dB) at 32 / 64 / 125 / 250 / 500 Hz / 1 / 2 / 4 / 8 / 16 kHz. Quick recipes:
Vocal clarity — slight cut at 250 Hz (boxiness), boost 2–4 kHz (presence) and 8 kHz (air).
Music warmth — boost 125 Hz, gentle dip at 500 Hz.
Phone-call effect — sharp cuts below 250 Hz and above 4 kHz.
Convolution-style ambience with controls for room size (decay length), damping (high-frequency absorption), and wet/dry mix. Tiny rooms (10–20%) add presence; large halls (60–80%) place the source in a big space. Keep wet under 35% for spoken word so the result stays intelligible.
Single-tap delay with feedback loop. Time sets the gap between repeats (try 250–500 ms for slap, 1.0 s for cinematic). Feedback controls how many repeats you hear (0% = single, 80% = many). Wet/dry mixes the echoed signal back in.
Reduces dynamic range — quiet parts stay audible while loud peaks are tamed. Threshold (where compression kicks in), Ratio (how much: 2:1 = gentle, 8:1 = limiter-ish), Attack (how fast it grabs peaks), and Release (how fast it lets go). For voice: threshold −18 dB, ratio 3:1, attack 5 ms, release 100 ms.
Widens stereo material with a subtle Haas-style delay between channels. Width 0% leaves the source untouched, 100% spreads aggressively (may sound phasey on summed mono). Has no effect on mono input.
Waveform + audition range: drag the two handles to mark a preview window. Click Preview Selection to render the chosen range with the active effect chain applied — useful for fast A/B without committing to a full export.
Format: MP3 / WAV / FLAC / OGG / Opus / AAC (ADTS) / M4A. Lossy formats expose the bitrate dropdown (128 / 192 / 256 / 320 kbps); lossless formats hide it.
Channels: Mono mixes both inputs to one channel (smaller file, fine for voice). Stereo preserves spatial information (music, ambience).
Sample rate: Auto inherits the source. 44.1 kHz for music, 48 kHz for video alignment, 96 kHz only when downstream tools require it.
No. Decoding, preview rendering, effects processing, and the final export all run inside your browser using the Web Audio API and WebCodecs. Files never leave your device.
Any audio format your browser can decode — typically MP3, WAV, M4A, AAC, OGG (Vorbis/Opus), and FLAC. URL mode requires the remote host to send CORS headers.
MP3, WAV, FLAC, OGG (Vorbis), Opus, AAC (ADTS), and M4A. Codecs your browser cannot encode natively (e.g. MP3 in some browsers) are polyfilled via lazy WASM encoders so all formats work.
Preview only renders the audition range you selected on the waveform. Export renders the full file and re-encodes it into the chosen output format and bitrate, which is roughly proportional to the source duration.
Yes — effects are processed in a fixed signal chain (Noise Reduction → EQ → Compressor → Bass Boost → Reverb / Echo / Stereo Enhancer → Normalize). Toggle any subset on. For voice work, Noise Reduction + Compressor + EQ is a solid baseline.
Normalize raises the loudest peak (or perceived loudness) toward a target. If the source has rare loud spikes, Normalize boosts everything else to that ceiling. Pair it with Compressor first to tame those peaks before normalizing.
Wet is the processed (reverberant or delayed) signal, Dry is the original clean signal. Mix decides how much wet is blended back. 100% wet sounds drowned, 0% wet bypasses the effect — most material sits between 20% and 40%.
If the source has only one channel, exporting to stereo duplicates it across both channels. Stereo Enhancer requires two channels of distinct material to produce a wide image — it does nothing on mono sources.
Auto matches the source. Use 44.1 kHz for music distribution, 48 kHz for video alignment, and 96 kHz only when downstream tools require it. Higher sample rates do not improve audible quality of already-recorded material.
The original file is preserved on your device. Only the exported file is the modified version. Reload the original or toggle effects off and re-export at any time.