By Team Hypomnema · Updated October 19, 2026
Use six parametric bands, high/low-pass and shelf filters, notch filters, presets and an accurate response graph.
Prepare and preview
Add an audio recording and trim the selection.
Load a preset or select a band. Choose its filter, frequency, gain and Q; leave headroom with the preamp.
Prepare the encoded preview, compare with the source and download MP3 or WAV.
Limits and output quality
Browser-supported MP3, WAV, M4A, AAC, OGG, FLAC and WebM; mono or stereo only. One file up to 20 MB and two minutes. Processing runs locally at 44.1 kHz in a cancellable worker. WAV is 16-bit PCM. MP3 re-encoding is lossy, may add frame padding and can use lower sample rates at low bitrates. Source metadata is not retained. The encoder reduces overall gain when needed to prevent sample clipping. Six second-order RBJ biquad filters run in sequence. Q changes resonance, including shelf-filter shape. The graph calculates the same filters used for audio and displays a clipped ±24 dB range; it is not a measured spectrum. Filters start with zero state at the trim boundary. Strong boosts and resonances can raise peaks; export peak protection changes overall level. This is not noise removal or restoration of missing frequencies.
Try the workflow
Keep your original documents and review the output. You can also browse all guides or contact Team Hypomnema.