Web Audio Mastering

A desktop app for mastering AI-generated music (Suno, Udio, etc.) or any other audio to streaming-ready quality.

Try it in your browser - No installation required!

Source: https://github.com/entrepeneur4lyf/Web-Audio-Mastering

Brought to you by stonedoubt studio

Features

Playback & Analysis

• FX A/B (On/Off) - Instant before/after comparison, with optional Level Match for fair loudness comparisons
• Waveform + Scrub - Click-to-seek waveform and scrubber for fast navigation
• Spectrogram (Live) - Real-time frequency heatmap (great for spotting harsh bands, resonances, and sub build-up while you tweak)
• Full-chain Metering - Real-time stereo peak metering (FX ON reflects the mastering chain, including the final limiter ceiling)
• DC Offset Detection - Detects and removes DC offset on load (badge shown when cleanup was applied)

Loudness & Dynamics

• Input Gain - Adjust input level before processing (-12dB to +12dB)
• Loudness Normalization - Automatically adjusts to Spotify's -14 LUFS standard
• Soft Clipper (Pre-Limiter) - Adds punch and headroom when pushing loud masters (common mastering trick)
• True Peak Limiting - Prevents clipping with adjustable ceiling (-3dB to 0dB)
• Glue Compression - Light compression to glue the mix together and add punch
• De-harsh - Hybrid dynamics + dynamic EQ to tame harshness and resonances in AI audio

EQ & Tonal

• 5-Band Parametric EQ - Fine-tune frequencies (80Hz, 250Hz, 1kHz, 4kHz, 12kHz)
• EQ Presets - Flat, Vocal Boost, Bass Boost, Bright, Warm, AI Fix
• Cut Mud - Reduce muddy frequencies around 250Hz
• Add Air - Sparkle and brightness with 12kHz high shelf boost

Low End

• Clean Low End - Removes sub-bass rumble below 30Hz

Stereo

• Stereo Width - Adjustable stereo image (0% mono to 200% extra wide) with real-time preview
• Mono Bass - Narrows bass below ~200Hz for better club/speaker mono compatibility

Output

• Output Presets - Quick-switch sample rate/bit depth (48kHz/24-bit recommended)
• High-Quality WAV Export - Lossless output with all processing applied (master preview matches export)

See DSP-SIGNAL-CHAIN.md for more details on the DSP signal chain.

Download

Get the latest release for your platform:

• Windows - .exe portable
• macOS - .dmg disk image
• Linux - .AppImage

Usage

1. Drag & drop an audio file (MP3, WAV, FLAC, AAC, M4A)
2. Preview with the built-in player
3. Adjust EQ and mastering settings
4. Toggle FX bypass to compare before/after
5. Click "Export Mastered WAV"

Building from Source

# Install dependencies
npm install

# Run in development
npm start

# Build web output (for GitHub Pages / static hosting)
npm run build:web

# Preview the production build locally
npm run preview

# Build for your platform
npm run build:win    # Windows
npm run build:mac    # macOS (requires Mac)
npm run build:linux  # Linux

Tech Stack

• Electron 39
• Vite 7 (build system)
• Web Audio API (preview and export processing)
• Pure JavaScript LUFS measurement (ITU-R BS.1770-4)
• WaveSurfer.js (waveform visualization)

License

ISC

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Acknowledgements

This project is based on Suno-Song-Remaster by SUP3RMASS1VE, licensed under the ISC License.

ISC License

Copyright (c) SUP3RMASS1VE

Permission to use, copy, modify, and/or distribute this software for any
purpose with or without fee is hereby granted, provided that the above
copyright notice and this permission notice appear in all copies.