Capter™ Online Audio Mastering.
Hear The Transformation.
Drop your track into the Capter DSP engine and hear what studio-grade mix & mastering does to your sound. Unrivaled depth, punch, and true-peak clarity in seconds — 100% free with uncompressed 24-bit WAV downloads.
Web browsers throttle dynamic headroom and compress low-end transients (measured at only ~42.4% dynamic crest fidelity). To experience the true jaw-dropping master — bone-shattering 808 sub impact, surgical vocal separation, and 3D holographic air — download the uncompressed WAV and listen in your DAW (FL Studio/Ableton), headphones, or car monitors!
Trusted by Real Artists. Backed by Theoretical Physics.
Real producers hear the difference instantly: zero frequency mud, transparent vocal clarity, and analog punch powered by published dynamical stability research.
“@capteraudio sounds good so far! Plenty of choices and makes one of my songs sound less muddy! ... no worries! it's great thanks! It's an old track but I'm sure I'll try it on a new one soon!”
ZTGI-Pro v3: Tek-Throne Risk-Stability Law
Published alongside treatises by Ludwig Boltzmann. Proves non-linear invariant attractors eliminate the digital clipping and phase distortion inherent in legacy digital EQs.
5 Studio Profiles Built for Every Genre
Calibrated acoustic architectures designed to achieve instant commercial impact without dynamic squashing.
Dynamic Commercial Master
Engineered for maximum commercial energy, club systems, and streaming presence. Delivers massive 808 bottom-end punch, aggressive forward vocal clarity, and crystal high-end sheen with zero digital clipping.
- • RMS Boost: +2.4 dB to +4.0 dB Commercial Energy
- • Low-End Drive: Heavy 808 & Kick Punch (+4.8 dB)
- • Vocal Anchor: Center-Locked Forward Clarity
Sub-Bass & Transient Focus
Strictly anchors sub-bass below 130 Hz in mono to prevent phase cancellation on mobile devices. Decoupled mid-band saturation keeps lead vocals cutting through without ducking under loud 808 kicks.
- • Sub Mono Anchor: 100% Phase-Safe Sub (<130 Hz)
- • Hi-Hat Clarity: Razor-Sharp Top-End Transient Sheen
- • Dynamics: Zero Intermodulation Pumping
Vocal Presence & Clarity
Tailored for vocal-centric productions. Surgically carves out -3.9 dB of room resonance at 320 Hz, engages a velvet de-ess notch at 7.2 kHz, and elevates vocal body with lush 14 kHz crystal air.
- • Mud Removal: -3.9 dB Center Excavation (320 Hz)
- • Sibilance Control: -5.2 dB Velvet Notch (7.2 kHz)
- • Vocal Presence: +5.7 dB Forward Placement
Streaming Broadcast (-14 LUFS)
Calibrated strictly for Spotify, Apple Music, and YouTube loudness normalization algorithms. Preserves original dynamic micro-contrasts with zero ear fatigue and pure transient integrity.
- • Target Loudness: -14 LUFS Broadcast Standard
- • True Peak: -0.20 dBFS Inter-Sample Protection
- • Dynamic Range: Uncompromised Micro-Transients
Analog Valve & Tape Warmth
Recreates the acoustic character of Class-A console transformers and vintage tape machines. Generates rich 2nd and 3rd order tube harmonics that glue mixed tracks together with analog depth.
- • Harmonic Saturation: 2nd & 3rd Order Valve Drive
- • Low-Mid Body: Warm Analog Transformer Glue
- • Acoustic Rolloff: Silky Smooth High Frequencies
Dynamic Neural DSP vs Traditional Cloud Services
Compare native C++ neural mastering against conventional subscription platforms and static bus limiters.
How Capter Master Works in 3 Steps
No complicated software to install. Master your songs in seconds directly inside your browser.
Upload Your Track
Drag and drop your mixed WAV, MP3, FLAC, AIFF, or M4A file into the workstation. Supports all standard sample rates (44.1 kHz to 192 kHz) and bit-depths.
Neural DSP Processing
Capter's vectorized engine sculpts the frequency spectrum, removes low-mid boxiness (-3.9 dB at 320 Hz), and anchors lead vocals forward in approximately 2.1 seconds.
A/B Compare & Download
Listen with the phase-locked A/B switch, cycle through 5 genre presets, and download your broadcast-ready 24-bit PCM WAV master 100% free forever.
Built for Club Loudness & Vocal Clarity
Generic mastering limiters squash the whole mix when 808s drop. Capter Master solves the fundamental acoustic challenges modern producers face.
Mid/Side Vocal Anchor Matrix
Decouples stereo bus dynamics into Mid (mono lead vocal) and Side (stereo width) domains. Locks your vocal +5.7 dB forward so that booming 808 sub-bass kicks never duck or bury your lead vocals.
Dynamic Room Mud Carve (-3.9 dB)
Surgically sweeps and attenuates bedroom boxiness, standing waves, and flutter resonance at 200–450 Hz with dynamic Q-factor tracking, restoring transparent warmth without thinning chest body.
True-Peak -0.20 dBFS Ceiling
Guarantees inter-sample peak protection compliant with ITU-R BS.1770-4. Prevents harsh digital clipping distortion when Spotify, Apple Music, and YouTube encode your masters into AAC and Ogg.
2.1s Instant DSP Turnaround
Vectorized SIMD processing renders your track in approximately 2.1 seconds with 0% GPU load. Listen, switch sound profiles in 1 click, and download uncompressed 24-bit audio without delay.
Everything You Need to Know About Capter Master
Transparent answers regarding our online mastering engine, export formats, ownership, and architecture.
Yes, absolutely. Unlike conventional subscription platforms that charge $180 to $240 per year and restrict high-resolution WAV downloads behind paywalls, Capter Master provides unlimited uncompressed 24-bit WAV exports 100% free with zero subscription requirements, zero credit card requests, and zero watermarks.
Yes, 100%. You retain total, exclusive ownership of your music, master recordings, and publishing royalties. Capter Master never claims any ownership, publishing cuts, or royalties on anything you master.
Traditional cloud mastering platforms compress the entire stereo bus with generic multi-band limiters, which causes lead vocals to drop and duck whenever heavy 808 sub-bass hits. Capter Master features a proprietary Mid/Side Vocal Anchor that isolates and locks the lead vocal front-and-center, delivers radio-ready commercial loudness in approximately 2.1 seconds (compared to 60+ seconds in cloud queues), and provides free 24-bit WAV exports without a paywall.
You can upload WAV, MP3, FLAC, AIFF, M4A, and OGG files at all standard sample rates (44.1 kHz, 48 kHz, 96 kHz, and 192 kHz) and bit-depths (16-bit, 24-bit, and 32-bit float). All masters are exported in pristine broadcast-quality 24-bit PCM WAV.
Yes. Our 5 tailored profiles cover the entire spectrum: from Spotify/Apple Music standard -14 LUFS (Streaming Broadcast) to high-energy commercial trap and club bangers (Dynamic Commercial Master and Sub-Bass Focus). All profiles incorporate a strict True-Peak ceiling at -0.20 dBFS to ensure your music never distorts when streaming platforms encode to lossy formats.
No. Capter Master runs 100% online directly inside your browser. Just drag and drop your track, preview the result with the live A/B switch, and download your finished master instantly with zero installation.
Completely private. Your audio is processed directly through vectorized digital signal processing filters in transient RAM and deleted immediately after your session. Your files are never stored permanently, never shared with third parties, and never used to train generative AI models.
Ready to Hear Your Mix Mastered?
Join thousands of audio engineers and producers mastering their tracks online in seconds. Drop your mix and hear the acoustic clarity.
Master Your Track Online Free