LUFS·M
— approx
Peak L
— dB
Peak R
— dB
Limit GR
0.0 dB
SIGNAL

TheHigh-End Mastergenre-aware mastering · in your browser

Clean it up, shape the tone, match the loudness —
one polished master, export-ready for every platform.
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Voicing — genres · type to search · click again to return to Flat
No genre matches — try another word.
Character & intensity — a style layered on top of the voicing · click again to unselect
Clean-up · runs before mastering
Strip steady hiss and mains hum first, so the limiter doesn't amplify them later. This is a separate offline pass: it learns the track's noise floor by spectral analysis, then subtracts it. Best for field/room/tape noise — not a fix for heavy distortion.
Mains hum removalOff
Noise reduction40 %

Tone · Low / Mid / High

3-band tilt — shelves on the ends, sweepable bell in the middle
Mid focus1.2 kHz
Sub-filter (high-pass)24 Hz

Dynamics · Glue + Drive

cohesion and harmonic weight before the brickwall
Compression0 %
Harmonic drive0 %
Multiband glue0 %
De-ess (sibilance)0 %
Input trim0.0 dB

Image · Loudness target

stereo width (mono-safe) and the level your master is rendered to
Stereo width100 %
Bass mono (below)Off
Target loudness−14 LUFS
True-peak ceiling−1.0 dBTP
Delivery targetSpotify
−14 LUFS · −2 dBTP · covers Spotify + HiFi (lossless)
M/S EQ · shape centre and sides independently
Mid = mono/centre content (vocal, bass, kick). Side = stereo content (width, air, reverb). Classic moves: lift Side highs for air, trim Side lows for a tighter centre, add Mid presence for an upfront vocal.
MIDcentre · mono
SIDEwidth · stereo
Reverb · master glue / space
Subtle send after the tone EQ, before dynamics — sets the track in one room. Mastering doses live under ~15%; higher is a creative/stem effect. Off by default; Spatial & Cinematic characters add their own touch.
TypeOff
Mix (send)0 %
Pre-delay20 ms
Spectrum
Phase correlation 1.00
+1 mono · 0 wide · below 0 = phase issues, check mono
Pre-flight analysis
Renders your master and measures it — integrated loudness, dynamic range, true peak, and how each platform will re-level it.
—LUFS·I
—LRA·LU
—True Pk
—Crest
Per-platform playback level
Reference track · A/B
Load a commercial track you like. A/B plays it loudness-matched to your target, so you compare tone — not volume.
Tags — embedded into the exported WAV (RIFF INFO)
Tune tone & dynamics on playback. The exact loudness match and true-peak limiting are applied during render, in two analysis passes.

Everything runs locally in your browser — nothing is uploaded.
A/B is level-matched: BYPASS plays your source at the same loudness, so you judge tone — not volume.

Free online audio mastering, right in your browser

The High-End Master is a free online mastering tool that turns a finished mix into a polished, release-ready master — without installing plugins, paying per track, or uploading your music to a server. Everything happens locally in your browser, so your files stay private.

Genre-aware mastering for 120+ styles

Unlike a one-size-fits-all chain, The High-End Master adapts its EQ, compression, stereo width, saturation and limiting to the genre you're working in — from trip-hop, techno, house and hip-hop to rock, folk, classical, ambient and beyond. Pick a style, choose a character and intensity, and let an adaptive chain shape the tone to fit.

Loudness that competes on every platform

A two-pass, loudness-targeted export with true-peak limiting gets your track to the right level for Spotify, Apple Music, YouTube, Tidal, Amazon Music, SoundCloud and club or CD delivery — with a level-matched A/B so you judge tone, not volume. It's a fast, free way to master a song online and hear the difference before you release.

Built for independent artists. If it helped you get your music out there, support the project on Patreon.