Release-ready masters, made in your browser.
Hear every move, measure every dB.
High quality music mastering by our own engine — no AI model. The same track and settings always give the same result, and you can hear and adjust every change. Real LUFS and true-peak metering for Spotify, Apple Music, YouTube, club, broadcast and vinyl. No card, no subscription.
Hear it on your own track
Drop a file and listen. Three independent compressors work on lows, mids and highs separately — and you can watch each one as it happens. Nothing is uploaded; the processing runs on your device.
Mastering plans — from a single track to monthly plans
No hidden fees. Cancel anytime. Annual plans save 2 months.
Prices exclude VAT. VAT is added at checkout based on your country.
- Free1 export with a watermark
- Pro€8.99/month or €89.90/year
- Studio€12.99/month or €129.90/year
- Pay Per Track€4.94 per track, one-time
Prices exclude VAT; VAT is added at checkout based on your country.
Open Studio to see current plans →Mastering for every platform — Spotify, Apple Music, YouTube and more
Each platform normalises loudness differently. Quantara normalises toward the reference for your destination and holds a true-peak-safe ceiling — club, broadcast and vinyl targets included.
Genre presets: mastering tuned for 34 styles
Pop, Hip-Hop, EDM, Metal, Jazz, Afrobeats, K-Pop, Cinematic and more — each preset is a genre-aware starting point. You dial in every stage from there; mastering always responds to the track in front of you, not just a label.
Created with AI. Finished with Quantara.
Generators give you a mix. Mastering is what makes it sit alongside commercial releases — consistent loudness, true-peak safety for streaming codecs, and the final tonal balance.
Export from your generator, drop the file here, and hear every change before you commit. Mastering by our own engine — not an AI model guessing at your track.
What a professional mastering chain gives you
Built by engineers, for producers.
Full Mastering Control
Tone, dynamics, stereo image and loudness, with a 31-band graphic EQ and a true-peak-safe ceiling. Every control adjustable in real time, with A/B bypass. Mastering by our own engine — no AI model.
all major Loudness Targets
Normalised references for Spotify, Apple Music, YouTube, Tidal, Amazon, Deezer and iTunes; loud creative presets for Club, Beatport and SoundCloud; plus specialised targets: EBU R128 broadcast and vinyl.
34 Genre Starting Points
7 categories: Pop & Mainstream, Urban, Electronic, Rock & Metal, Latin & World, Acoustic & Classical, and Other. Each is a sensible starting point for the genre — then you adjust to the actual track.
Real-time Metering
Live spectrum, BS.1770 loudness (LUFS), true-peak detection, waveform with click-to-seek, and gain-reduction read straight from the compressor and limiter — not estimated.
Reference Matching
Upload any commercial track as a reference and match its tonal balance, dynamics and loudness. Available on Pro and above.
Multi-Format Export
WAV 16-bit (CD quality), WAV 24-bit (studio), WAV 32-bit float (Studio plan). True-peak limited at −1 dBTP.
How online mastering works — three steps, full control
No plugin to install. Works entirely in your browser.
Upload your mix
Drag and drop any WAV, FLAC, MP3, M4A, AIFF or OGG file up to 500MB. Audio processing happens in your browser — your file is decoded and processed on your own device, and never uploaded for mastering.
Choose your target & dial in your sound
Pick a loudness target and a genre starting point, then fine-tune every control in real time. A/B bypass lets you hear exactly what each move does.
Export, normalised and true-peak safe
Click Export. Quantara measures the integrated loudness (BS.1770), normalises toward your target, and applies a true-peak limiter at your ceiling (default −1 dBTP). Free accounts get 1 export with a watermark; Pro and above are unlimited.
Built for people who release music
One mastering chain, with the numbers in front of you.
Independent artists
Release-ready masters for Spotify, Apple Music and YouTube without booking a studio, with loudness and true peak measured rather than guessed.
Producers and mix engineers
Check a mix against each platform's loudness reference, compare at matched loudness and deliver true-peak-safe files.
Suno and Udio creators
Turn generations into masters that sit next to commercial releases: tame harsh highs, control the low end and hit each platform's reference.
Transparent mastering you can hear and measure
No invented numbers, no fake quotes. Judge it the way an engineer would — with your ears and real meters.
Hear every decision
Every control adjustable, with instant A/B bypass, so you can hear exactly what each change does to your track. Everything runs in your browser — your audio is never uploaded.
Measured, not guessed
Loudness is metered to the BS.1770 standard, peaks are read as true-peak, and gain reduction comes straight from the compressor and limiter — not estimated from a spectrum.
Honest by design
Exports normalise toward each platform's loudness reference and hold a true-peak-safe ceiling, instead of crushing everything to a loudness-war number. For high-stakes releases, it complements critical listening rather than replacing your ears.