Online Audio Mastering — Professional Results in Seconds
Upload your mix and Engineer Guy's AI analyzes every frequency, applies mastering-grade limiting and EQ, and hands you a track that's loud, clear, and streaming-ready.
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AI-Powered Loudness
Targets -14 LUFS for Spotify and Apple Music automatically. No manual LUFS meters needed.
Frequency Analysis
See exactly what's happening in your low end, mids, and highs — and how the master fixed it.
Streaming Ready in 60s
Get a WAV master ready for Distrokid, TuneCore, or direct upload in under a minute.
Mix Feedback Included
Don't just get a master — understand what to fix in your mix before the next track.
What Is Online Audio Mastering?
Mastering is the final step before a track reaches listeners. It ensures consistent loudness, tonal balance, and compatibility across every speaker, headphone, and streaming platform. Traditionally this required booking a mastering engineer at $50–$300 per track. Today, AI tools like Engineer Guy do the same job in seconds — for free.
How Engineer Guy Masters Your Track
When you upload a mix, the AI runs a full spectral analysis across the entire track. It identifies problem frequencies — muddy low mids, harsh highs, a weak low end — then applies a transparent mastering chain: multiband compression, harmonic excitement, stereo widening, and a final limiter calibrated to streaming targets.
The result is a master that sits at the right loudness for Spotify, Apple Music, and YouTube without pumping, clipping, or losing the dynamics that make your track feel alive.
Why Not Use a Regular Plugin Chain?
Most producers spend hours tweaking a mastering chain and still second-guess the result. The problem is ear fatigue — after mixing a track for hours, your ears can't tell you what a listener hears on fresh ears. Engineer Guy listens with a fresh perspective every time and gives you specific feedback: "your 200Hz is 4dB hot and causing masking" is more useful than another limiter preset.
Who This Is For
Independent producers releasing on streaming platforms. Beatmakers selling beats online. Songwriters who want their demos to sound professional. Anyone who's been told their tracks sound "amateur" or "not radio-ready" and doesn't know why. You don't need to know anything about mastering — just upload the track.
Ready to hear the difference?
Upload your track and get AI feedback in under 60 seconds.
Frequently Asked Questions
Is online audio mastering as good as a real mastering engineer?
For most independent releases, AI mastering gets you 90% of the way there at zero cost. A human mastering engineer adds nuance and creative decisions that matter at the major-label level. For streaming releases, AI mastering is the practical choice.
What file format should I upload for mastering?
Upload a WAV or MP3 of your final mix — no limiting on the master bus. Leave 1–3dB of headroom. Engineer Guy accepts up to 300MB.
Will it sound good on every speaker?
The AI targets loudness and frequency balance standards used across the industry. It's tested against Spotify, Apple Music, and YouTube normalization. Won't guarantee every bluetooth speaker, but it'll translate.
How long does online mastering take?
Most tracks are analyzed and returned in under 60 seconds. Longer tracks (7+ minutes) may take up to 2 minutes.
Do I keep the rights to my music?
100%. Engineer Guy doesn't claim any rights to your audio. Your files are processed and stored only for your session.
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