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MasteringBOX Review

Published · updated · by Loopin

MasteringBOX is a friendly, generous online masterer: its free tier gives you unlimited masters, which is rare. The catch is format — the free output is MP3/M4a only, so a real WAV needs a paid plan. This review covers where MasteringBOX shines, where the free-WAV gap bites, and a free in-browser tool that hands you a WAV with no signup.

MasteringBOX at a glance

MasteringBOX is a straightforward online mastering tool with an unusually generous free tier — you can master as many tracks as you like without paying. That’s a genuine plus.

The honest scorecard, with the format catch front and center:

What MasteringBOX does well

Credit where it’s due: an unlimited free tier is genuinely generous. Most free masterers cap you at a track or two, or gate the download entirely, so being able to run as many masters as you like without paying is a real advantage.

That makes MasteringBOX great for iteration. If you’re sketching ideas, comparing rough masters, or need a quick louder version to send to a collaborator, you can churn through versions without watching a counter.

For anything where an MP3 or M4a is the final destination — a quick share link, a social clip, a reference bounce, a YouTube upload — the free tier is a perfectly good option and you never touch your wallet.

The wedge: no free WAV

The gap is format. MasteringBOX’s free tier only exports MP3/M4a — both lossy. For a demo link that’s fine, but distributors and most streaming platforms want a lossless WAV, and re-encoding a lossy file for release is a compromise you don’t want to make. Once data is thrown away in an MP3 encode, converting back to WAV can’t recover it — you just wrap the same lossy audio in a bigger container.

To get WAV/HD masters you move to a paid plan. That’s the wedge: the free tier is unlimited, but not in the format you actually release in. If your release pipeline needs lossless, the “unlimited” free tier quietly stops being free.

If a free WAV is what you’re after, Loopin’s free mastering exports a full-quality 16-bit WAV with dither, with no plan and no account.

MasteringBOX pricing

Here’s how the paid plans unlock WAV and more:

Is MasteringBOX worth it? Who it’s for

MasteringBOX is worth it if MP3/M4a is genuinely your endpoint, or if you master occasionally and PRO’s three WAVs a month cover your releases. The unlimited free tier is hard to beat for reference bounces.

It’s less compelling if you need free WAVs, or more WAVs than the PRO cap without stepping up to the EUR 19/month Unlimited plan.

MP3 vs WAV: when the free tier is enough

The whole MasteringBOX decision hinges on one question: is your master’s final destination lossy or lossless? Get that right and you’ll know instantly whether the free tier covers you.

Here’s a quick way to decide before you spend anything. If any of the WAV rows describe you, the free tier isn’t your endpoint — and paying isn’t the only way to get a lossless master:

The free-WAV alternative

If the missing free WAV is the blocker, you can get one for nothing without an account. Loopin’s free mastering runs a real chain — corrective EQ, multiband compression with the bass band kept independent and mono, character EQ, saturation, mid/side stereo with the low end mono, two-pass loudness targeting to about −14 LUFS, and a true-peak limiter at −1 dBTP — all in your browser, and it exports a full-quality WAV.

Because it’s client-side, nothing is uploaded either.

  1. Bounce your mix as a WAV with headroom (peaks near −6 dB, no mix-bus limiter).
  2. Open Loopin Mastering and drop the file in — no signup.
  3. Pick a feel and A/B Original vs Mastered to check the balance.
  4. Download the mastered WAV — free, unlimited, unwatermarked.

The verdict

MasteringBOX is a solid, generous free option — unlimited masters is a real perk, and if MP3/M4a is your endpoint you may never need to pay. The paid tiers are reasonably priced too, so if you like the tool and want its WAV output and EQ control, PRO at EUR 9/month isn’t a bad deal for a few releases a month.

But the moment you need a lossless WAV to release — and you don’t want a per-month WAV cap or another subscription — the free tier stops short and a paid plan kicks in. If a free WAV is the whole point, a free in-browser tool gives you one with no signup and nothing uploaded, then MasteringBOX’s paid tiers are there if you ever want its extras.

Frequently asked questions

Is MasteringBOX free?

Yes — MasteringBOX offers unlimited free masters, but only in MP3/M4a. A lossless WAV requires a paid plan. If you want a free WAV, an in-browser tool like Loopin exports a full-quality WAV with no signup.

Can I get a free WAV from MasteringBOX?

No. The free tier is MP3/M4a only. WAV/HD masters start on the PRO plan at EUR 9/month (EUR 7/mo billed annually) for 3 WAV masters per month, or EUR 19/month for unlimited formats.

How much is MasteringBOX PRO?

PRO is EUR 9/month, or EUR 7/month billed annually, and includes 3 WAV/HD masters per month plus EQ control. The Unlimited plan is EUR 19/month for unlimited masters in all formats.

Is MasteringBOX worth it?

It’s worth it if MP3/M4a is your final format or PRO’s 3 WAVs a month cover your releases. If you need free lossless WAVs, a free in-browser alternative like Loopin fits better.

Is an MP3 master good enough to release?

For share links, social clips and references, yes. But distributors and streaming platforms want a lossless WAV, and re-encoding a lossy master for release is a compromise — better to master to WAV in the first place.

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