LASTLVL Mastering Technology™

LASTLVL Guarantee Claim Portal

Structured, fair, performance-based guarantee.

This page is only for submitting a LASTLVL Guarantee Claim. You’ll upload your masters, confirm a few details, and we’ll review.

14+

Years mastering

200+

Artists worldwide

200M+

Streams mastered

Billboard

Chart placements

🎛️ If you’re here, we’re going to take your claim and this comparison seriously.

Start Your Guarantee Claim

Please skim the basics below so your claim is valid and easy to review.

Before You Submit

A claim is only eligible when all of the following are true:

You purchased a paid master for a single song from LASTLVL (not an EP or album package).
This is the first paid master of that specific song from LASTLVL.
You have a Preferred Master from another service (of the same mix) that you genuinely prefer.
You’re submitting this claim within 48 hours of receiving your LASTLVL master.

Full rules are explained in the LASTLVL Guarantee Terms & Conditions .

What to Upload

LASTLVL master — full-length, uncompressed 16-bit or 24-bit WAV.
Preferred Master — full-length, uncompressed 16-bit or 24-bit WAV from the same mix.
Files must be downloadable WAVs (no MP3, AAC, streaming-only links, or snippets).

What to Include in the Message

In the message/notes section of the upload portal, please:

Enter “LASTLVL GUARANTEE CLAIM” as the subject.
Include the song title.
Include the date you ordered the original master.
Briefly explain why you prefer the other master (tone, loudness, translation, etc.).

Please note: While we always aim for the best possible result, this is not a 100% satisfaction guarantee — it applies specifically to matching or beating another master of the same exact mix.

1 Upload Files

2 Confirm Claim

Upload Your Files for Review

Secure upload portal — please upload both the LASTLVL master and the Preferred Master as full-length WAV files.

We’ll compare both masters using gain-matched A/B listening. If your claim qualifies, we’ll create up to two alternate versions in an attempt to match or beat the Preferred Master.

Step 2 After your upload shows 100% complete above, confirm your claim details below:

I confirm my upload is complete and all files show 100% uploaded. I confirm the Preferred Master was created from the exact same mix submitted to LASTLVL and is a full-length WAV. I have read and agree to the LASTLVL Guarantee Terms & Conditions . Submit Guarantee Claim →

There is no payment on this page. This portal is only for Guarantee claim file submission and review.

You’ll receive confirmation and next steps after we’ve reviewed your files.

Questions About the Guarantee?

Reach out via Instagram: @lastlvlmastering
or email: [email protected]