Mastering is the final step of audio post-production. The purpose of mastering is to balance sonic elements of a stereo mix and optimize playback across all systems and media formats. Traditionally, mastering is done using tools like equalization, compression, limiting and stereo enhancement. It is the final set of tweaks before music is released. Click here to find out more.

Mastering can make your tracks or podcasts sparkle - more like the songs you hear on the radio. It is usually done as part of post production. Most people will hire a mastering engineer even if they record in a nice studio. Maztr makes this service instant and affordable.

Sure does :) Sign up for a free account and try it out for yourself.

Now let's be clear, we're not trying to put traditional mastering engineers out of business. We don't claim to be better than having an actual human with years of training analyze each second of your track, but we're perceivably close.

Think of us like auto-focus on digital cameras, but for music instead of photographs. The auto focus doesn't make someone a professional photographer, but they sure can take a lot better pictures with it!

Sure! Just sign up for a free account, master some of your tracks and upgrade when you're ready.

Nope! You can change or cancel your Plan at any time. No contracts, no commitments.

Nope! You only need a credit card if you'd like to upgrade to a paid plan or upgrade a track to download a 24-bit WAV. There's no credit card needed to use the Free Plan to master MP3s.

We offer 4 types of plans - Free, MP3, Pro and Pro Plus - each with different features.

Each paid plan also offers monthly and yearly payment options.

Sure can! You can change your Plan or downgrade to a free account at any time by clicking on the "Plan" option in your account.

Please note, if you downgrade, we do not offer refunds on payments already made. Also, to keep our costs low, all masters from your paid account will be deleted.

Yes, sign up for a free account and master a low-res 192kbps MP3 for FREE.

If you want to master a high-res 320kbps MP3 or a 24-bit HD WAV, there are 2 options to master a single track:

1. If you already have a free account, click the "Upgrade Track" button in your Project to get all the Pro Plus features for your chosen track.
2. If you don't have an account, click here to jump straight in and master a Hi-Res track. This option allows you to master a track up to 300MB in size with all the Pro Plus features.

Both options cost a one-time $4.99 fee to master that one track.

Yes, Pro and Pro Plus accounts can master unlimited 16-bit WAVs as well as 24-bit HD WAVs and high-res 320kbps MP3s. Upgraded tracks also have these options.

Our intelligent algorithms will make your tracks sparkle, but unlike some services, you have full control.

Free accounts can master unlimited low-res 192kbps MP3s for FREE. If you want to master a high-res 320kbps MP3 or a 24-bit HD WAV, you can pay a one-time $4.99 to master that single track.

Pro and Pro Plus accounts can master unlimited high-res 320kbps MP3s or 16-bit and 24-bit HD WAVs. MP3 accounts can master unlimited high-res 320kbps MP3s.

All of our accounts come with the ability to master an unlimited number of tracks.

Free accounts can store up to 2 tracks, MP3 accounts can store up to 3 tracks, Pro accounts can store up to 5 tracks, and Pro Plus accounts have unlimited storage. If you don't want to upgrade, you can always delete older tracks to free up more storage for newer ones.

Free accounts have a maximum file size of 50MB, MP3 accounts have a maximum of 150MB, Pro accounts have a maximum of 300MB, and Pro Plus accounts have a maximum of 5000MB.

Your tracks will be stored as long as your account is active. If you downgrade to a free account or your subscription is cancelled, all masters from your paid account will be deleted to keep our costs low.

Yes, click here to see the current offers.

Free Accounts don't require any payment method!

If you want to upgrade your track or account to get more features, we accept Visa, Mastercard, American Express, Paypal and Bank Wire Transfers. Contact our Customer Service Team if you need more information.

We recommend uploading WAV files for best results. WAV files are lossless so they maintain the full audio quality of the original source material. As a result, they have become the defacto standard for Mastering.

We also support MP3 files for those who don't need such high quality, for example songs you play in the car.

Click here to use our free online Audio File Converter. This tool allows you to convert most major file formats, ready for mastering. These include WAV, MP3, AAC, AIFF, AU, FLAC, M4A, OGG, RAW and .WMA.

Some of our other audio tools such as the Audio File Cleaner can also convert file formats during processing.

Sure can! Many of our customers use Maztr to refresh their old music tracks from decades past and make them sparkle. In particular, MP3 tracks ripped from old CDs can get a new lease of life when you run them through Maztr's intelligent algorithms. Our MP3 Accounts are perfect for this purpose.

You can! You can do anything you'd like with the masters you make with Maztr. We only charge you for your membership and retain no rights to your tracks.

Not at all. We'd love it if you did :) , but no one has to know you used Maztr.

Yes, Pro Plus Accounts can have their own public web page and playlist for every track and project. You can also upgrade a single track to access its own public web page.

To set this up, just enable web pages in your track settings. Click here to find out more or click here to see examples.

Quick Start
This is the simplest workflow to get started quickly using basic automatic settings:
Click here to start This will open your Mastering Projects in a new window. Then, switch to the new window and follow these steps:

Need More Detail?
Click here for more detailed instructions.

On a computer or laptop, you can download a mastered track by right-clicking on the MP3 or WAV button, then select the "Save Link As…" option.

If you have a Mac with a 1 button mouse, Control-Click the MP3 or WAV button and select "Download Linked File". Also, you can hold down the option key when clicking the button to download your mastered track.

The process is a little different on mobile devices. In Chrome, long press the relevant button then select "Download Link". In Firefox, open the relevant file in Firefox's player, long press on the player then select "Save Audio".

When you upload a track for mastering, our system processes it using the settings you have chosen at that time. If you want to change those settings, you need to remaster your track to apply the new settings.

If you have a free account and don’t have remaster access, you need to upload your track again with the new settings to apply the changes. Alternatively, you can upgrade that single track or upgrade your account to get remaster access.

Click here to visit our Free Audio Resources section. We have lots of tools including audio file converters, editors, viewers and visualizers. All paid Maztr accounts have full, unlimited access, while free users have some size and access limits.

You must be logged into a paid account to get full, unrestricted access to all of our Audio Resources. Free users can still use these tools, but some size and access limits apply. Click here if you want to upgrade.

While our tools and resources have been designed to work on most devices, we recommend desktop and laptop computers to get the best results when using our services. Some other devices such as smartphones and tablets may have insufficient memory or less capable browsers which may cause problems during some mastering and file editing processes. For example, if your smartphone "hangs" during processing, it may not have enough memory and we'd recommend switching to a more powerful device.

Advertising supports our Free and Lower Tier services and helps to keep our prices low. However, users who sign up for a Pro Plus Account are ad free. Click here if you want to upgrade.

Although you can change your Plan or downgrade to a Free Account at any time, we do not offer refunds on payments already made.

If you need to change your credit card, simply click here to update your billing details. If you want to switch to payment with Paypal or bank wire transfer, click here to contact us.

Our Billing Provider will try to process the payment a total of 3 times before your Monthly Subscription is cancelled and all masters are deleted from your account.

If you need to change your credit card, simply click here to update your billing details.

You can cancel ongoing payments at any time by downgrading to a Free Account. Please note, downgrades are processed immediately and we do not offer refunds on payments already made, therefore we recommend waiting until near the end of your current monthly or yearly billing cycle before downgrading.

Also, to keep our costs low, all masters from your paid account will be deleted immediately, however you can upload new tracks and continue using your account on the Free Plan.

For security reasons, we can't accept downgrades by email. You'll need to click here to downgrade to a Free Account.

Sure can. You can upgrade and downgrade whenever you like, as often as you like.

However please note if you downgrade, we do not offer refunds on payments already made and all masters from your paid account will be deleted immediately to keep our costs low.

Sorry no. To keep our costs low, all masters are deleted from your account when you downgrade. You will need to upload your tracks and master them again.

You'll need to upgrade to a Pro Account. Hi-Res Single Track Accounts only allow you to master one Hi-Res track.

Our systems generally work better with devices such as tablets, laptop and desktop computers. Larger screens give more space to perform complex functions and view detail. Also, some smartphones and other mobile devices may have insufficient memory or less capable browsers.

Google's Chrome or Apple's Safari browsers generally give the best user experience on our site. A few browsers such as Firefox have issues and problems in some situations. Hopefully this will improve with future versions.

Please ensure you have updated your browser to the latest version. Some of our tools and resources use cutting-edge features which may not work in older browsers.

Unfortunately, it can be difficult to diagnose these problems because there are so many possible causes. Here's a checklist of suggestions that may help:

• Special characters in filenames such as ( ) # $ % often cause problems. Possible solution – rename files to remove these characters before uploading them.
• There may have been a connection problem when you were trying to upload a file. Possible solution – try again during a non-peak period.
• There may be an issue with your web browser settings or device compatibility. Possible solution – try a different browser or device. Our systems generally work better with non-mobile devices. Some smartphones and tablets may have insufficient memory or less capable browsers.
• If you have a firewall, it may be interfering with the process. Possible solution – turn off the firewall temporarily.
• The resource may not have been able to read the data in your files or they're not in compatible format. This may be temporary, so please try again.

If you continue to have problems, please contact us and we’ll try to guide you through other possible solutions. For example, paid users can send us files directly so we can process them manually and diagnose the problem first hand.

You must be logged into your account to get full, unrestricted access to all of our Audio Resources. Please make sure you have cookies enabled in your browser to access all the features. If your browser clears the cookies, you’ll need to log in again here.

If you recently upgraded from a Free Account to a paid account, please log out to reset your cookies, then log in again here.