Legal

Your privacy

Last updated 29 October 2026

Who we are

Music Library Tools LTD ("we", "us", "our") operates the IntroEdits website and the IntroEdits desktop application. We are the data controller for the personal information described on this page.

This notice explains what we collect, why, and what you can do about it. It applies to the website, the application, and any emails we send you about them.

Your music stays yours

This is the part most people want answered first, so it comes first.

In the app, your audio files are never uploaded to us. IntroEdits reads the tracks you point it at on your own computer, separates the stems on your own computer, and writes the finished edit back to your own drive. The analysis, the separation and the rendering all happen locally. We never receive a copy of a track, a stem, or an edit.

The editor on this website works differently, and it has to. There is no way to separate a record in a browser, so if you make an edit here the track you drop in is sent to our server, separated, and sent back. That is the only reason it is ever transmitted.

It is deleted as soon as your edit is made. Each edit is processed in its own temporary space which is destroyed the moment the request finishes — within seconds, whether it succeeded or failed. We keep no copy of your track, no copy of the stems, and no copy of the edit. Nothing is retained to train anything, nothing is kept for later, and nothing from your upload is ever shown to another user.

If you would rather nothing left your machine at all, use the app. That is the difference between them, and it is a real one.

Your DJ library is never uploaded either. The app reads your Serato, Rekordbox or VirtualDJ library so it can show you your crates. It only ever reads them, it never writes to them, and the crate names, track lists and file paths it reads stay on your machine.

The only thing that leaves your computer is your account: who you are, whether you are on Pro, and a count of the edits you have saved — not what they were edits of. The one exception is a support report, which you choose to send. See below.

What we collect

Your account. Your email address, a securely hashed password, and the DJ name you choose when you sign up. The DJ name is also written into the edits you make — into the filename and the title tag — so it appears on your own files. If you answer the optional "Where did you hear about us?" question when you sign up, we keep that answer with your account, to tell which of our adverts and posts bring people to IntroEdits.
Your edit count. Because a free account can save three finished edits a month, we have to count them. We record that an edit was saved and when. We do not record its name, the name of the track, the audio, the source file, or where on your computer it came from. So that saving the same record again this month is free, the app sends a fingerprint worked out from the audio itself: it tells two saves of one record apart from two records, and it cannot be turned back into the audio or its name. Edits saved before 29 October 2026 also recorded the filename the edit was saved under. A count that the app worked out for itself would be a count the app could be persuaded to get wrong, so it is worked out by our database instead. The Mac app also sends a one-way scrambled (hashed) version of your computer's hardware ID with each edit, so the three free edits are counted per computer as well as per account. The ID itself never leaves your Mac, and the hashed version cannot be turned back into it. The web editor does the same with a random ID it keeps in your browser's local storage — not a fingerprint, and not linked to anything else about you — so the free edits are counted per browser as well as per account.
Support reports, only if you send one. When you report a problem from the app, the report carries the app's log of that session so we can see what went wrong. The log names the files you opened and saved, but not the folders they are in. The report screen shows you this before it is sent, and nothing is sent unless you send it.
Your subscription status. Whether you are on IntroEdits Pro and when it renews.
Payments. If you subscribe, Stripe handles your card details directly. We never see or store your card number. We keep a record of what you bought and when.
Basic app diagnostics. When you last signed in, and which version of the app you are running, so we can support you when something goes wrong.
Website analytics. Pages visited, approximate location from your IP address, device and browser — only if you have accepted analytics. See the cookies section.
Server logs. Every request to this website is recorded by our server: the page asked for, the time, whether it worked, the address you came from, your browser, and a shortened version of your IP address with the final part removed so it identifies a network rather than a household. This is how we tell that the site is up and find out when something is broken. Unlike the analytics below, it is not optional and does not depend on your cookie choice — it is the server writing down what it did. We keep it for no longer than 30 days.
Advertising measurement. When you create an account, ask us to email you the download link, make an edit, or start a subscription, our server tells Meta (Facebook and Instagram) that it happened, with your email address and account ID in hashed form, so we can tell whether our adverts lead to people using IntroEdits. Meta uses the hashed values only to match the event to an advert; it does not receive your password, your music or your edits.
How you found us. If you arrive through one of our own tracked links or adverts, we record which link it was, so we can tell which of our marketing is worth continuing. This is tied to your visit to our site, not to your browsing anywhere else.

Why we use it, and on what basis

To give you the product you asked for. Creating your account, signing you in, applying the free allowance or your Pro subscription, taking payment and providing support. Our basis is performance of a contract with you.

To keep the product working and fair. Diagnosing faults, keeping the website up, preventing abuse, and enforcing the free monthly allowance. Our basis is our legitimate interest in running the product and in the free tier meaning the same thing for everyone.

To tell you about our own products. See the next section.

To meet our legal obligations, such as keeping records of sales for tax purposes.

Marketing emails

If you sign up for IntroEdits, we may send you emails about IntroEdits and our other DJ software. We tell you this at the point we ask for your address, and every marketing email has a one-click unsubscribe link. Our basis is the soft opt-in permitted under the Privacy and Electronic Communications Regulations, or your consent where you have given it.

Unsubscribing from marketing does not stop the emails we have to send you about your account, your subscription, or a password reset.

We do not sell your email address, and we do not share it with anyone for their own marketing.

We use a small number of service providers who process personal information on our behalf, under contract and only on our instructions:

Supabase — stores your account, your DJ name, your subscription status and your edit count.
Stripe — takes payments and handles your card details directly.
DigitalOcean — hosts this website.
Better Stack — stores our server logs and tells us when the site goes down.
Sentry — records the technical detail of an error so we can fix it.
Google — Analytics, Tag Manager, Search Console and Ads, where you have accepted the relevant category.
Meta — advertising measurement, where you have accepted advertising cookies.
Click — our own link and visit tracker, self-hosted by us, not a third party.

Some of these providers are based outside the UK. Where information is transferred outside the UK, it is protected by the safeguards required under UK data protection law, such as the International Data Transfer Agreement or an adequacy decision.

We may also disclose information where we are legally required to, or to establish or defend legal claims.

Cookies and this website

Necessary technologies always run: one local-storage entry remembering your light or dark theme, and one remembering the cookie choice you made, so we stop asking. Neither is sent to us. If you use the web editor, two more keep you signed in and count your free edits per browser; those are sent to us, because that is what they are for.

Everything else runs only if you allow it. Analytics and advertising tags are held inert in the page and are not loaded at all until you grant the category they belong to. You can change your choice at any time from the cookie settings link in the footer.

With analytics allowed, we use Google Analytics to measure how the site is used, and our own self-hosted Click tracker to record page views against a first-party visitor id — so several page views can be recognised as one visit. If you arrived through one of our tracked links, we also keep that link's id, which tells us which post or video is worth continuing. It identifies the link, not you.

With advertising allowed, we measure whether an advert led to a download. Full detail of every technology, with what each one does, is in our cookies policy.

How long we keep it

We keep your account for as long as it is active. If you ask us to delete it, we will, other than records we are required to keep — sales records are kept for six years for tax purposes.

Edit records are kept while your account exists, because they are what the monthly allowance is counted from and the only record of what the app has made for you.

Server logs are kept for no longer than 30 days, then deleted. Error reports are kept for up to 90 days.

If you unsubscribe from marketing, we keep a record of that so we do not email you again by mistake.

Your rights

Under UK data protection law you have the right to ask us for a copy of the personal information we hold about you, to have it corrected if it is wrong, to have it deleted, to restrict or object to how we use it, and to receive it in a portable format. Where we rely on your consent, you can withdraw it at any time.

To exercise any of these, email us at the address below. We will respond within one month. We will not charge you, and we will not treat you differently for asking.

Deleting your account removes your email, DJ name and edit records. The edits themselves are unaffected, because they are files on your own drive and we never had them.

Contact and complaints

For anything about this notice or your personal information, email courtney@musiclibrarytools.co.uk.

If you are not happy with how we have handled it, you can complain to the Information Commissioner's Office at ico.org.uk, or by calling 0303 123 1113. We would rather you came to us first so we can put it right.