Privacy

mp3bat is built so that your files never leave your device. This page explains what that means in practice — and, just as importantly, what we deliberately don't do.

Your files

When you convert a file, it is read and encoded entirely inside your browser using the Web Audio API and a WebAssembly MP3 encoder that runs on your own machine. The file's bytes are never uploaded, transmitted, or sent to mp3bat or any third party. There is no server-side processing step, because there is no server in the loop at all. When you close the tab, the file and the converted MP3 are gone from memory.

What we don't collect

• We don't require an account, so we hold no names, emails, or passwords.
• We don't receive your audio or the MP3 we help you create.
• We don't run pop-up, redirect, or interstitial ad networks on the tool.
• We don't sell data, because we don't collect the data to sell.

Fonts and assets

Fonts and code for the converter are served from mp3bat itself rather than third-party CDNs, so simply loading and using the converter doesn't hand your activity to another company.

Analytics

For aggregate traffic we use cookieless, privacy-first analytics (Plausible and Ahrefs Web Analytics). They set no cookies, write nothing to your device, collect no personal data, and never see the contents of your files (which we never receive in the first place) — only anonymous, aggregate measurements like page views and country-level location. That's also why mp3bat shows no cookie-consent banner: there are no tracking cookies to consent to.

Affiliate links

Some outbound links are affiliate links, which can earn us a commission at no extra cost to you. They don't affect this privacy promise. See the affiliate disclosure for details.

Changes

If this policy changes, the change will be reflected here. The core promise — your files are converted on your device and never uploaded — is foundational to the product and not something we intend to walk back.