Privacy Policy

Last updated: July 19, 2026

MidiGlow is a free, browser-based MIDI player and visualizer. This page explains — in plain language — exactly what happens to your files and your data when you use it. The short version: your files never leave your device, and we collect nothing about you.

Your files never leave your device

When you open a .mid or .midi file, your browser's File API reads it straight into the page, where it is parsed, synthesized, and drawn locally. MidiGlow never uses form uploads, fetch/XMLHttpRequest, or any third-party upload SDK to transmit your files — there is no server anywhere in the product able to receive them. The only network requests the tool makes are for its own static assets (the page itself and the optional demo file hosted on the same domain). Once the page has loaded, the core tool even works offline.

No accounts, no personal data

MidiGlow has no signup, no login, and no user profiles, so there is no personal information to give us. The site does not set tracking cookies, does not run advertising, and does not use third-party analytics.

Nothing is stored

MidiGlow has no database and no server-side storage. Your browser keeps nothing either — no cookies, no local storage: the loaded file, playback position, track mix, and theme choice live only in the tab's memory. Refresh or close the tab and the session vanishes completely.

Error handling

If something goes wrong while parsing a file, the error message you see is generated locally in your browser. MidiGlow's error handling never includes file contents, MIDI event details, or local file paths beyond the name of the file you chose to open.

Changes & contact

If this policy ever changes, the update will be published on this page. Questions? Reach us via the contact page.