A browser-based audio converter and tag editor that runs entirely on your device — no uploads, no server-side audio processing.
How it works
Audio is decoded and re-encoded in your browser using ffmpeg.wasm. Metadata is fetched from the Discogs database through a minimal Cloudflare Worker proxy, then written into your output files alongside the selected artwork.
Technology
Built on ffmpeg.wasm 0.11, LAME 3.100, libvorbis, FLAC. UI is plain HTML/CSS/JS — no framework.
Credits
Designed and built by R. Schutrups. Web companion to the Mac-app Minnt (formerly Mint Tag & Convert). Discogs database © Discogs Inc.
Originality statement
This application was written independently by R. Schutrups. All conversion logic uses publicly available open-source libraries (ffmpeg.wasm, LAME, libvorbis, FLAC) in full compliance with their respective licenses. No third-party code was copied or reverse-engineered.
LAME MP3 encoder — LGPL-2.1
MP3 encoding is provided by LAME, Copyright © 1998-2017 LAME Developers. LAME is licensed under the GNU Lesser General Public License, version 2.1 (LGPL-2.1). LAME is used solely to comply with the MP3 file-format specification; the LAME project makes no warranty about the legality of encoding MP3 in any particular country. Patents on MP3 encoding expired worldwide by 2017.
In accordance with LGPL-2.1 Sections 6(a)-(b), this application dynamically loads LAME inside the ffmpeg.wasm sandbox, allowing users to substitute their own LAME build if desired. Complete corresponding source for the unmodified LAME library is available at lame.sourceforge.io and mirrored at sourceforge.net/projects/lame/files/lame. A copy of the LGPL-2.1 license is distributed with ffmpeg.wasm (see the ffmpeg.wasm LICENSE file) and at gnu.org.
FFmpeg — LGPL-2.1
Audio decoding, muxing, and container I/O are provided by FFmpeg, Copyright © 2000-2025 FFmpeg developers. The bundled ffmpeg-core.wasm is built from unmodified FFmpeg sources under LGPL-2.1 (no GPL-only codecs are linked). The ffmpeg.wasm JavaScript wrapper (github.com/ffmpegwasm/ffmpeg.wasm) is MIT-licensed. Complete FFmpeg source is available at ffmpeg.org/download.html.
libvorbis & FLAC
Ogg Vorbis encoding is Copyright © Xiph.Org Foundation, BSD-licensed. FLAC encoding is Copyright © Josh Coalson & Xiph.Org, dual-licensed BSD (library) / GPL-2.0 (command-line). Sources: xiph.org/vorbis, xiph.org/flac.
jsmediatags — MIT
Embedded-tag reading is provided by jsmediatags, MIT-licensed, Copyright © Anderson Luis de Oliveira.
Discogs — API Terms & Data
Release metadata, tracklists, catalogue numbers, and cover-art references are queried from the Discogs database. Use of the Discogs API is governed by the Discogs API Terms of Use and the Discogs Terms of Service.
The underlying Discogs metadata (artist names, release titles, track listings, label info, catalogue numbers) is dedicated to the public domain under CC0 1.0 Universal, as declared in the Discogs Data policy. Cover-art images, however, remain the copyright of their original rights holders (record labels, photographers, designers) and are surfaced via Discogs for reference only.
All requests identify themselves with a User-Agent: Minnt/1.0 +https://minnt.app header and honour Discogs' rate limits (60 req/min anonymous shared pool, 60 req/min dedicated when signed in via Personal Access Token). This application is a client-side tagging utility — it does not re-host Discogs data, does not ingest the full Discogs dump, and does not compete with Discogs as a catalogue service.
Embedded artwork & fair use
Cover artwork embedded into output files is intended strictly for private tagging of audio files the user already legally owns. Redistributing copyrighted artwork outside of fair-use contexts (personal backup, private listening, scholarship, criticism, parody) is the user's responsibility. This application does not grant any license to the artwork itself — those rights remain with the original copyright holders. If a rights holder wishes to request removal of a specific cover image from Discogs, they should contact Discogs directly.
Google AdSense & third-party services
For non-Premium users, this application displays advertisements provided by Google AdSense (publisher ID ca-pub-7348958357969738). AdSense may set cookies and use third-party vendors to personalise ads; usage is subject to the Google Ads privacy policy. EU/UK/Swiss users receive a consent dialog via Google's certified CMP. Premium users see no AdSense script — the tag is not loaded at all. Users can also disable ads for testing via Settings → General → Show ads.
Discogs OAuth sign-in flow is proxied through a minimal Cloudflare Worker at discogs.minnt.app. No other third-party trackers or analytics are embedded.
Privacy Policy
Client-side first. Audio files are NOT uploaded anywhere. All decoding, re-encoding, and tag writing happens entirely inside your browser via ffmpeg.wasm. Your files never leave your device.
Local storage. The following is stored in your browser's localStorage only (never transmitted): user settings, Word Manager preferences, hotkey bindings, Discogs Personal Access Token (if you provide one), Premium license flag, and dark/light theme preference. You can wipe all of this via Settings → ↺ Reset to factory settings, or by clearing site data in your browser.
Network requests. The app makes HTTPS calls to: (1) discogs.minnt.app (Cloudflare Worker proxy) for Discogs metadata and cover-art URLs, (2) minnt.app/proxy.php to same-origin-wrap cover-art images so the COEP-isolated page can render them, (3) pagead2.googlesyndication.com for AdSense (non-Premium, opt-in only), and (4) cloud86-host.io CDN-style static assets. Standard HTTP access logs (IP, user-agent, timestamp, path) are retained by cloud86 for a rolling 30-day window.
Cookies. First-party cookies: none. Third-party cookies: only those set by AdSense for logged-in Google users (and only with consent in regulated regions).
GDPR & data requests. Because we store nothing server-side under your identity, most GDPR requests (access, deletion, rectification) are self-service: wipe localStorage or uninstall the site. For AdSense-related data, contact Google directly via their GDPR form. For questions about this application specifically, contact djisaac1 [at] gmail [dot] com.
Terms of Service
By using this application you agree that: (1) you own, license, or have legal permission to tag and convert the audio files you import; (2) you will not use the application to process or redistribute material in a way that violates copyright, moral rights, or applicable law; (3) the Premium subscription (if purchased) is handled by Stripe per their terms and is not refundable beyond the standard EU 14-day withdrawal right; (4) you will not attempt to reverse-engineer Premium gating, fingerprint other users, or abuse the Discogs API beyond its published rate limits.
No warranty — disclaimer
THIS APPLICATION IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, AND NON-INFRINGEMENT. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY CLAIM, DAMAGES, OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT, OR OTHERWISE, ARISING FROM, OUT OF, OR IN CONNECTION WITH THE APPLICATION OR THE USE OR OTHER DEALINGS IN THE APPLICATION.
Source-code availability (LGPL compliance)
Per LGPL-2.1 Section 6, the complete corresponding source code for LAME, FFmpeg, libvorbis, and FLAC — the LGPL/BSD components linked into this application — is freely available at the upstream URLs linked above. A written offer valid for three years is available by emailing djisaac1 [at] gmail [dot] com; the author will post a copy of the unmodified upstream source at the requester's choice of either a public URL or a mailed USB stick at material cost.
