Last updated: June 15, 2026
Guitar Tool Hub is built with open-source software, and we're grateful to the people who make it. This page lists the libraries that carry attribution or notice obligations. Other standard permissive dependencies (under licenses such as MIT, ISC, and Apache-2.0) are covered by their own license files within the code we distribute and are not individually re-listed here. A complete list of components and their notices is also available on request at alterego.011214@gmail.com.
The Pitch Changer tool processes audio entirely in your browser using the open-source libraries below. Both are used unmodified, as installed from npm.
soundtouchjs@breezystack/lamejsWAV export uses a small PCM encoder written in-house, with no third-party code. MP3 encoding is patent-free — the relevant MP3 patents expired in 2017.
This site includes @breezystack/lamejs, which is covered by the GNU Lesser General Public License, version 3.0 (which incorporates the terms of the GNU General Public License v3.0).
The library is included unmodified and is dynamically loaded as a separate, replaceable module. You are free to obtain the library's complete source code from its repository above and to use, study, modify, or substitute your own compatible version of it. If you would like the exact version we ship or a copy of the corresponding source, contact us at alterego.011214@gmail.com.
The library is provided by its authors with no warranty, to the extent permitted by applicable law. See the full license text for details.
The Pitch Changer only processes files you supply, and all decoding, pitch shifting, and exporting happen locally in your browser. No audio is uploaded to or stored on any server, and the tool does not download or extract audio from YouTube or any streaming service. Please only process audio you have the rights to use.
No sign-up. No download. Your files stay with you.