Altered Decklist Retrieva

This extension allows users to easily extract their decklists from Altered.gg directly from their personal deck page.

It securely retrieves the current session token to access all decks data, then compiles and exports it into a structured JSON file. This file can be used with external tools to import and manage decks outside Altered's website.

If the button is not showing up, refresh the page, then Click the "EXTRACT" button. If you authorized access to clipboard, the result is directly stored, otherwise a pop-up will be displayed.

As Altered.gg is scheduled to shut down by the end of May 2026, this extension is designed to help users back up and preserve their deck data before the service becomes unavailable.

Everything is done locally and stays within your browser for security reason.
WARNING: This extension uses sensitive data. Do not use it if you do not trust the source. I disclaim all responsibility for any issues or misuse that may arise from using this extension.

You can review the source code here : https://github.com/noobiwow/Altered-Decklist-Retrieval-Tool