There's no such thing as a truly free, permanent, legitimate AdGuard license. Using unauthorized keys violates their terms and risks security issues. Consider the free browser extension or wait for a sale if budget is tight.

(proceed with caution):

If you are a filter maintainer, userscript developer, or extension creator, you may qualify for a free license key as a thank-you for your contribution to the internet community.

If you don't need the full premium suite (which includes app-level blocking), AdGuard offers powerful free tools:

The safest and easiest way to experience AdGuard Premium is through their official trial.

: Contributing to the translation of the app into different languages. Software Developers

The safest and most reliable way to use AdGuard Premium for free is through their official trial.