# From mouse movements

There are many tools, working through the Firefox browser, allowing the user to obtain printable paper wallets generating using the movements of the mouse as a source of entropy. Even if these tools are working in a web browser, they are written in javascript and are executed completely locally.

When these tools are started, they collect the movements of the mouse.

<figure><img src="/files/Lm2d2BmoIDLapmRjxLcc" alt=""><figcaption><p>The entropy collecting phase</p></figcaption></figure>

Then, when they have enough entropy, they provide a printable paper wallet.

<figure><img src="/files/OqJsBJa0eKkrmeP1CgMf" alt=""><figcaption><p>The printable paper wallet, with keys and QR codes</p></figcaption></figure>


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