OptiFine
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In the next several hours some capes may not be visible due to server upgrade.

Change cape

Here you can change the design of your OptiFine cape, deactivate it or move it to another username.
This page can automatically correct upper/lowercase errors in the cape username.
If you do not have a cape, you can get one by donating.

Minecraft login (email)
Password

The username and password are used to verify that you own the account by logging on the Minecraft login server via a secure connection.