When you are trying to restore your account on Polkadot-JS UI or in the Polkadot extension, you may get an error like in these screenshots.

Polkadot-JS UI:

Polkadot extension:

If your mnemonic phrase appears to be invalid, please check the following:

  • That all the words are entered. The error message will show up until you fill out the whole mnemonic phrase correctly. Usually, a mnemonic phrase consists of 12 or 24 words.

  • All the words are spelled correctly. You can check them against this list to ensure they are spelled properly.

  • You enter the words in small letters only.

  • You use only one space between the words and no space or new line at the end or beginning.

  • Your keyboard is set to English.