Check that a BIP39 recovery phrase has a valid word count before you try to import it into a wallet, without ever revealing the phrase to a server. The BIP39 standard only allows mnemonics of twelve, fifteen, eighteen, twenty one or twenty four words, corresponding to different entropy strengths, so a phrase with any other count is definitely wrong. Paste your words and the tool counts them, ignores extra spaces and line breaks, flags any obvious duplicates, and tells you whether the length is one of the valid options. It does not validate the checksum or the wordlist, and it deliberately does everything locally in your browser so your secret words are never transmitted. Use it as a quick first sanity check when a phrase was written down by hand, split across lines, or copied with stray whitespace before a restore.
A valid recovery phrase has 12, 15, 18, 21 or 24 words. Any other count means the phrase is incomplete or has extra words.
It focuses on counting the words in your phrase to confirm the length is one of the valid options before you attempt an import.
BIP39 phrases only come in specific lengths tied to entropy size. A wrong count means the phrase cannot restore a wallet.
Check that a BIP39 recovery phrase has a valid word count before you try to import it into a wallet, without ever revealing the phrase to a server. The BIP39 standard only allows mnemonics of twelve, fifteen, eighteen, twenty one or twenty four words, corresponding to different entropy strengths, so a phrase with any other count is definitely wrong.
Yes. BIP39 Seed Phrase Word Count Checker is completely free, with no sign-up and no usage limits.
Yes. BIP39 Seed Phrase Word Count Checker runs in any modern web browser. There is nothing to download or install.
Yes. BIP39 Seed Phrase Word Count Checker runs entirely on your device in your browser, so nothing you enter is uploaded to a server.