Missing a Word in Your Seed Phrase? How to Find It
Lost one or two words of your BIP39 recovery phrase? Here's why a missing word is usually recoverable, and how to find it safely in your browser.
A single missing word feels catastrophic in the moment. It usually isn't. Because a BIP39 phrase carries a checksum, the number of words that can validly fill a blank is small — and if you know one of your wallet's addresses, it collapses to exactly one.
Do this on the Seed Phrase Recovery homepage. It runs entirely in your browser; your words never leave the page.
Why a missing word is recoverable
The BIP39 wordlist has 2048 words. Naively, a blank could be any of them. But the last bits of a seed phrase are a checksum computed from all the other words, so most candidates fail immediately:
- In a 12-word phrase, only 128 of the 2048 words make the checksum valid.
- In a 24-word phrase, only 8 do.
That's already a short list to try by hand. Add a known address and the tool picks the single correct phrase for you.
How to find the missing word
- Open the recovery tool and select your phrase length.
- Type every word you know in its correct position. Leave the missing slot blank.
- (Recommended) Paste a receive address from the wallet. The tool detects whether it's Bitcoin or Ethereum and checks the first receive addresses.
- Run it. With an address, you'll get one confirmed match. Without one, you'll get the short list of checksum-valid phrases to try in your wallet.
If the word you're unsure about is written down but might be misspelled, see the checksum-error guide and enable fuzzy matching.
Two missing words
Two blanks is still very doable. The combination count rises to a few million, but the checksum throws out most of them, and address-matching confirms the rest. The tool shows a progress bar and stops as soon as it finds your wallet. Three or more unknown words is where things get hard without extra clues — start from the main recovery guide if that's you.
Stay safe
- Never type your phrase into a tool that sends it to a server, and never share it with "support" or a paid recovery service — those are scams.
- Prefer an offline device. Our tool works with no network connection.
- After recovering on an online machine, move your funds to a new wallet.
A blank slot is a math problem, not a dead end. Fill in what you know and let the checksum find the rest.