A recovery seed is supposed to be the backup of last resort. When it is missing words, has handwriting errors, is in the wrong order, or needs a passphrase you no longer remember, the wallet may still be recoverable if enough structure remains.
The important part is to stop trying random online tools and preserve exactly what you have.
Situations we evaluate
Missing words. BIP-39 seed phrases have a fixed wordlist and checksum. Depending on how many words are missing and what else is known, there may be a finite search worth attempting.
Misspelled or illegible words. Handwritten seed backups often contain words that look similar or were copied from memory. Similar-looking words, partial letters, and word positions can all narrow the search.
Words in the wrong order. If all or most words are present but the order is uncertain, the recovery problem is different from pure guessing. Preserve the original note and any clues about line breaks or grouping.
Unknown passphrase. Many hardware wallets support an optional passphrase on top of the seed. If the seed is valid but opens an empty wallet, a forgotten passphrase may be the missing piece.
Wrong wallet type or derivation path. A seed can be valid while restoring to the wrong address set. This is common when moving between wallet apps, hardware wallets, and older formats.
What not to do
Never type your seed phrase into a website that promises instant recovery. Never send it to someone who contacted you first. Never pay an upfront "software fee" to release recovered funds.
For the first evaluation, describe the situation without sending the complete seed. We will tell you what material is needed only after there is a real case, a written agreement, and a secure transfer path.
Related reading
For hardware-wallet loss patterns, read How hardware wallet users lose their Bitcoin. For Trezor-specific Shamir and passphrase context, see the Trezor recovery and repair page.