XMR Seed Helper
Validate Monero seed phrases and recover missing words
⚠ Security Notice
- Never enter a seed phrase holding real funds into an online tool. Download the offline version and use it air-gapped.
- Cake Wallet and some other wallets offer an optional passphrase on top of the seed. This passphrase is NOT part of the 25-word mnemonic - do not enter it here.
- Memorable phrases are vulnerable to social engineering and dictionary attacks. If you use one, always protect the wallet with a passphrase.
Monero seed structure
- 24 words encode a 256-bit private key. Word 25 is a CRC32 checksum - always computed, never chosen freely.
- Words are grouped into 8 triplets (1-3, 4-6, ... 22-24). Each triplet encodes a 32-bit number together.
- Not every combination is valid: 1626³ slightly exceeds 2³², so ~0.09% of triplets are out of range. Invalid triplets are highlighted in amber.
- If a triplet is invalid, change its third word - the third word has the most degrees of freedom.
- Never enter a real seed on an online-connected device. Use the offline file.
This tool is for emergencies only - memorizing a seed for a border crossing, or recovering an incomplete paper seed. Hardware wallets are your friend. Always.
