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What Is a Seed Phrase and How to Store It
What a seed phrase (recovery phrase) is, why anyone who sees it can take your crypto, and how to back it up safely offline, with the mistakes to avoid.
Key takeaways
- A seed phrase is the master key to a self-custody wallet: whoever has it controls the funds.
- Store it offline, on paper or metal, in a secure place; never photograph it, email it or save it in the cloud.
- No wallet, exchange or support agent will ever need your seed phrase. Anyone who asks is a scammer.
On this page
When you set up a self-custody crypto wallet, it shows you a list of 12 or 24 ordinary words and asks you to write them down. That list, the seed phrase (also called a recovery phrase), is the most important thing you will ever own in crypto. Lose it, and you may lose your coins. Share it, and you almost certainly will.
What a seed phrase is
A seed phrase is a human-readable version of the secret number that generates all the private keys in your wallet. Most wallets follow a standard called BIP-39, which uses a fixed list of 2,048 words. From those 12 or 24 words, the wallet can recreate every address and key it has ever made.
That’s what makes it powerful: if your phone breaks or your hardware wallet is lost, you can restore everything on a new device by typing in the phrase. It’s also what makes it dangerous. Anyone who has your seed phrase can do exactly the same, from anywhere in the world, and crypto transactions can’t be reversed.
Seed phrase vs password
| Password | Seed phrase | |
|---|---|---|
| Can be reset | Usually | Never |
| Who holds a copy | The service | Only you |
| If stolen | Change it | Move funds immediately to a new wallet |
| If lost | Account recovery | Funds may be lost forever |
If your crypto is held on an exchange, you don’t have a seed phrase; the exchange holds the keys. Our guide to exchanges vs wallets explains the difference.
How to store it safely
- Write it down by hand when the wallet shows it, in order, and check each word carefully.
- Keep it offline. No photos, screenshots, notes apps, emails, cloud drives or password managers that sync online.
- Consider a metal backup. Stamped or engraved steel plates survive fire and flood far better than paper.
- Store it somewhere secure, such as a home safe, and consider a second copy in a different secure location.
- Don’t label it “crypto seed phrase.” Discretion is part of security.
- Test your backup by restoring a wallet with a small amount before you rely on it.
- Plan for inheritance. Make sure a trusted person knows how to find your backup, and how to get help, without exposing the words themselves.
Common mistakes
- Typing it into a website to “connect” or “validate” a wallet
- Storing it on your phone, where malware or a cloud backup can expose it
- Splitting it into halves in different places: each half gives thieves a head start
- Making up your own words, which isn’t secure and won’t restore correctly
- Keeping one copy only, so a single fire or flood wipes you out
Extra protection for larger amounts
Some wallets support an optional passphrase, sometimes called a 25th word, which creates a separate hidden wallet. It adds protection if your seed phrase is found, but if you forget the passphrase, the funds are gone, so it suits experienced users. Multisignature wallets, which need several keys to move funds, are another option for large holdings. Pair any of these with a hardware wallet that keeps keys offline.
Frequently asked questions
What happens if someone sees my seed phrase?
Assume the wallet is compromised. Set up a new wallet with a new seed phrase and move your funds to it immediately.
Can I recover crypto without my seed phrase?
If you still have access to the wallet and its PIN, you can write down the phrase again or move funds to a new wallet. If you’ve lost both the device and the phrase, the funds are usually unrecoverable. Anyone offering to recover them for a fee is almost always running a scam.
Is a 24-word phrase safer than 12 words?
Both are extremely hard to guess. The bigger risk is how you store it, not how long it is.
Sources
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