Encrypted on your machine
AES-256-GCM with a key stretched from your passphrase using PBKDF2-SHA256 at 600,000 iterations. Done entirely by your browser's crypto engine.
Open & offline · nothing leaves your device
Back up your seed phrase. Trust no server.
Web3 Coin Vault encrypts your 12 or 24-word recovery phrase inside your own browser, then hands you an encrypted file. No account, no database, no company that can read your words — including us.
No network requests
AES-256 in-browser
You keep the file
256-bit
AES-GCM encryption
600,000
PBKDF2 iterations
0
Servers involved
0
Bytes sent anywhere
Why it's different
Your phrase never leaves this device
Most "wallet backup" pages are traps: they ask you to type your phrase, then quietly send it to whoever built the site. Web3 Coin Vault is built the opposite way — encryption happens locally, and a strict browser policy stops the page from making any outbound connection at all.
No servers, no logging
No IP addresses, no device fingerprints, no location, no admin dashboard. There's nothing on the other end because there is no other end.
Only you hold the key
Your passphrase never leaves your head. Without it the backup file is unreadable — even to someone who steals the file itself.
How it works
Three steps, all local
Enter your words
Type or paste your 12 or 24-word phrase into the numbered boxes. Paste fills every box at once.
Set a passphrase
Choose a long passphrase only you know. This is the single key that unlocks the backup later.
Download the file
The encrypted file saves to your device. Keep it and your passphrase apart — an offline drive is ideal.
Know the difference
Web3 Coin Vault vs. a phishing "backup" site
The design decisions are what separate a real self-custody tool from a trap. Here's exactly where they diverge.
Web3 Coin Vault
Phishing site
Where your phrase goes
Stays in your browser
Sent to their server
Who can read it
Only you
The site operator
Network requests
None, blocked by policy
Uploads on submit
Accounts & tracking
None
IP, device, location
Support
Please select an issue category
Which of these is related to your issue? We'll guide you to the right solution.
Swap / Exchange
We will support you in any related issues with swapping and/or exchange of coins.
NFT Mint
Turn your digital content into NFTs by uploading them here.
Connect to Dapps
Connect decentralized web applications to mobile wallets. Enable DAPP on mobile wallet / extension.
Login Issues
Having trouble logging into your wallet? We'll help you regain access.
Missing Funds
Lost access to funds or funds showing as missing? We'll help you locate them.
High Fees
Experiencing unexpectedly high transaction fees? Let us help you optimize.
Migrate
Need help migrating your assets from one wallet or chain to another?
Transaction Delay
Transactions taking longer than expected? We'll help you check the status.
Issues With Trading Wallet
Having problems with your trading account? We're here to assist.
Unable to Purchase Coins
If your account is not recognized as a trusted payment source, you may not be able to buy crypto. Follow the process to get started.
Locked Account
Logged out due to suspicious activity on your account? We'll help you unlock it.
Make an encrypted backup in under a minute
No sign-up. No upload. Just your phrase, your passphrase, and a file that's yours.