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Electrum Seed Phrases: Formats and BIP-39
In short
Electrum-generated seeds and BIP-39 recovery phrases can use the same words without being interchangeable. Successful restoration depends on the original seed format and wallet settings, not just whether an app accepts the words.
- Distinguish an older Electrum seed, a versioned seed created from Electrum 2.0 onward, and a BIP-39 phrase imported from another wallet.
- A seed extension is separate from the password protecting the wallet file. Restoring with a new file password does not replace a missing extension.
- Compare a known receiving address before investigating a zero balance. Check the wallet type and, for imported BIP-39 phrases, the address type and derivation path. Never test real recovery words on a website.
An Electrum seed is not automatically a BIP-39 recovery phrase. Similar-looking words do not establish compatibility: the software must interpret the phrase using the right scheme.
Establish where the words were created
Start with the application that originally generated the phrase, not just the wallet in which you last used it. A phrase created by another wallet and later imported into Electrum remains a phrase in that original format.
An old installation, the wallet file and notes about the device or software version can help establish this history. A known public receiving address gives you something to compare after restoration without exposing the phrase.
Identify the format before restoring
- Electrum before version 2.0: an older encoding with its own fixed word list.
- Electrum 2.0 and later: a versioned seed. A hash identifies the seed type and how keys should be derived.
- BIP-39 imported into Electrum: a separate standard, not the format Electrum generates for its own new wallets.
Modern Electrum uses the English BIP-39 word list, but its validation and derivation are different. A BIP-39 checker rejecting an Electrum seed does not prove the seed is wrong. Never paste a real phrase into an online checker.
Match the original wallet settings
If a seed extension was used, the same extension is required. It is distinct from the password that encrypts the local wallet file. Two-factor wallets also need the appropriate wallet type during restoration.
When restoring from the complete seed information, you can set a new password for the new wallet file. That does not replace an unknown seed extension: changing the extension changes the keys derived from the seed.
If the restored wallet looks empty, compare a known receiving address before changing anything. Check the seed format, extension and wallet type first. For an imported BIP-39 wallet, the original address type and derivation path also matter. Keep the original wallet file while investigating.
If the expected addresses match but transactions are missing, check synchronization before trying a different phrase. Address discovery may also matter when unused addresses separate the addresses you used; this is the gap-limit issue. Follow Electrum’s documentation rather than running unfamiliar console commands or repeatedly modifying the original file.
The Electrum recovery guide covers file and password problems. For a TrustedCoin wallet, use the separate two-factor recovery explanation.