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My Electrum seed won't restore in another wallet

This is not your mistake, and not a damaged backup

Type an Electrum seed into another wallet and you get one of two outcomes: it refuses the phrase as invalid, or — worse — it accepts it and shows you an empty wallet. Both are alarming and neither means you lost anything.

Electrum predates BIP-39, the standard nearly every wallet uses today. When Electrum defined its seed format, that standard did not exist yet. Its own documentation says so plainly: "BIP39 was introduced two years after Electrum" — Electrum documentation.

Why they are incompatible, and why that was deliberate

The difference is not cosmetic. BIP-39 turns your words into a number using a fixed list of 2048 words; without that exact list nothing can be reconstructed, and there is a separate list per language. Electrum avoids that on purpose: it derives the master key by hashing the phrase itself, depending on no wordlist at all.

Electrum's documentation explains the decision and criticises the later standard directly. BIP-39, it says, "still requires the wordlist in order to compute its checksum, which is plainly inconsistent", and warns that one wordlist per language "threatens the portability of BIP39 seed phrases".

So your Electrum seed is arguably more portable by design — and that same decision is exactly why other wallets don't recognise it.

How to tell which one you have, without risking anything

Count the words and remember where the seed came from. An Electrum phrase is usually 12 or 13 words and was generated by Electrum. A BIP-39 phrase is 12 or 24 and came from almost anything else: a hardware wallet, a phone app, an exchange.

The definitive test needs no new software: open it in Electrum. If Electrum accepts it and your funds appear, it is an Electrum seed and you now know where your wallet lives.

There is also a hint that costs nothing: BIP-39 has a checksum, so a BIP-39 phrase with one wrong word is almost always rejected outright. Electrum does not validate the same way.

What to actually do

If you are happy staying on Electrum, there is nothing to fix. Your seed is valid where it matters.

If you want to move to another wallet, do not try to convert the seed — it does not convert. Create a fresh wallet in the software you want, with its own seed, and move the funds with a transaction. That is an ordinary Bitcoin operation and it does not require either program to understand the other's format.

Write down the new seed before moving anything, and do not destroy the old one until the transaction has confirmed.

And the line worth writing down now

This was never a case of lost words. The twelve words survived perfectly; what went missing was the context — which program created them.

Next to your seed, write which wallet generated it and in what year. Two lines that cannot spend a single satoshi, and that save whoever uses that backup — future you, or someone else entirely — the exact scare you just had.