user5556: I am currently using Bitcoin-Qt and have just surfed to Electrum's website.
It seems that Electrum only offers an online wallet, not offline. Is that correct?

user112: No, electrum only offers offline wallets.
I think your confusion comes from electrum being a thin client. But this only means that electrum does not download the blockchain, instead it uses a server to query for the the information it needs out of the blockchain. From the elextrum bitcoin.it Wiki page:

Main features:

...
Instant on: the client does not download the blockchain, it requests that information from a server. No delays, always up-to-date.
Transactions are signed locally: Your private keys are not shared with the server. You do not have to trust the server with your money.
...



user2467: That is not correct.
You can run Electrum on an offline computer, make transactions and pass them to the online Electrum (MPK) to broadcast them to the blockchain.
See http://electrum.org/tutorials.html#offline-mpk
Electrum has lots of useful options, so you better read about them in the website.

5556: <p>I am currently using Bitcoin-Qt and have just surfed to Electrum's website.</p>

<p>It seems that Electrum only offers an online wallet, not offline. Is that correct?</p>
 112: <p>No, electrum only offers <em>offline</em> wallets.</p>

<p>I think your confusion comes from electrum being a thin client. But this only means that electrum does not download the blockchain, instead it uses a server to query for the the information it needs out of the blockchain. From the elextrum <a href="https://en.bitcoin.it/wiki/Electrum" rel="nofollow">bitcoin.it Wiki page</a>:</p>

<blockquote>
  <p>Main features:</p>
  
  <ul>
  <li>...</li>
  <li>Instant on: the client does not download the blockchain, it requests that information from a server. No delays, always up-to-date.</li>
  <li>Transactions are signed locally: Your private keys are not shared with the server. You do not have to trust the server with your money.</li>
  <li>...</li>
  </ul>
</blockquote>
 2467: <p>That is not correct.</p>

<p>You can run Electrum on an offline computer, make transactions and pass them to the online Electrum (MPK) to broadcast them to the blockchain.</p>

<p>See <a href="http://electrum.org/tutorials.html#offline-mpk" rel="nofollow">http://electrum.org/tutorials.html#offline-mpk</a></p>

<p>Electrum has lots of useful options, so you better read about them in the website.</p>
