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Why posted in Bitcoin Discussion, I feel it fits much better in
Bitcoin Technical Support?
Electrum is a well suited light wallet that has a good reputation. It can also be used in safer operating modes, like with a hot (online) watch-only wallet part and a secure offline cold wallet part, where the cold part is only used for signing.
You should understand what it means and how to operate those two hot and cold wallet parts. If you don't I highly recommend to brush up your knowledge!
When you ask for a safe withdrawal of a paperwallet, I would avoid to touch the private key of the paperwallet with an online device. Sure, I would make a distinction if the paperwallet only holds a rather low amount of coins/value.
To play it safe:
- install Electrum only from https://electrum.org; verify your download, never omit this step
- create a new watch-only wallet with the public address of the paperwallet on an online device; I recommend not to use your daily computer, better a second (used) one with Linux as OS, you can also simply boot a live Linux, but data persistence is a bit more tricky with those
- create a spending transaction withdrawing all UTXOs from the paperwallet (if there are more than one UTXO) to a public address that you control (carefully verify the correctness of the copy/pasted destination address); pay attention to a reasonable amount for the transaction fee (have a look at mempool.space for currently needed transaction fees; with Electrum your transaction have RBF enabled anyway) --- remember to understand how Bitcoin transactions work, a transaction input is spent as a whole; if you want to spend only part of it, the excess has to go to another output (can be the same as the input address) or it will become transaction fee!
- as you can't sign the transaction in a watch-only wallet, export it as PSBT file to a thumbdrive
- for the cold wallet you need an offline device that can't ever connect to the internet, best not even accidently; best is a dedicated offline device for this, but it can be accomplished e.g. with booting TAILS without a network connection; I don't go into details here further, there are topics with all the details for this
- create a new cold wallet by importing the private key of the paperwallet on your "cold" offline device
- import the PSBT for the spending transaction, verify it carefully and if all is good, sign it and export the signed transaction
- I would recommend not to destroy the private key of the paperwallet even when you have withdrawn it fully; you never know...
- now back on the hot online wallet import the signed transaction, check it a last time and broadcast it
If you're not familiar with certain steps, you can ask or do your own research. I'm not going to spoon-feed you.