that's what I was looking for, thanks.
I'd not use the same private key again, because in case you have malware on your computer, someone might have access to your private key. I would not use any web utilites, because im not sure if they are that reputable at all.
Which wallet are you using for your BTC, as i can write you a guide with full commands if needed for exporting the private key from the original wallet and then for importing it to the new one. If you wish to get the guide written, i'd suggest running Malwarebytes scan (after sending the BTC to some other address of course) for example because it's a decent scanner and still a good practice to do while handling money.
Of course you can use GNU/Linux systems too for this, which would be more secure but it takes more technical knowledge most often.
Thank you for the tips onnz, great contributions.