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Is it OK to use a credit card on zero-interest to pay some other credit cards with higher-interest?
I've done exactly what you are describing and it was a great move for me. A few years back I had two credit cards. One had a $6000 balance and a fairly high interest rate that I was making steady payments to (including interest).  The other was actually tied to a HELOC (home equity line of credit) whose interest rate was fixed to "prime", which was very low at the time, I think my effective rate on the card was around 3%.  So, I pulled out one of the "cash advance checks" from the HELOC account and paid off the $6000 balance. Then I started making my monthly payments against the balance on the HELOC, and paid it off a bit more quickly and with less overall money spent because I was paying way less interest. Another, similar, tactic is to find a card that doesn't charge fees for balance transfers and that has a 0% interest rate for the first 12 months on transferred balances. I am pretty sure they are out there. Open an account on that card, transfer the balance to it, and pay it down within 12 months. And, try not to use the card for anything else if you can help it.