If you’re shopping around and comparing various credit offers, make sure you don’t actually apply for credit until you’ve decided on the best deal.
Every time you make an application for a credit card, it’s noted on your credit file.
If you make too many or your applications are refused, it might suggest you’re in financial difficulty, which can damage your credit rating.
This might lead other lenders rejecting an application or increasing the interest rate at which they are prepared to lend.
If you want to know whether you're eligible for a card, or the price you’re likely to be offered, ask the card provider if they can make a ‘quotation search’ or ‘soft search credit check’ also known as an ‘eligibility calculator’. This search doesn’t leave a mark on your credit file, rather than an application search, which does.
If they refuse, think carefully about whether you want to go ahead.
Also, if you’re offered a quote, check whether this is guaranteed.
Some quotes might just be indications of likely eligibility or price. Most lenders will reserve the right to change their mind if new information comes to light.