Be just looking
Definition 1 of 1
Pro Tip 1/3Retail Context
Used often in shopping to convey you're not ready to purchase anything, but exploring options. 
Salesperson: Can I help you find something? Customer: No thanks, I'm just looking.
Pro Tip 2/3Polite Refusal
A gentle way to decline assistance or communicate you don't need help. 
When approached by store staff, saying 'I'm just looking, thank you' is polite and clear.
Pro Tip 3/3Casual Browsing
Implies a leisurely or relaxed attitude with no pressure to make immediate decisions. 
At the flea market, they were just looking, enjoying the variety without the intent to buy.