No Tattoos (Most Places)
Most traditional onsen and sento prohibit tattoos of any size. Some modern facilities allow them with tattoo covers. Always check in advance.
Wash BEFORE Entering
You MUST thoroughly wash your body at the shower station before entering the communal bath. This is non-negotiable.
No Swimwear
Traditional onsen and sento are entered completely nude. Swimwear is NOT allowed in the bath itself.
No Photos in Bathing Areas
Photography is strictly forbidden in all changing rooms and bathing areas. This is a serious privacy violation.
Small Towel Only
Only a small modesty towel is allowed near the bath. Keep it folded on your head or place it on the side — never dip it in the water.
No Alcohol Before Bathing
Do not enter an onsen if you have been drinking alcohol. It is dangerous and disrespectful.
Keep Quiet
Onsen are places of relaxation. Speak quietly and avoid loud conversations or horseplay.