The Japanese hot spring — the onsen — intimidates first-time visitors more than almost anything else in Japan. Being naked in front of strangers, a wall of rules you can't read, the fear of doing something embarrassing… it's enough to make people skip one of the best experiences the country offers.
Here's the reassurance: the rules are short, they all make sense, and once you know them you'll want to soak every single night. This is the complete beginner's guide.
The one rule that matters most: wash before you soak
If you remember nothing else, remember this. An onsen is for soaking a clean body, not for cleaning yourself. Before you get into the shared bath, you sit at the shower stations along the wall and wash your entire body — soap, shampoo, the works — and rinse off every trace of suds. Only then do you get into the communal tub.
This is the whole foundation of onsen culture. The water is shared and everyone trusts that everyone else came in clean. Nail this one thing and you're 90% of the way there.
Yes, you bathe naked
Swimsuits are not worn in traditional Japanese baths. Everyone is naked, nobody is looking, and it stops feeling strange within about ninety seconds. Baths are almost always separated by gender (look for the noren curtains: 男 = men, 女 = women, usually blue and red respectively).
The small towel: keep it out of the water
You'll get a small towel. Use it for washing and for a bit of modesty as you walk around — but never put it in the bathwater. Most people fold it and rest it on their head or on the edge of the tub. If you have long hair, tie it up so it doesn't touch the water either.
Keep it calm
An onsen is closer to a quiet spa than a swimming pool. No swimming, no splashing, no diving, no loud conversation, and absolutely no phones or cameras in the bathing area (this one is about everyone's privacy). Move gently, speak softly, and let yourself relax.
Tattoos: plan ahead, don't panic
Tattoos still carry an old association in Japan, and some baths restrict them. If you have ink, you have three easy options:
- Use a tattoo-friendly onsen — there are many now, and they're easy to find online.
- Cover a small tattoo with a waterproof patch.
- Book a private bath (kashikiri) or a room with its own bath.
No drama — just check before you go, and you're fine. If you'd rather skip the guesswork, Hakone day trips from Tokyo often include a bath with clear rules, and some bookable private onsen experiences welcome tattoos.
The step-by-step, start to finish
- Take your shoes off if required at the entrance.
- Pay / enter the correct gender's changing room.
- Undress completely; put clothes and your big towel in a basket or locker.
- Take only your small towel to the bathing area.
- Sit at a shower station and wash your whole body thoroughly; rinse all soap off.
- Get into the tub slowly. Keep your towel out of the water.
- Soak, relax, and stay hydrated (don't overdo the heat).
- Before returning to the changing room, some people lightly towel off so they don't drip everywhere.
- Dress, drink some water, and enjoy that post-onsen glow.
Bonus: onsen at a ryokan (traditional inn)
If you're staying at a ryokan, you'll also meet the yukata (a light cotton robe) and slippers. Two quick tips: wear the yukata left side over right (i.e. the left flap on top; right-over-left is used only when dressing the deceased), and remember there are separate slippers just for the toilet — swap into them in the bathroom and swap back when you leave. Wearing toilet slippers into the tatami room is the classic rookie mistake.
The payoff
A proper onsen soak after a day of walking is one of the great pleasures on the planet. Learn these few rules and you stop tensing up and start looking forward to it — which is exactly the point. Relax; you've got this. And if you want a first soak with zero uncertainty, a guided onsen experience near Tokyo walks you through every step.
Want the whole picture? Grab the free 10 Things Japan Quietly Wishes Every Visitor Knew — onsen, shrines, trains, and the rules nobody explains, on two pages you can keep on your phone.
And if you want the everyday version of all this — the ¥550 neighbourhood bath where locals actually wash, rather than the resort — read how to use a sentō.
