How to Use an Onsen in Japan: Rules, Etiquette, and Tips for First-Time Visitors

Imagine soaking in a warm outdoor bath while snow falls gently around you, or relaxing in a hot spring surrounded by the brilliant colors of autumn.

Visiting an onsen is one of the most memorable experiences you can have in Japan. But if it is your first time, you may have a few questions.

Do you really have to bathe naked? Are tattoos allowed? Can you bring a towel into the water? And what is the difference between an onsen, a sento, and a super sento?

This guide explains how to use an onsen in Japan, including step-by-step bathing instructions, essential etiquette, tattoo policies, and practical tips for first-time visitors.

Many of these rules also apply to traditional public bathhouses and modern super sento facilities, so this guide will help you enjoy a wide range of Japanese bathing experiences.

1. What Is an Onsen in Japan?

Japan is famous for its hot springs, which can be found throughout the country thanks to its extensive geothermal activity.

For many Japanese people, an onsen is much more than a place to wash. It is somewhere to relax, appreciate nature, enjoy the changing seasons, and take a break from everyday life.

Some onsen are located in traditional inns called ryokan, where guests can combine bathing with Japanese-style accommodation and meals. Others are day-use facilities that you can visit for just a few hours.

One of the most important features of Japanese bathing culture is simple: you wash your body before entering a shared bathtub.

Understanding this basic custom will make your first onsen visit much easier.

2. Onsen vs. Sento vs. Super Sento: What's the Difference?

Not every public bath in Japan uses natural hot spring water. Knowing the difference between an onsen, a sento, and a super sento will help you choose the right experience.

Onsen: Natural Hot Springs

Under Japanese law, an onsen is defined by specific conditions relating to water or other substances emerging from underground.

Generally, water qualifies as onsen water if its temperature at the source is at least 25°C (77°F), or if it contains certain minerals or substances at levels specified by law.

This means that natural hot spring water does not always emerge from the ground at a high temperature. Some facilities heat their spring water before use.

Onsen facilities may also add water, circulate or filter the water, or use disinfection systems. Not every natural hot spring bath is a continuously flowing, untreated spring-water bath.

Sento: Traditional Public Bathhouses

A sento is a public bathhouse traditionally used by local residents as part of everyday life.

Many sento heat ordinary water rather than using natural hot spring water. However, some sento do use genuine onsen water.

Visiting a neighborhood sento can be a wonderful way to experience a more local side of Japanese culture.

Super Sento: Modern Bathing and Relaxation Facilities

A super sento is typically a larger bathing facility offering multiple baths and additional amenities.

Depending on the location, you may find outdoor baths, saunas, relaxation lounges, restaurants, and other services.

Some super sento use natural hot spring water, while others mainly use heated ordinary water.

The name "super sento" does not automatically mean that the facility has a natural hot spring.

Does an Outdoor Bath Mean It Is a Natural Hot Spring?

No. An outdoor bath, called a rotenburo, simply means that the bathtub is located outdoors.

It may contain natural hot spring water, but it may also use ordinary heated water.

If experiencing a genuine onsen is important to you, check the facility's official website or its posted information about the bathing water.

Good to know: The bathing etiquette explained below applies to many onsen, sento, and super sento facilities, even when their water sources differ.

3. Before Entering an Onsen: What You Need to Know

Do You Have to Bathe Naked?

In most traditional Japanese communal baths with separate men's and women's areas, visitors bathe naked.

Swimsuits and underwear are generally not permitted in these bathing areas.

This may feel unfamiliar at first, but it is a normal part of Japanese bathing culture.

There are exceptions, including certain mixed-gender bathing areas, hot spring pools, and facilities specifically designed for swimsuit use.

Always check the rules of the particular facility you plan to visit.

Should You Bring a Towel?

Hotels and ryokan often provide towels for overnight guests.

At day-use onsen and sento, you may need to bring your own towel or pay for a rental or purchase.

Check the facility's website before visiting, especially if you are traveling with limited luggage.

Check the Men's and Women's Bath Signs

Most communal bathing areas are separated by gender.

Look for the Japanese signs 男湯 (men's bath) and 女湯 (women's bath), or the facility's multilingual signs.

Some ryokan switch the men's and women's bathing areas at different times of the day, so always check before entering.

Take Care of Your Health Before Bathing

Hot baths can be relaxing, but very hot water and long bathing sessions can place stress on your body.

Avoid bathing after drinking alcohol or when you feel unwell or extremely exhausted.

Drink water before and after bathing, and stand up slowly when leaving the bathtub.

If you have a medical condition, are pregnant, or are unsure whether hot bathing is suitable for you, seek appropriate medical advice and follow the facility's safety instructions.

4. How to Use an Onsen: A Step-by-Step Guide

First-time visitors can follow these seven simple steps to enjoy a traditional Japanese communal bath.

Step 1: Check In at Reception

At a day-use facility, you usually pay at reception or purchase a ticket from a machine.

Some facilities ask you to place your shoes in a locker or provide a wristband for lockers and purchases.

Ask about towels, bathing amenities, and any additional charges before entering.

Step 2: Find the Correct Bathing Area

Follow the signs to the appropriate bathing area.

Remember that some ryokan change the designated men's and women's baths depending on the time of day.

Step 3: Undress in the Changing Room

Remove your clothes in the changing room and place your belongings in a locker or designated basket.

Keep valuables such as your wallet and phone in a secure locker whenever possible.

Phones and cameras should generally be left outside the bathing area.

Step 4: Wash Your Body Before Entering the Bath

This is one of the most important rules of Japanese onsen etiquette.

Before entering a shared bathtub, thoroughly wash your body at the washing stations and rinse away all soap and shampoo.

Most facilities have showers, taps, stools, and washbasins.

Be careful not to splash other visitors when using the shower.

Some bathhouses do not provide shampoo or body soap, so bring your own if necessary.

Step 5: Get Used to the Water Temperature

Many bathers pour warm water over their bodies before entering the tub. This practice is called kakeyu.

Pour water gradually, starting with your feet and legs, to check the temperature and help your body adjust.

Some facilities provide a designated area for kakeyu.

Step 6: Enter the Bath Slowly and Relax

Step into the bathtub carefully and enjoy the warm water.

Water temperatures vary between facilities and individual baths. If the water feels too hot, do not force yourself to stay.

Avoid swimming, splashing, or speaking loudly.

Be considerate of the people around you and enjoy the peaceful atmosphere.

Step 7: Dry Off Before Returning to the Changing Room

Before leaving the bathing area, use a small towel to remove excess water from your body.

This helps prevent the changing-room floor from becoming unnecessarily wet.

After bathing, drink water and take some time to rest.

Whether you should rinse your skin after an onsen bath depends on the spring water, your skin sensitivity, and the facility's guidance. If the water irritates your skin, rinse as needed.

5. Essential Onsen Etiquette: Rules You Should Follow

Never Wash Yourself Inside the Bathtub

Shared bathtubs are for soaking, not washing.

Use soap and shampoo only at the washing stations.

Keep Towels Out of the Water

In traditional communal baths, you should not put your towel into the bathtub.

Keep your small towel outside the water and follow any specific instructions provided by the facility.

Tie Up Long Hair

If you have long hair, tie it up so that it does not enter the shared bathwater.

Do Not Take Photos or Videos

Photography and video recording are generally prohibited in communal bathing areas and changing rooms to protect everyone's privacy.

Some facilities also prohibit bringing smartphones into these areas.

If you want photographs, use the facility's official images or take pictures only in areas where photography is explicitly permitted.

Do Not Swim or Make Excessive Noise

A communal bath is not a swimming pool.

Avoid swimming, splashing, or disturbing other bathers with loud conversations.

Leave the Washing Area Tidy

Take care when using showers so that water does not spray onto nearby people.

Return stools and washbasins to their proper places according to the facility's instructions.

Follow Separate Rules for Saunas and Stone Spas

Super sento facilities often include saunas and heated stone spa areas, sometimes called ganbanyoku.

These areas may have additional rules concerning showers, towels, special clothing, food, drinks, and conversation.

Always read the posted instructions before using them.

6. Tattoos and Onsen in Japan: What Visitors Need to Know

Some Japanese bathing facilities still restrict entry for people with tattoos.

These policies have historical and social backgrounds, but tattoos are not banned at every onsen in Japan.

Policies vary considerably between facilities.

Some welcome guests with tattoos, some permit small tattoos if they are covered with special stickers, and others restrict entry regardless of tattoo size.

Check the official website or contact the facility before visiting.

Private Baths: A Possible Alternative

A private bath, called a kashikiri-buro, allows you to use a bathing area privately for a specified period.

It can be a good option for visitors with tattoos or anyone who feels uncomfortable bathing naked with strangers.

However, private baths do not automatically permit tattoos or swimsuits. Check the booking conditions and facility rules in advance.

Guest Rooms with Private Baths

Some ryokan offer guest rooms with private indoor baths or outdoor bathtubs.

These rooms provide greater privacy, but not every private guest-room bath contains natural hot spring water.

Confirm the water source and any relevant policies when making your reservation.

7. How to Enjoy Japan's Bathing Culture Even More

Experience the Seasons in an Outdoor Bath

One of the greatest pleasures of bathing in Japan is experiencing nature throughout the year.

In spring, you might enjoy fresh greenery or cherry blossoms. Summer brings lush mountain scenery, while autumn offers colorful leaves.

In winter, soaking in a warm outdoor bath while looking out at snow-covered trees can be unforgettable.

Remember that an outdoor bath does not necessarily use natural hot spring water. Check the facility's information if this matters to you.

Stay at a Traditional Ryokan

A ryokan stay offers more than bathing.

You may have the opportunity to relax in a Japanese-style room, enjoy traditional meals, and experience Japanese hospitality.

Many ryokan provide yukata, a casual cotton kimono, for guests to wear during their stay.

Some properties also offer private baths or bathing areas reserved for overnight guests.

Try a Super Sento for a Convenient Day Visit

You do not need to stay overnight at a hot spring resort to experience Japanese bathing culture.

Super sento facilities can be convenient options in cities and suburban areas.

Some offer several types of baths, saunas, dining areas, and relaxation spaces, making them appealing places to rest after a busy day of sightseeing.

Even if the facility does not use natural hot spring water, you can still enjoy many aspects of Japan's bathing traditions.

Onsen, sento, and super sento offer different experiences, but many of their basic bathing customs are the same.

Looking for somewhere special to experience Japan's hot springs? Explore our guide to Japanese onsen experiences and five famous hot spring destinations, including Hakone, Kusatsu, Kinosaki, Beppu, and Ibusuki's unique sand baths.

8. Frequently Asked Questions About Japanese Onsen

Can I Wear a Swimsuit in a Japanese Onsen?

In most traditional communal baths separated by gender, swimsuits are not allowed and visitors bathe naked.

Some hot spring pools and designated mixed-gender facilities have different rules. Check before visiting.

Can I Visit an Onsen If I Have Tattoos?

It depends on the facility. Some allow tattoos, some accept covered tattoos, and others restrict entry.

Always confirm the policy in advance.

Do I Need to Bring My Own Towel?

Some facilities provide towels, while others require you to bring your own or pay for a rental.

Check the facility's website before your visit.

Is Onsen Water Very Hot?

Water temperatures vary between facilities and individual baths.

If you are sensitive to heat, choose a cooler bath when available and start with a short soak.

Can Children Use an Onsen?

Many facilities welcome children, but age limits, rules for accompanying a parent into gender-separated baths, and policies for children who still wear diapers vary.

Check the facility's rules before visiting with children.

Can I Visit an Onsen During My Period?

Consider the facility's rules, your comfort, and how you are feeling.

If you feel unwell or have heavy bleeding, postponing your bath may be more comfortable. Check the facility's policy and seek medical advice if needed.

Do I Need to Make a Reservation?

Many day-use onsen and sento accept walk-in visitors.

However, private baths, special packages, and overnight stays may require reservations.

Check opening hours, closing days, and booking requirements in advance.

Do These Etiquette Rules Apply to Super Sento?

Yes. Washing before entering a shared bath, keeping towels out of the water, avoiding photography, and respecting other guests are common rules at many super sento and traditional sento.

Saunas, stone spas, and swimsuit areas may have additional rules.

Are Onsen and Sento the Same Thing?

No. An onsen refers to natural hot spring water or related geothermal substances that meet Japan's legal criteria.

A sento is a type of public bathhouse that may or may not use natural hot spring water.

9. Final Thoughts: Experience Japan's Bathing Culture with All Five Senses

Visiting a Japanese onsen for the first time may seem intimidating, especially if you are unfamiliar with communal bathing customs.

But the essential rules are straightforward: wash before entering the bath, help keep the shared water clean, and be considerate of other guests.

Once you understand these basics, you can focus on what makes the experience special.

Imagine watching autumn leaves drift through the air, listening to the gentle sound of flowing water, or feeling the cool mountain breeze while relaxing in a warm outdoor bath.

There is something memorable about experiencing Japan's changing seasons from the peaceful surroundings of a bath.

A traditional ryokan, a neighborhood sento, and a modern super sento each offer a different window into Japanese life.

Whether you choose a natural hot spring or another type of public bath, understanding the differences and respecting the local rules will help you find an experience that suits you.

We encourage you to experience Japan's bathing culture not simply as a way to get clean, but as an opportunity to appreciate Japanese traditions, daily life, and nature with all five senses.

It may become one of the most relaxing and unforgettable moments of your journey.

For more practical advice before your trip, explore our Japan Travel Essentials guide.

At Japan Insider Guide, we believe that understanding local customs helps travelers discover a deeper and more rewarding side of Japan.