22 Japanese ways to say “Can you keep a secret?”

Secrets are the spice of any close friendship or relationship, aren’t they? Knowing how to ask “Can you keep a secret?” in Japanese adds a whole new layer of connection.

Whether you’re sharing a juicy tidbit or just want to check if someone’s trustworthy, there’s a sweet variety of ways to ask this in Japanese. From casual to polite, you can pick what suits your vibe.

Learning these phrases not only helps you sound more natural but also deepens your understanding of the culture’s nuances around privacy and trust.

Ready to dive in? Let’s explore 22 Japanese ways to say “Can you keep a secret?”—each with friendly tips to get you sounding like a native in no time!

Along the way, you’ll find handy hints to remember and use them confidently, whether chatting with friends or navigating more formal situations.

Let’s get started and unlock these secret-keeping expressions together!

Understanding the Basics of Secret-Keeping Phrases

Before we jump into the full list, it’s good to know the core vocabulary around secrets in Japanese.

The word for secret is 秘密 (ひみつ, himitsu), which literally means “hidden thing.” It’s a foundational word you’ll see again and again.

Also, the verb “to keep” in the context of secrets often uses 守る (まもる, mamoru), meaning “to protect” or “to guard.”

If you’re curious to explore more basic Japanese expressions alongside secret phrases, consider a great beginner phrasebook to get started.

Using these building blocks, you can form polite or casual secret-keeping questions easily.

Now, let’s dive into some casual expressions first that you can use with friends or people you know well.

Part 1: Casual Suggestions

1. 秘密、守れる？ (Himitsu, mamoreru?) – “Can you keep a secret?”

This is a straightforward and casual way to ask if someone can keep a secret.

It breaks down to 秘密 (himitsu) meaning “secret,” and 守れる (mamoreru), the potential form of 守る (mamoru), meaning “can protect” or “can keep.”

It’s easy to remember because it’s short and to the point, perfect for informal chats.

Just drop it with a playful tone when you want to test a friend’s trust.

You might also hear 守ってくれる？ (mamotte kureru?) which softens it into “Will you keep it for me?”

Use this one to keep things light and friendly while still serious about the secret.

2. 内緒にできる？ (Naisho ni dekiru?) – “Can you keep it secret?”

内緒 (ないしょ, naisho) is a casual word meaning “secret” or “private.”

Combined with できる (dekiru), meaning “can do,” this phrase asks simply if someone can keep something private.

This is great for close friends or informal situations.

Be careful not to use this too formally; it’s best reserved for casual conversations.

For example, when whispering a surprise plan to a friend, you can say, “内緒にできる？”

It’s a natural way to check trust without sounding too heavy.

3. 誰にも言わない？ (Dare ni mo iwanai?) – “Won’t you tell anyone?”

This phrase literally asks if the person won’t tell “anyone” (誰にも, dare ni mo).

言わない (iwanai) is the negative form of 言う (iu), “to say” or “to tell.”

It’s a casual but direct way to confirm secrecy.

Use this when you want to be sure the secret won’t spread.

You can say this with a slight smile or serious look depending on how important the secret is.

It’s a useful phrase for friendly but important conversations.

4. これ、内緒だよ。 (Kore, naisho da yo.) – “This is a secret, okay?”

This phrase is a friendly way to declare that what you’re about to share is a secret.

これ (kore) means “this,” and 内緒だよ (naisho da yo) means “it’s a secret, you know.”

It sets a casual, warm tone, telling the listener to keep it quiet.

Adding だよ (da yo) makes it feel personal and informal.

It’s perfect before sharing surprising or fun news with friends.

Try it when you want to emphasize confidentiality yet keep it light.

5. 他言無用だよ。 (Tagon muyou da yo.) – “Don’t tell anyone.”

他言無用 (たごんむよう, tagon muyou) is a stronger phrase meaning “no need to tell others.”

It’s a bit more formal but still used casually among close groups for emphasis.

無用 (muyou) means “unnecessary” or “not allowed,” so it’s a direct way to say “don’t spread this.”

Use it when you want to be clear and firm about keeping the secret.

It’s often used in dramas or serious conversations but fits casual situations too when you want to stress confidentiality.

Pair it with a sincere tone to show you really mean it.

6. 誰にも言ってないよね？ (Dare ni mo ittenai yo ne?) – “You haven’t told anyone, right?”

This phrase is a gentle way to check if the secret has stayed safe.

誰にも (dare ni mo) means “to anyone,” 言ってない (ittenai) is the negative past of “to say,” and よね (yo ne) adds a confirming tone.

It’s casual and friendly, great for double-checking trust.

Use this when you want to confirm without sounding accusatory.

It’s like saying, “I’m trusting you, right?” in a soft way.

It helps keep the conversation light while ensuring the secret is safe.

7. 口が堅い？ (Kuchi ga katai?) – “Is your mouth tight?” (Can you keep a secret?)

This is a fun idiomatic way to ask if someone can keep a secret.

口 (kuchi) means “mouth,” and 堅い (katai) literally means “hard” or “tight.”

It’s like asking if their lips are “sealed.”

Very casual and playful, it’s perfect among good friends.

You might hear this phrase in everyday conversation or anime.

It’s a memorable way to check trust with a bit of humor.

8. この話、秘密にしてね。 (Kono hanashi, himitsu ni shite ne.) – “Please keep this story secret.”

This is a polite but casual request asking someone to keep a story confidential.

この話 (kono hanashi) means “this story,” 秘密にして (himitsu ni shite) means “make it a secret,” and ね (ne) softens it like “okay?”

It’s easy to remember because it follows a simple sentence pattern.

Use it when you want a straightforward but friendly way to ask for secrecy.

It fits well in most informal to semi-formal settings.

Adding ね at the end gives it warmth and approachability.

Part 2: Polite & Formal Suggestions

9. 秘密を守っていただけますか？ (Himitsu o mamotte itadakemasu ka?) – “Could you please keep a secret?”

This is a very polite and formal way to ask someone to keep a secret.

秘密 (himitsu) means “secret,” 守って (mamotte) is the -te form of 守る (mamoru, “to protect”), and いただけますか (itadakemasu ka) is a polite request form.

It’s perfect for use with superiors, colleagues, or in formal situations.

Using this phrase shows respect and humility.

It’s a little longer but worth memorizing for professional contexts.

Pair it with a gentle bow or polite tone to make a good impression.

10. このことは秘密にしていただけますか？ (Kono koto wa himitsu ni shite itadakemasu ka?) – “Could you please keep this matter secret?”

This phrase is a polite and formal way to ask someone to keep a specific matter confidential.

このこと (kono koto) means “this matter,” and the rest is a respectful request to keep it secret.

It’s useful in business or official conversations.

Using していただけますか (shite itadakemasu ka) adds a respectful request tone.

It’s a bit formal, so save it for serious or professional contexts.

It’s a great phrase to show your politeness while emphasizing confidentiality.

11. 他言無用でお願いいたします。 (Tagon muyou de onegai itashimasu.) – “Please do not disclose this to others.”

This is a very formal and respectful way to ask someone not to share information.

他言無用 (tagon muyou) means “no need to tell others,” and お願いいたします (onegai itashimasu) is a very polite way to say “please.”

It’s often used in official letters or serious conversations.

This phrase adds a sense of gravity to the request.

It’s perfect when you want to make sure the listener understands the importance of secrecy.

Use this phrase with formal posture and tone for best effect.

12. 口外しないでください。 (Kougai shinaide kudasai.) – “Please don’t disclose (this).”

口外 (こうがい, kougai) means “disclosure” or “telling others.”

しないでください (shinaide kudasai) is a polite negative request meaning “please don’t do.”

Together, this phrase politely asks someone not to disclose information.

It’s a clear and concise way to emphasize confidentiality.

Use it in formal or semi-formal situations.

Practice the polite tone to ensure it sounds respectful, not harsh.

13. この話は外に漏らさないでください。 (Kono hanashi wa soto ni morasanaide kudasai.) – “Please don’t leak this conversation outside.”

This phrase is a polite way to ask someone not to spread information outside your circle.

漏らす (もらす, morasu) means “to leak” or “to reveal.”

It’s very explicit about not sharing the secret externally.

Use this in business or sensitive personal conversations.

It conveys a serious tone but remains polite.

Good for emphasizing trustworthiness in formal contexts.

14. お話ししたことは内々にお願いします。 (Ohanashi shita koto wa uchiuchi ni onegai shimasu.) – “Please keep what I told you within a close circle.”

内々 (うちうち, uchiuchi) means “within a close group” or “in-house.”

お話ししたこと (ohanashi shita koto) means “what I told you.”

This phrase politely asks someone to keep information within a trusted circle.

It’s useful in workplaces or formal organizations.

The phrase feels respectful and thoughtful.

Good for when you want to emphasize discretion politely.

15. 秘密厳守でお願いします。 (Himitsu genshu de onegai shimasu.) – “Please strictly keep this secret.”

秘密厳守 (ひみつげんしゅ, himitsu genshu) means “strict observance of secrecy.”

でお願いします (de onegai shimasu) is a polite way to make a request.

This phrase emphasizes strict confidentiality politely.

It’s common in business, legal, or formal social situations.

Use this when the secret is very sensitive.

It communicates seriousness and respect simultaneously.

16. このことは絶対に秘密にしてください。 (Kono koto wa zettai ni himitsu ni shite kudasai.) – “Please absolutely keep this a secret.”

絶対に (zettai ni) means “absolutely” or “definitely.”

This phrase is a firm but polite request to keep something secret.

It’s stronger than some other polite forms and shows importance.

Use it when you want to emphasize that the secret must not be revealed under any circumstances.

Great for serious or urgent situations.

Practice the polite tone to keep it respectful.

Part 3: Very Casual / Native-like Expressions

17. 口止めできる？ (Kuchidome dekiru?) – “Can you keep your mouth shut?”

口止め (くちどめ, kuchidome) means “mouth-stopping” or “gag order.”

できる (dekiru) means “can do.”

This phrase is very casual and a bit cheeky, used among close friends.

It’s like asking, “Can you zip it?” in a fun way.

Use it only with people who understand your humor and tone.

It’s memorable and native-sounding but not appropriate in formal settings.

18. ここだけの話ね。 (Koko dake no hanashi ne.) – “This is just between us.”

ここだけの話 (koko dake no hanashi) means “this story only here,” implying confidentiality.

ね (ne) softens the phrase to feel friendly and intimate.

This phrase is commonly used when sharing secrets casually.

It subtly asks the listener to keep the info private.

Great for informal social settings.

It’s a warm, natural way to say “Can you keep a secret?”

19. 誰にも言わないでよ。 (Dare ni mo iwanaide yo.) – “Don’t tell anyone, okay?”

This is a casual and slightly playful way to ask someone not to tell anyone your secret.

言わないで (iwanaide) is the negative command form “don’t say,” and よ (yo) adds emphasis.

It’s very common among friends and family.

Use it when you want to sound friendly but clear.

It’s easy to remember and naturally fits daily conversation.

Pair it with body language like a wink or a smile for effect.

20. 絶対内緒だよ。 (Zettai naisho da yo.) – “Absolutely a secret, okay?”

絶対 (zettai) means “absolutely,” and 内緒だよ (naisho da yo) means “it’s a secret, you know.”

This phrase is casual but strong in its request.

It’s often used by children and young people but widely understood.

It adds a playful but serious tone.

Great for emphasizing secrecy with friends or siblings.

Easy to memorize and fun to use.

21. これは秘密ね。 (Kore wa himitsu ne.) – “This is a secret, okay?”

A simple and sweet way to tell someone that what you’re sharing is a secret.

It’s straightforward and casual, suitable for all ages.

ね (ne) adds warmth and friendliness.

Use it to gently remind someone to keep quiet.

It’s perfect for everyday conversations.

Try it with a soft tone for best effect.

22. 内緒にしておいてね。 (Naisho ni shite oite ne.) – “Please keep it secret for me.”

This phrase literally means “Please keep it secret and leave it that way.”

It’s casual but polite enough for friends and acquaintances.

しておいて (shite oite) implies doing something in advance or keeping it ongoing.

Adding ね (ne) softens the request warmly.

Use it to ask someone to keep something confidential with a gentle tone.

It’s a smooth, natural way to ask for secrecy.

Concluding Thought

Learning different ways to say “Can you keep a secret?” in Japanese is a fun way to deepen your language skills and cultural understanding.

From casual chats with friends to formal business requests, there’s a phrase for every situation that helps you build trust and connection.

Keep practicing these expressions, and soon you’ll be effortlessly weaving secret-keeping into your Japanese conversations with warmth and confidence!