登録 vs アカウント作成 vs ログイン vs サインイン: Japanese Sign Up, Create Account, Log In, Sign In, and Account Setup Words Explained

You open a Japanese app for the first time. The screen shows a button that says 新規登録（しんきとうろく）. Another button says ログイン. You tap the wrong one — and end up trying to log in to an account you haven’t created yet.

This happens to Japanese learners all the time. The words for “sign up,” “create an account,” “log in,” and “sign in” look and feel similar in English — but in Japanese they’re four distinct terms with different meanings, different contexts, and different buttons on almost every app and website you’ll ever use in Japan.

This guide breaks down 登録（とうろく）, アカウント作成（さくせい）, ログイン, and サインイン so you know exactly which word means what — and what to tap next time you’re setting up a Japanese account.

Quick Answer: 登録 vs アカウント作成 vs ログイン vs サインイン

Before diving into the details, here is the essential distinction you need to know:

登録 and アカウント作成 happen once — the first time you use a service. They are about entering or setting up your information. ログイン and サインイン happen every time after that. They are about entering an account you already have.

登録（とうろく）— Register / Sign Up

登録 means to register or save information. In digital contexts, it refers to submitting your details — email address, name, password — so a service can store your record.

Example:
メールアドレスを登録してください。
Mēru adoresu wo tōroku shite kudasai.
Please register your email address.

アカウント作成（さくせい）— Create an Account

アカウント作成 is the full process of building a new account from scratch. Where 登録 focuses on saving a piece of information, アカウント作成 refers to the whole setup flow: entering your details, verifying your email, and completing profile setup.

Example:
新しいアカウントを作成しますか？
Atarashii akaunto wo sakusei shimasu ka?
Would you like to create a new account?

ログイン — Log In

ログイン is the most common term for logging in on Japanese websites and apps. You use it every time you return to a service where you already have an account.

Example:
IDとパスワードを入力してログインしてください。
ID to pasuwādo wo nyūryoku shite roguin shite kudasai.
Please enter your ID and password and log in.

サインイン — Sign In

サインイン means exactly the same as ログイン in practice. The difference is purely about platform style — Google, Microsoft, and some international services display サインイン in their Japanese interfaces, while most Japanese-built apps use ログイン.

Example:
Googleアカウントでサインインしてください。
Gūguru akaunto de sainin shite kudasai.
Please sign in with your Google account.

What Does 登録 Mean?

登録（とうろく）is one of the most versatile words in this group. Its core meaning is “to register” or “to record information in an official list.” In everyday digital life, you’ll see it used in several different ways.

The kanji break down helpfully: 登（のぼる / とう）means “to climb” or “to enter,” and 録（ろく）means “to record.” Together they create the sense of “entering your information into a record.”

Here are the most common compound forms you’ll encounter:

• 新規登録（しんきとうろく） — New registration / sign up for the first time
• 会員登録（かいいんとうろく） — Membership registration (common on EC sites and subscription services)
• メールアドレス登録 — Email address registration
• サービス登録 — Service registration (registering for a specific service)
• 登録済み（とうろくずみ） — Already registered
• 未登録（みとうろく） — Not yet registered

Notice how 登録 is broader than “create an account.” You can 登録 your address, your credit card, your phone number, or your name — it doesn’t always mean building a full account. This is one of the key distinctions beginners miss.

Example 1:
このサービスを使うには会員登録が必要です。
Kono sābisu wo tsukau ni wa kaiin tōroku ga hitsuyō desu.
You need to register as a member to use this service.

Example 2:
まだ登録していないので、新規登録ボタンを押しました。
Mada tōroku shite inai node, shinki tōroku botan wo oshimashita.
Since I wasn’t registered yet, I pressed the new registration button.

Example 3:
クレジットカードを登録しておくと、次回から楽に購入できます。
Kurejitto kādo wo tōroku shite oku to, jikai kara raku ni kōnyū dekimasu.
If you register your credit card, you’ll be able to purchase more easily next time.

Yuka

I always see 新規登録 and 会員登録 on Japanese shopping sites. Are they the same thing?

Rei

Almost! 新規登録 just means “new registration” — it’s the button you press when you’re signing up for the first time. 会員登録 is more specific: it means “membership registration,” which is the type of registration that makes you an official member of that service. You’ll often see 会員登録 on EC sites like Amazon Japan or Rakuten.

What Does アカウント作成 Mean?

アカウント作成（さくせい）literally translates as “account creation.” Where 登録 can refer to saving any individual piece of information, アカウント作成 specifically refers to the complete process of creating a new user account.

The word アカウント comes from English “account,” and 作成（さくせい）means “to create” or “to produce.” The verb form is アカウントを作成する.

You’ll see アカウント作成 on:

• App store pages (“Create an account to get started”)
• Social media platforms (Twitter/X Japan, Instagram Japan)
• Google and Apple account setup flows
• Japanese gaming apps when you start a new profile

Example 1:
アカウントを作成するには、メールアドレスとパスワードが必要です。
Akaunto wo sakusei suru ni wa, mēru adoresu to pasuwādo ga hitsuyō desu.
To create an account, you need an email address and password.

Example 2:
アカウント作成ページに移動してください。
Akaunto sakusei pēji ni idō shite kudasai.
Please go to the account creation page.

Example 3:
新しいアカウントの作成が完了しました。
Atarashii akaunto no sakusei ga kanryō shimashita.
Your new account has been created successfully.

One helpful note for learners: in casual conversation and on many interfaces, 会員登録する and アカウントを作成する are used interchangeably for “signing up.” The nuance is subtle — 会員登録 emphasizes becoming a member, while アカウント作成 emphasizes the technical act of building the account — but for everyday use, treat them as near-synonyms.

What Does ログイン Mean?

ログイン is a direct loanword from English “log in,” and it carries exactly that meaning: accessing an account you already have by entering your credentials.

ログイン is by far the most common “log in” term used across Japanese-made apps and websites. Whether you’re using a banking app, a shopping platform, or a train IC card service, ログイン is the word you’ll see on the button.

Key vocabulary built around ログイン:

• ログインする — to log in (verb form)
• ログイン画面（がめん） — login screen
• ログインID — login ID (username used to log in)
• ログインできない — cannot log in (very common search query)
• ログアウト — log out
• ログイン状態（じょうたい）を保持（ほじ）する — stay logged in / keep me logged in

Example 1:
ログイン画面でIDとパスワードを入力してください。
Roguin gamen de ID to pasuwādo wo nyūryoku shite kudasai.
Please enter your ID and password on the login screen.

Example 2:
パスワードを忘れてログインできません。
Pasuwādo wo wasurete roguin dekimasen.
I forgot my password and cannot log in.

Example 3:
このデバイスでログイン状態を保持しますか？
Kono debaisu de roguin jōtai wo hoji shimasu ka?
Would you like to stay logged in on this device?

What Does サインイン Mean?

サインイン is a loanword from English “sign in,” and in practice it means exactly the same thing as ログイン. The difference is not about meaning — it’s about which company designed the interface.

Google, Microsoft, Apple, and many globally-developed services that have Japanese interfaces tend to use サインイン as their preferred term. Japanese-built apps and services almost always use ログイン. Neither is more correct than the other — they’re just different UI conventions.

The same pattern applies to the “out” versions: サインアウト and ログアウト are interchangeable. You’ll see whichever one matches the platform’s chosen terminology.

Similarly, サインアップ（sign up） appears on some international services instead of 登録. It has the same meaning — registering for the first time — but is less common than 登録 or 新規登録 on Japanese-built platforms.

Example 1:
Googleアカウントでサインインしてください。
Gūguru akaunto de sainin shite kudasai.
Please sign in with your Google account.

Example 2:
Microsoftアカウントにサインインできません。
Maikurosofuto akaunto ni sainin dekimasen.
I cannot sign in to my Microsoft account.

Example 3:
作業が終わったらサインアウトしてください。
Sagyō ga owattara sainauto shite kudasai.
Please sign out when you have finished working.

For your practical purposes as a learner: when you see サインイン, read it as ログイン. They are functionally identical.

登録 vs アカウント作成 — Register vs Create Account

This is the comparison that trips up the most learners, because in English “register” and “create an account” are often treated as the same step. In Japanese, they are related but distinct concepts.

Think of it this way:

• 登録 is the act of saving or submitting information. This can be part of creating an account, or it can be something you do within an existing account (registering a new payment method, for example).
• アカウント作成 is specifically the act of creating a new account entity — building the profile from zero.

In most account signup flows, both happen: you 登録 your details (email, password, name), and by doing so you complete the アカウント作成. The two concepts overlap heavily in the onboarding process, which is why they feel interchangeable.

However, 登録 can exist without アカウント作成. For example:

• Registering your shipping address on an existing Amazon Japan account: 住所を登録する — no new account is being created.
• Adding a new credit card: クレジットカードを登録する — again, just saving information, not making a new account.

Example 1 (登録 = saving info within an existing account):
配送先住所を登録しておくと、次回の購入がスムーズです。
Haisōsaki jūsho wo tōroku shite oku to, jikai no kōnyū ga sumūzu desu.
If you register your delivery address in advance, your next purchase will go smoothly.

Example 2 (アカウント作成 = building a brand-new account):
まず無料アカウントを作成してから、サービスをお試しください。
Mazu muryō akaunto wo sakusei shite kara, sābisu wo otameshi kudasai.
First create a free account, then try out the service.

A common mistake: using アカウント作成 when you mean 登録 in a broader sense. If you want to say “I registered my phone number,” say 電話番号を登録した, not 電話番号でアカウントを作成した — the second sentence implies you made a whole new account using your phone number.

登録 vs ログイン — First Time vs Every Time

This is the most important practical distinction for everyday app use. Miss this one and you’ll end up tapping the wrong button when you open a new service.

登録 is for new users. ログイン is for returning users.

Almost every Japanese app and website has two clearly labeled paths when you first open it:

• 新規登録 (or 会員登録) — for people who don’t have an account yet
• ログイン — for people who already have an account

A very useful phrase to recognize: 登録済みの方はこちら（とうろくずみのかたはこちら） — “For those who are already registered, click here.” This is the “I already have an account” link that takes you to the login screen instead of the signup flow.

Example 1:
まだ登録していない方は、新規登録ボタンをクリックしてください。
Mada tōroku shite inai kata wa, shinki tōroku botan wo kurikku shite kudasai.
If you have not registered yet, please click the new registration button.

Example 2:
登録済みの方はこちらからログインしてください。
Tōroku-zumi no kata wa kochira kara roguin shite kudasai.
Those who are already registered, please log in from here.

Example 3:
このアプリは登録しなくても使えますが、ログインすると全機能が使えます。
Kono apuri wa tōroku shinakute mo tsukaemasu ga, roguin suru to zen kinou ga tsukaemasu.
You can use this app without registering, but if you log in, all features become available.

Yuka

So if I try to ログイン before I’ve done 登録, it just won’t work?

Rei

Exactly right. If you try to log in without an account, you’ll get an error saying something like 「このメールアドレスは登録されていません」 — “This email address has not been registered.” The system has no record of you yet. You need to 登録 first, then ログイン.

ログイン vs サインイン — Nearly the Same, Context Differs

If you ever feel confused about whether to use ログイン or サインイン, the short answer is: it almost never matters which one you say. Both mean the same action — authenticating yourself and entering your account. The distinction is entirely about which platform’s UI you are using.

Here’s a rough guide to which platforms use which:

The same logic applies to logging out:

• Japanese-built platforms: ログアウト
• Google/Microsoft-style platforms: サインアウト

In your own Japanese writing or speaking, either term will be understood. If you want to sound natural in a Japanese context (writing an email about a system issue, for example), match the term to the platform being discussed.

Example 1:
ログインとサインインは基本的に同じ意味です。
Roguin to sainin wa kihonteki ni onaji imi desu.
Log in and sign in basically have the same meaning.

Example 2:
Googleのサービスでは「サインイン」という言葉がよく使われます。
Gūguru no sābisu de wa “sainin” to iu kotoba ga yoku tsukawaremasu.
In Google services, the word “sign in” is commonly used.

Account Flow Vocabulary: Full Reference Table

Here is a complete reference for all the account-related vocabulary you’re likely to encounter on Japanese websites and apps.

Common Mistakes English Speakers Make

Even once you understand each word individually, there are several easy mistakes that trip up learners when they use real Japanese services.

Mistake 1: Trying to ログイン before 登録

This is extremely common. Because English “sign in” and “sign up” look and sound similar, learners sometimes tap ログイン first, expecting to be guided to create an account. Japanese apps don’t work that way — ログイン assumes you already exist in the system. If you’re new, look for 新規登録 first.

Mistake 2: Translating every English “register” as 登録

In English, “register for a course” and “register an account” both use the same word. In Japanese, registering for a course or event is often expressed differently — for example, 申し込む（もうしこむ） (to apply) or 参加登録（さんかとうろく） (participation registration). Always check context before defaulting to 登録.

Mistake 3: Confusing 退会 with ログアウト

This is a serious one. 退会（たいかい） means to withdraw from a service — your account is deleted or your membership is cancelled. ログアウト simply ends your current session. If you are looking for “log out” and accidentally press 退会, you may permanently delete your account. Always double-check which button you are pressing.

Mistake 4: Not recognizing 新規登録 on signup buttons

Japanese signup buttons rarely say “sign up” in katakana. The standard label is 新規登録 or 会員登録. If you’re not familiar with these terms, you might spend time looking for a button labeled サインアップ that may not exist on that particular site.

Mistake 5: Missing the 登録済み link

Many Japanese services show a primary 新規登録 button prominently but put the ログイン option in smaller text below, sometimes labeled 登録済みの方はこちら (For those already registered, click here). New learners often miss this and start a new registration flow when they actually already have an account.

Decision Flowchart

Use this flowchart to figure out which word or button to look for in any situation.

Is this your FIRST TIME using this service?
|
├── YES → Do you want to save a specific piece of info (email, address, card)?
|         |
|         ├── YES → 登録 (register/save info)
|         |         Example: メールアドレスを登録する
|         |
|         └── NO  → Do you want to create a full new account?
|                   |
|                   └── YES → アカウント作成 / 新規登録 / 会員登録
|
└── NO  → You already have an account. You want to enter it.
          |
          ├── Japanese-built app or EC site?
          |   └── YES → ログイン
          |
          └── Google / Microsoft / Apple service?
              └── YES → サインイン (same action as ログイン)

---

Want to LEAVE the service permanently?
└── 退会 (withdraw / delete account) ← NOT ログアウト

Want to CANCEL a paid subscription?
└── 解約 (cancel subscription) ← different from 退会

Want to simply END your current session?
└── ログアウト / サインアウト

Quick Quiz

Fill in the blank with the correct Japanese word. Answers are below.

1. You are using a Japanese shopping site for the first time. You want to become a member. You should press the ________ button.
(a) ログイン　(b) 会員登録　(c) ログアウト

2. You already have an account on a Japanese banking app. You open the app and want to access your account. You press ________.
(a) 新規登録　(b) 退会　(c) ログイン

3. You want to add a new credit card to your existing Amazon Japan account. You say: クレジットカードを ________ する。
(a) 登録　(b) サインイン　(c) 解約

4. You are using Gmail in Japanese. To enter your account, the button says ________.
(a) ログイン　(b) サインイン　(c) 新規登録

5. You want to permanently delete your account on a subscription service. You look for the ________ option.
(a) ログアウト　(b) 退会　(c) 未登録

6. A website shows the message: 「________ の方はこちらからログインしてください。」 This message is for people who already have an account.
(a) 未登録　(b) 解約済み　(c) 登録済み

Answers:
1 → (b) 会員登録
2 → (c) ログイン
3 → (a) 登録
4 → (b) サインイン
5 → (b) 退会
6 → (c) 登録済み

Have you ever got confused by 登録 and ログイン while using a Japanese app or website? Which step tripped you up? Let us know in the comments!

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