完了する

The Japanese verb 完了する (kanryou suru) is a formal and highly structured way to express that a specific process, task, or phase has been fully completed. Unlike the more common and casual verb 終わる (owaru), which simply means that something has come to an end, 完了する carries a distinct nuance of a procedure being executed from start to finish, culminating in a state of perfect completion. This word is deeply embedded in administrative, technical, and business contexts. When you see or hear 完了する, it implies that all necessary steps have been taken, all requirements have been met, and there is nothing left to do regarding that specific item. The kanji breakdown is particularly revealing. The first character, 完 (kan), means 'perfect' or 'complete.' You see it in words like 完全 (kanzen - perfect) and 完成 (kansei - completion of a product). The second character, 了 (ryou), means 'to finish,' 'to comprehend,' or 'to complete.' It appears in words like 了解 (ryoukai - understanding/agreement) and 終了 (shuuryou - end). Together, they form a compound that leaves no ambiguity: the task is definitively and perfectly finished. In modern Japanese society, this word is inescapable. Every time you download an app, install a software update, submit an online form, or pay for an item at a self-checkout kiosk, you will inevitably encounter the phrase 完了しました (kanryou shimashita). It is the ultimate digital and bureaucratic stamp of approval.

Kanji 完 (Kan)

Means perfect, complete, or whole. It indicates that nothing is missing from the final state.

Kanji 了 (Ryou)

Means to finish, complete, or understand. It emphasizes the conclusion of an action or process.

Suru Verb Construction

By attaching する (suru) to the noun 完了, it transforms into a verb meaning 'to complete' or 'to be completed.'

Understanding the grammatical behavior of 完了する is crucial for learners at the B1 level. It is predominantly used as an intransitive verb, meaning it takes the particle が (ga) rather than を (wo). For example, you would say タスクが完了する (The task completes/is completed) rather than タスクを完了する, although the latter is sometimes used in highly specific, active business contexts where a person is emphasizing their direct action of completing the task. However, the intransitive usage is far more natural and ubiquitous. This reflects a common feature of formal Japanese, where actions are often described as states that have come to pass, rather than direct actions forced by an individual. This subtle shift in perspective—from 'I finished the task' to 'The task has reached a state of completion'—is a hallmark of polite, professional communication.

To truly master 完了する, one must also appreciate its role in compound nouns. Words like 完了形 (kanryoukei - perfect tense in grammar), 未完了 (mikanryou - incomplete), and 完了報告 (kanryou houkoku - completion report) are standard vocabulary in academic and corporate environments. The concept of 'completion' in Japanese culture is tied to thoroughness and responsibility. When a professional states that a task is 完了しました, they are taking ownership of the fact that the work has been done to the required standard, without errors or omissions. This is why you rarely hear it used for trivial matters. You wouldn't say 宿題が完了した (My homework is complete) unless you were speaking in a deliberately robotic, humorous, or overly dramatic tone. Instead, you would use 終わった (owatta). Therefore, learning 完了する is not just about memorizing a definition; it is about acquiring the appropriate register and cultural context for professional and technical communication in Japanese.

Using 完了する (kanryou suru) correctly requires an understanding of its grammatical structure, its typical conjugations, and the specific particles it pairs with. As a suru-verb (Group 3), its conjugation follows the standard, predictable patterns of する. The most common forms you will encounter are the past polite form 完了しました (kanryou shimashita - has been completed), the te-form 完了して (kanryou shite - complete and then...), and the passive form 完了される (kanryou sareru - to be completed). However, because 完了する is most frequently used to describe a state that has been achieved, the past tense (完了した / 完了しました) is overwhelmingly the most common iteration. When you are describing a process that is currently finishing, you might use 完了しつつある (kanryou shitsutsu aru - is in the process of completing), though this is highly formal. The most critical grammatical point for learners is particle usage. 完了する is primarily an intransitive verb. This means the subject of the sentence is the thing that is being completed, marked by the particle が (ga) or は (wa). For example, 登録が完了しました (Touroku ga kanryou shimashita - Registration has completed). This structure emphasizes the outcome rather than the agent performing the action.

Intransitive Usage (が)

The standard way to use the verb. Example: 準備が完了する (The preparations complete).

Transitive Usage (を)

Less common, used when emphasizing the actor's execution. Example: 任務を完了する (To complete the mission).

Noun Form (完了)

Used in compound words or with other verbs. Example: 完了を知らせる (To notify of completion).

While the intransitive usage is standard, you will occasionally see 完了する used transitively with the particle を (wo). This happens when the speaker wants to emphasize their active role in finishing a highly formal or significant task. For instance, a project manager might say プロジェクトを完了させる (I will make the project complete / I will complete the project), using the causative form to show strong agency. In military, gaming, or highly structured corporate contexts, you might hear ミッションを完了した (Mission completed). However, for everyday business and digital interactions, stick to the intransitive が完了する. Another vital aspect of using this word is pairing it with the right nouns. It collocates strongly with words related to processes, systems, and procedures. Common pairings include 手続き (tetsuzuki - procedure), 登録 (touroku - registration), 処理 (shori - processing), 審査 (shinsa - inspection/screening), and 設定 (settei - settings). You will almost never see it paired with nouns representing physical objects being built (use 完成する for that) or everyday activities like eating or reading (use 終わる for that).

Furthermore, 完了する frequently appears in conditional clauses. For example, 完了したら (kanryou shitara - when/if it completes) or 完了次第 (kanryou shidai - as soon as it completes). These structures are essential for explaining workflows. A typical business email might read: 確認が完了次第、ご連絡いたします (Kakunin ga kanryou shidai, gorenraku itashimasu - I will contact you as soon as the confirmation is complete). This demonstrates how 完了 acts as a pivot point in professional communication, marking the transition from one phase of work to the next. By mastering these specific sentence patterns, learners can significantly elevate the formality and precision of their Japanese, moving beyond the basic A2 level of simply saying '終わりました' to a much more sophisticated, B1/B2 level of corporate and administrative fluency.

The environments where you will hear or read 完了する (kanryou suru) are highly specific and remarkably consistent. Because it denotes the formal conclusion of a process, its primary domains are technology, business, administration, and formal announcements. If you live in Japan or interact with Japanese systems, this word is visually and aurally omnipresent. The most common place you will encounter it is on digital interfaces. Every piece of software, every smartphone app, and every website uses 完了 to indicate that a user-initiated process has successfully finished. When you buy something on Amazon Japan, the final screen will say 注文が完了しました (Chuumon ga kanryou shimashita - Your order is complete). When you update your iPhone, the screen will display アップデートが完了しました. When you transfer money using a banking app, you will see 振込が完了しました. It is the universal digital confirmation word. This makes it an essential 'survival word' for anyone navigating modern Japanese life, even if their spoken Japanese is limited. Recognizing the kanji 完了 can save you from accidentally repeating a payment or canceling a process prematurely.

IT and Software

Used for downloads, installations, updates, and data processing. It is the standard UI text for success states.

Business and Projects

Used in meetings, reports, and emails to signify that a task, phase, or entire project has been fully executed.

Bureaucracy and Banking

Used for paperwork, applications, identity verification, and financial transactions.

Beyond the digital realm, 完了する is a staple of the Japanese corporate environment. In business meetings, project managers will ask, あの件、完了しましたか？ (Ano ken, kanryou shimashita ka? - Has that matter been completed?). Employees will write daily reports stating 本日の業務はすべて完了しました (Honjitsu no gyoumu wa subete kanryou shimashita - All of today's tasks have been completed). In these contexts, using 完了 implies a level of thoroughness and professionalism that the simpler word 終わる lacks. It suggests that not only did the person stop working, but they also checked their work, met all requirements, and properly closed out the task. You will also hear it in automated voice announcements. For example, at a self-checkout register in a supermarket or convenience store, after you insert your cash or tap your card, the machine will often announce, お支払いが完了しました (Oshiharai ga kanryou shimashita - Payment has been completed). Similarly, ticket vending machines at train stations or automated kiosks at city halls utilize this exact phrasing.

In legal and administrative contexts, 完了する carries significant weight. When you submit paperwork for a visa, register a new address at the ward office, or file taxes, the officials will inform you when the 手続き (tetsuzuki - procedures) are 完了. Until that word is spoken or printed, the process is still pending. This highlights the definitive nature of the word. It is a binary state: something is either 未完了 (incomplete) or 完了 (complete). There is rarely a gray area when this word is applied. Understanding where and how this word is used provides deep insight into the structured, process-oriented nature of Japanese society, where following procedures to their absolute conclusion is highly valued and linguistically codified. For a language learner, recognizing this word instantly clarifies the status of whatever transaction or process they are engaged in, providing peace of mind that their task is officially done.

When learning 完了する (kanryou suru), students frequently make mistakes by confusing it with other words that mean 'to finish' or 'to complete,' most notably 終わる (owaru) and 完成する (kansei suru). Because English often uses 'finish' or 'complete' interchangeably, learners assume the same flexibility exists in Japanese. This is a critical error. The most common mistake is using 完了する for everyday, mundane activities. A learner might say 宿題が完了しました (My homework is completed) or 掃除が完了しました (The cleaning is completed). While grammatically correct, these sentences sound incredibly unnatural, overly stiff, and slightly comical to a native speaker. It sounds as though a military general is reporting on the status of a living room vacuuming operation. For daily tasks, personal chores, or simple actions, 終わる is the only natural choice: 宿題が終わりました or 掃除が終わりました. 完了する must be reserved for formal processes, administrative procedures, IT functions, and professional business tasks. It requires a context where a specific, multi-step procedure has been officially concluded.

Mistake: Using for daily chores

Incorrect: 洗濯が完了した。 Correct: 洗濯が終わった。 (Laundry is finished).

Mistake: Confusing with 完成 (Kansei)

Incorrect: 絵が完了した。 Correct: 絵が完成した。 (The painting is completed).

Mistake: Wrong particle usage

Incorrect: ダウンロードを完了した (Usually). Correct: ダウンロードが完了した。

Another major point of confusion is the difference between 完了する and 完成する (kansei suru). Both translate to 'to complete,' but they apply to entirely different concepts. 完了する is about the completion of a *process* or a *task*. 完成する is about the completion of a *product* or a *creation*. If you are building a house, writing a novel, painting a picture, or cooking a complex dish, you use 完成する when the final product is ready. You have created something new that now exists in the world. If you use 完了する in these contexts (e.g., 家が完了した), it sounds nonsensical, as if the 'concept of a house' has finished processing, rather than a physical building being built. Conversely, you cannot use 完成する for a download or a payment. ダウンロードが完成した implies that the download itself is a beautiful work of art that has just been sculpted. You must use 完了する for these invisible, procedural tasks.

Finally, learners often struggle with the transitive vs. intransitive nature of the word. Because English speakers say 'I completed the form,' they naturally want to say 私はフォームを完了しました (Watashi wa foomu o kanryou shimashita). While not strictly forbidden in all contexts, it is highly unnatural for standard communication. Japanese strongly prefers the intransitive structure for these types of administrative outcomes. The natural phrasing is フォームの入力が完了しました (Foomu no nyuuryoku ga kanryou shimashita - The inputting of the form has completed). The focus is on the state of the form, not the person who filled it out. Forcing the transitive 'を' particle onto 完了する often marks the speaker as a beginner who is directly translating English syntax into Japanese. By shifting the subject to the task itself and using 'が', learners can instantly sound much more native, professional, and attuned to the nuances of Japanese business communication.

The Japanese language is rich with vocabulary related to endings, completions, and conclusions. To truly master 完了する (kanryou suru), one must understand its position within this web of synonyms. The most fundamental synonym is 終わる (owaru), which simply means 'to end' or 'to finish.' 終わる is the universal, everyday word. A movie ends (映画が終わる), school ends (学校が終わる), and a relationship ends (関係が終わる). 完了する is a specialized, formal subset of 終わる. All things that 完了する also 終わる, but not all things that 終わる can 完了する. Another closely related term is 終了する (shuuryou suru). 終了 also means 'to end' or 'to conclude,' and it is equally formal. However, the nuance is slightly different. 完了 (kanryou) emphasizes that all required steps have been successfully executed; the task is perfectly done. 終了 (shuuryou) simply emphasizes that the allotted time or the event has come to a close, regardless of whether the internal goals were met. For example, a timed exam 終了する (ends) when the clock runs out, but your answering of the questions might not be 完了する (completed).

終わる (Owaru)

The most general word for 'to finish' or 'to end.' Used in everyday, casual conversation for almost anything.

終了する (Shuuryou suru)

Formal word for 'to end.' Focuses on the cessation of an event or time period, rather than the successful execution of steps.

完成する (Kansei suru)

Means 'to complete a product or creation.' Used for building, art, writing, and manufacturing.

Another word often encountered in similar contexts is 済む (sumu). 済む means 'to be finished,' 'to be settled,' or 'to be resolved.' It carries a strong nuance of relief—that a burden has been lifted or a troublesome task has been taken care of without issue. For example, 支払いが済む (The payment is settled). While you could say 支払いが完了する, using 済む adds a human element of 'I'm glad that's over with.' 完了する is entirely objective and robotic; it expresses no emotion, only status. Furthermore, there is 完結する (kanketsu suru), which means 'to conclude' or 'to be fully realized.' This is often used for narratives, series, or complex arguments. A manga series that publishes its final volume has 完結した. You would not use 完了する for a story, as a story is not a procedural task. Understanding these subtle boundaries is what separates an intermediate learner from an advanced speaker. It allows for precise expression of not just *that* something ended, but *how* and *why* it ended.

In highly technical or legal documents, you might also see 終結する (shuuketsu suru), which means the resolution or conclusion of a conflict, treaty, or major negotiation. This is far too grand for a simple download or registration. By comparing 完了する with 終わる, 終了する, 完成する, 済む, and 完結する, the specific identity of 完了する becomes crystal clear. It is the vocabulary of the bureaucrat, the programmer, and the project manager. It is the language of checklists being ticked off, progress bars reaching 100%, and formal requirements being satisfied. It is devoid of emotion, focused entirely on the objective reality that a predefined process has been executed perfectly from its initiation to its final, required step. Mastering this distinction ensures that your Japanese sounds not only grammatically correct but culturally and contextually appropriate in professional environments.