開封する · noun or participle which takes 'suru'
| Form | Positive | Negative |
|---|---|---|
| Dictionary | 開封する | 開封しない |
| Polite | 開封します | 開封しません |
| Past polite | 開封しました | 開封しませんでした |
| Past | 開封した | 開封しなかった |
| Te-form | 開封して | 開封しないで |
| Desire | 開封したい | 開封したくない |
| Potential | 開封できる | 開封できない |
| Passive | 開封される | 開封されない |
| Causative | 開封させる | 開封させない |
| Causative passive | 開封させられる | 開封させられない |
| Volitional | 開封しよう | |
| Polite volitional | 開封しましょう | |
| Imperative | 開封しろ | 開封するな |
| Conditional | 開封すれば | 開封しなければ |
| Tara conditional | 開封したら | 開封しなかったら |
noun, noun or participle which takes 'suru', transitive verb
opening; breaking the seal
Used for opening something that has been sealed or closed, especially letters, envelopes, parcels, official documents, or packages. As a suru verb, the object is marked with を.
Before opening the envelope, please check the addressee.
This document must not be opened by anyone other than the person concerned.
noun, noun or participle which takes 'suru', transitive verb
unboxing; opening a product package
A product-focused extension, common for newly bought goods and online content such as 開封動画. It emphasizes opening the packaging for the first time rather than merely opening a container.
I unboxed the new smartphone as soon as I got home.
She posts unboxing videos of cosmetics.
unsealed mail
A limited postal or administrative noun use referring to mail that is not sealed or is treated as open. In ordinary conversation, people usually describe the state more explicitly, such as 封をしていない郵便物.
In postal explanations, 開封 can refer to mail that is not sealed.
I opened the package as soon as it arrived.
Please eat it soon after opening.
This package had already been opened.
I uploaded an unboxing video of the new game console.
The mail arrived unsealed.
包装 is the act of wrapping or sealing something, while 開封 is the act of unwrapping or opening a sealed package.
開封 means to break a seal and open something, the direct opposite of 封印, which means to seal it shut.