• Basic forms
• 閉じる — close / base form
• 閉じます — close / masu form
• 閉じた — closed / ta form
• 閉じて — closing … / te form
• 閉じない — do not close / negative
• 閉じれば — if (someone) closes / conditional
• Common expressions
• 目を閉じる — close one’s eyes
• 本を閉じる — close a book

閉じる（とじる） is an ichidan verb. It is often used for abstract or non-mechanical objects, such as eyes, books, notebooks, or files.

• Basic forms
• 閉める — shut; close / base form
• 閉めます — shut / masu form
• 閉めた — shut / ta form
• 閉めて — shutting … / te form
• 閉めない — do not shut / negative
• 閉めれば — if (someone) shuts / conditional
• Common expressions
• ドアを閉める — close a door
• 窓を閉める — close a window

閉める（しめる） is an ichidan transitive verb. It is mainly used for physical objects such as doors, windows, lids, or bags.