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Free browser-based grammar tool

Japanese Verb Conjugation Checker

Turn a dictionary-form verb into the forms you need, then use the linked guides to understand the rule behind it.

Enter a Japanese dictionary-form verb to check its polite, negative, te, past, potential, passive, causative, and volitional forms. The checker automatically recognises common Group 1, Group 2, and irregular patterns, but gives you a group override because verbs such as 帰る and 入る look like Group 2 while conjugating as Group 1. Everything runs in this browser tab.

Try a verb

Check eight useful forms

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Enter Japanese script, not romaji. For a confusing 〜る verb, set the group yourself. Try , , , or .

Choose a verb to see the table.

How the checker chooses a group

GroupFast clueExampleWhat changes
Group 1 (godan)Most verbs ending in う・く・ぐ・す・つ・ぬ・ぶ・む・る書く → 書いてThe final kana moves to a different row.
Group 2 (ichidan)Many 〜いる and 〜える verbs食べる → 食べてRemove る, then add the ending.
Group 3 (irregular)する compounds and 来る勉強する → 勉強してUse their own fixed pattern.

Important: Auto-detection cannot know every dictionary entry. Check a dictionary or use the Group 1 override for a verb such as 走る, 切る, 知る, 要る, or 帰る.

Use one verb in a complete mini-chain

Do not stop after reading the result table. Take one verb and create four short, purposeful sentences: 本を読む (dictionary), 本を読みます (polite), 本を読まない (negative), and 本を読んでください (te-form request). Conjugation becomes faster when each form has a job in a sentence.

Te-form guide and drillLearn requests, sequences, permission, and ongoing actions.Negative form guideSeparate ない, ません, and past negative patterns.Potential form guideExpress ability without confusing it with permission.Verb groups guideIdentify the pattern before memorising the ending.

5 Common Mistakes When Conjugating Japanese Verbs

  1. Assuming every 〜る verb is Group 2. 帰る becomes 帰って, not 帰て.
  2. Using potential when you mean permission. 行ける is ability; 行ってもいい is permission.
  3. Forgetting the 行く exception. Its te-form and past are 行って and 行った.
  4. Mixing passive and potential context. 食べられる needs the rest of the sentence to show whether it means ability or passive voice.
  5. Learning columns without sentences. Practise a form in one useful sentence immediately after checking it.

Frequently Asked Questions

How do I use this Japanese verb conjugation checker?

Enter a dictionary-form verb, choose Auto, Group 1, or Group 2, and select Check forms. The tool shows polite, negative, te, past, potential, passive, causative, and volitional forms.

Does the checker work with kanji verbs?

Yes. It reads the final kana in a dictionary-form verb, so 書く, 飲む, 食べる, and 勉強する work. Use a group override for a deceptive ru-ending verb when needed.

Why can a ru-ending verb need Group 1?

Some verbs ending in る are godan despite looking like ichidan verbs. Common examples include 帰る, 入る, 走る, 切る, 知る, and 要る.

Why are potential and passive identical for Group 2 verbs?

For standard Group 2 verbs, 食べられる can mean can eat or be eaten. Context, especially an agent marked by に, determines the intended meaning.

Does the tool store my verb?

No. The checker runs in the current browser page. It does not send or save your input.

What should I practise after checking a verb?

Use the related guide for the form you missed, then use that form in a short sentence rather than memorising a table alone.

Turn checked forms into reliable recall with YoruLearn

Use this checker freely whenever you need a rule. When you want a daily routine, YoruLearn turns verb forms into spaced repetition flashcards, grammar drills, and short reading practice that fit your next study session.

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