Haiku Validator
Check a haiku against the 5-7-5 pattern using a syllable heuristic.
Quick answer: enter your details below and click Check Haiku — your result appears instantly, right here in your browser. Nothing you enter is uploaded or stored.
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How to use
- Paste your three-line poem.
- Click Check Haiku.
- Recount by ear if the result is a near miss.
About this tool
Paste a three-line poem and the tool estimates syllables per line with a vowel-group heuristic and checks the 5-7-5 pattern. This is a heuristic check, not a true syllable count: English syllables are irregular, so treat near misses as worth a manual recount.
Frequently asked questions
Is the count exact?
No. It is a vowel-group heuristic, and English has many exceptions, so recount by ear for a final verdict.
Must a haiku be exactly 5-7-5?
In English practice, many haiku bend the count to preserve the image; the pattern is a guide, not a law.