Readability Checker

Get your Flesch score, grade level, and your hardest sentences — highlighted instantly.

What this tool does

The Readability Checker analyzes any text and returns its Flesch Reading Ease score, estimated US grade level, average sentence length, average syllables per word, and the percentage of long sentences — then lists your longest, hardest sentences so you know exactly which ones to break up. Scores update instantly as you edit, so you can fix and re-check in a tight loop.

Readability is quietly one of the highest-leverage edits you can make. Most successful web content sits between grade 7 and grade 9 — not because readers aren't smart, but because everyone, including experts, prefers writing that doesn't make them work for it. Content that's easier to read gets read further, shared more, and quoted more often; long, tangled sentences are where skimmers give up.

Everything is computed locally in your browser — no signup, no word limits, and your text never leaves the page. Run your draft through it before publishing, break up whatever gets flagged, and watch the score climb. For readability guidance that follows you through an entire article as you write, SirWritesALot's editor scores every draft live.

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