Readability Checker
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Evaluate how easy your content is to read using multiple established scoring algorithms. The tool calculates the Flesch Reading Ease score, Flesch-Kincaid Grade Level, Gunning Fog Index, SMOG Index, and Automated Readability Index simultaneously. Beyond the scores, it highlights specific difficulty factors: long sentences that should be broken up, complex vocabulary, passive voice overuse, and excessively long paragraphs. Average sentence length, average word length, and the percentage of complex words are also shown. Each metric includes practical guidance for improvement. All analysis runs instantly in your browser with no server upload. No account required.
How to Use
- 1Paste your article or content into the text area
- 2Click Analyze - all readability scores are calculated instantly
- 3Review the Flesch Reading Ease score and grade level
- 4Check the highlighted difficult sentences (shown in orange or red) to see which ones to simplify
- 5Review the word and sentence statistics: average sentence length, average syllables per word
- 6Edit your text to shorten long sentences and replace complex words, then re-analyze to see the improvement
Features
- Flesch Reading Ease score (0–100)
- Flesch-Kincaid Grade Level
- Gunning Fog Index
- SMOG Index, Coleman-Liau Index, Automated Readability Index
- Sentence-level difficulty highlighting (orange/red for hard sentences)
- Average sentence length and average syllables per word
- Word, sentence, and paragraph count
- 100% browser-based - no text uploaded
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