Content Readability Score Checker

About this tool

Free Content Readability Score Checker

Check Content Readability and Reading Grade Online The WebToolsEdge Content Readability Score Checker analyzes English prose with six established readability formulas: Flesch Reading Ease, Flesch-Kincaid Grade Level, Gunning Fog Index, SMOG Index, Coleman-Liau Index, and Automated Readability Index (ARI). Paste content, open a supported text file, or fetch readable text from a public webpage URL to compare formula scores and review sentence-level writing signals. What a Readability Score Means A readability score estimates how difficult written material may be for a reader. Some formulas focus on sentence length and syllables, while others use character counts or the proportion of complex words. Because formulas measure different signals, the tool shows every score separately and creates a composite US grade-level estimate instead of presenting one formula as unquestionable truth. Flesch Reading Ease uses a 0-to-100 scale where a higher result generally indicates easier English prose. Flesch-Kincaid, Gunning Fog, SMOG, Coleman-Liau, and ARI express results as approximate US school grade levels. A grade of 8 suggests that the writing may be approachable for many readers around an eighth-grade reading level; it does not identify a reader's intelligence, age, or education. Readability Formulas Included Flesch Reading Ease considers average sentence length and average syllables per word. Flesch-Kincaid converts similar inputs into a grade-level estimate. Gunning Fog gives additional weight to words with three or more syllables. SMOG was designed around polysyllabic words and is often used for longer samples. Coleman-Liau uses letters and sentences per 100 words, while ARI relies on characters per word and words per sentence. Results are more stable with several complete paragraphs than with a headline or one short sentence. Names, technical terminology, abbreviations, numbers, and unusual punctuation can also affect a formula. Compare the range, then use editorial judgment. Sentence Difficulty and Writing Pattern Checks The checker highlights sentences that are longer than 25 words or contain several complex words. It also flags possible passive constructions and -ly adverbs. These checks are heuristics, not grammar verdicts. Passive voice can be useful when the actor is unknown or when the action matters more than the actor. An adverb may be exactly the right word. The purpose of each flag is to focus review, not force every sentence into one style. The difficult-word list uses syllable estimates and includes simple replacement ideas for a limited set of common terms. Replace a word only when the alternative preserves accuracy and tone. Technical, legal, medical, and academic writing may require vocabulary that increases a readability grade but remains essential for its audience. Choose a Target Audience Select children, general public, professional, technical, or academic readers to compare the composite grade with a useful target range. General web content often benefits from concise sentences and familiar language, but there is no universal ideal score. A technical guide should prioritize precise instructions, while children's content needs substantially simpler syntax and vocabulary. For supporting content checks, use the Word Counter to review length and pacing, the Keyword Density Checker to spot repeated search phrases, and Find and Replace Text Online to make consistent revisions. Text Space Cleaner can remove accidental spacing before the final readability review. Privacy and URL Analysis Pasted content and uploaded TXT, Markdown, HTML, or CSV files are analyzed inside the current browser tab. URL mode is different: the public URL is sent to the WebToolsEdge server so readable page text can be fetched securely. Login-protected, oversized, non-HTML, blocked, or JavaScript-only pages may not return usable text. WebToolsEdge does not need URL mode when you paste the page copy directly. How to Improve a Readability Score Without Weakening Content Start with the sentences marked as long or difficult. Split ideas where a sentence contains more than one independent point. Replace vague phrases with direct verbs, define specialist terms on first use, and use headings or lists when they help readers scan a process. Keep necessary detail and evidence. A lower grade is not automatically better if simplification removes important meaning. After editing, save the current result as a baseline and compare the new grade and Flesch Reading Ease. The before-and-after view makes it easier to see whether a revision changed measurable complexity, while the sentence feedback helps confirm whether the revised prose actually reads more clearly. Readability Checker Limitations Readability formulas do not measure factual accuracy, originality, search intent, logical organization, tone, accessibility, persuasion, or whether a reader understands the subject. They also do not replace proofreading, user testing, or a professional editor. Full formula scoring is limited to English because syllable and sentence rules differ by language. Other-language mode intentionally shows only basic word, sentence, paragraph, and character metrics rather than a misleading English readability score.