Free Readability Improver

The Readability Improver is a free AI-powered tool that simplifies complex text to make it easier to read and understand for a wider audience.

Yes, it is free to use with no registration required.

The Readability Improver breaks down complex sentences, replaces difficult words with simpler alternatives, and restructures text for clarity.

Absolutely. The Readability Improver processes everything client-side in your browser. No data is uploaded to or stored on any server. Your content remains private on your device at all times.

Yes, the Readability Improver is fully responsive and works on smartphones and tablets. You can use it on any device with a modern web browser -- no app download required.

No account or registration is needed. Simply open the Readability Improver in your browser and start using it immediately. There are no sign-up walls or usage restrictions.

Simply enter your input in the provided field, adjust any settings to your preference, and the tool will process it instantly. You can then copy the result to your clipboard or download it.

The Readability Improver works in all modern browsers including Chrome, Firefox, Safari, Edge, and Opera. For the best experience, use the latest version of your preferred browser.

For most web pages and blog posts, aim for a Flesch-Kincaid grade of 8 or below, which matches the roughly 8th-grade level at which the average U.S. adult reads. On the Flesch Reading Ease scale, where higher is easier, a score of about 60 to 70 means plain, conversational English that a broad audience can skim without effort. B2B whitepapers and technical docs can sit a little higher, around grade 10 to 12, but going beyond that quietly loses readers who could have understood a clearer version. The Readability Improver scores your text on Flesch-Kincaid, Flesch Reading Ease, Gunning Fog, and SMOG at once, so you are not trusting a single number. Paste a passage to see exactly where it lands and which grade level it maps to.

Both estimate the U.S. school grade a reader needs, but they weigh complexity differently. Flesch-Kincaid Grade Level is driven by average sentence length and average syllables per word, so it reacts strongly to long sentences and multi-syllable vocabulary. The Gunning Fog Index instead counts "complex" words, meaning those of three or more syllables, alongside sentence length, so a short sentence stuffed with jargon cannot quietly pass as easy. In practice the two scores usually land close together, but Fog tends to flag dense, technical writing more harshly. Reading both, plus the SMOG Index, gives a more honest picture than relying on one formula. The Readability Improver calculates all of them side by side for the same text, so you can spot whether sentence length or word difficulty is your real problem, then rewrite accordingly.

It does two main things, and how aggressively depends on the target grade you pick (5, 6, 8, 10, or 12). First, word swaps: a dictionary of hundreds of complex-to-simple pairs replaces heavier vocabulary with everyday alternatives, so "utilize" becomes "use" and "consecutive" becomes "in a row." A grade-5 target applies these far more aggressively than a grade-12 target. Second, sentence splitting: long sentences are broken at natural joining words such as and, but, however, because, and although, and the maximum sentence length scales with your target, so a grade-5 goal caps sentences much shorter than grade 12. The original and rewritten versions sit side by side with a before-and-after score panel. Treat the result as a strong first draft and read it through, since automated edits can occasionally shift emphasis.

Plain writing is not about dumbing ideas down; it is about not making readers work harder than they need to. The average U.S. adult reads at roughly an 8th-grade level, and on screens people skim rather than read every word, so a page written at college level sheds readers who could have followed a clearer version. Lower reading difficulty is linked to better comprehension and longer time on page, which matters for SEO and conversions. Help docs and policy pages especially benefit, because dense instructions that customers cannot parse generate support tickets. The Readability Improver shows exactly how many grade levels easier your rewrite becomes, plus shifts in sentence length, complex-word percentage, and reading time. Paste a paragraph, choose a target grade, and you can see whether the change is meaningful before you publish.

In most readability formulas, a complex or "polysyllabic" word is one with three or more syllables, like "opportunity" or "implementation." These words pull grade-level scores up because the Gunning Fog and SMOG formulas specifically count them, and Flesch-Kincaid penalizes high average syllables per word. Common short words and proper nouns are usually excluded from the harshest weighting, but the general rule of thumb is the three-syllable threshold. The Readability Improver reports the percentage of complex words in your text and average syllables per word as supporting stats, then highlights heavy vocabulary you can replace. It also flags passive voice, adverbs, and overly long sentences as a checklist. Paste your draft to see your complex-word percentage and which specific words are dragging the score higher than it needs to be.