Readability Checker

Clear writing gets read; dense writing gets skimmed. Paste your text and this scores its readability (Flesch Reading Ease) and shows where it's getting heavy — so you can simplify before you publish.

Free vs paid — when to upgrade

What this free tool is great for: a quick, one-off job with no signup — it runs entirely in your browser, so nothing leaves your device and there's nothing to manage.

Its honest limit: it checks or generates one thing in your browser — it won't track rankings over time, monitor changes across many pages, or optimise at scale.

Where QuillBot does more: Spotting hard sentences is one thing; rewriting them is another. A tool like QuillBot paraphrases, shortens and clarifies text for you.

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Readability is a business metric, not a nicety

Clear writing gets read; dense writing gets skimmed and abandoned. On the web that isn't a matter of taste — it shows up in the numbers. A visitor who has to re-read a sentence to understand it is a visitor deciding whether to bounce. Whether you're writing a landing page, a sales email, a help article or a blog post, the easier it is to follow, the further people get, and the more of them take the action you wanted. Readability is the quiet multiplier on everything else you write, which is why it deserves a score rather than a shrug.

What the score actually measures

Most readability scores, including the Flesch family this tool uses, are built from two simple ingredients: how long your sentences are, and how many syllables your words carry. Short sentences and plain words produce an easy score; long sentences packed with multi-syllable words produce a hard one. Flesch Reading Ease runs from 0 to 100, where higher means easier — a score in the 60s to 70s is comfortable for a general audience. The grade-level version translates the same maths into school years, so "grade 8" means a typical thirteen-year-old could read it without friction. Neither is magic; they're proxies. But they're proxies that correlate well with how much effort a reader has to spend.

The grade level the web actually wants

People are often surprised by how low the target is. Aiming for around grade 7 to 9 isn't dumbing down — it's respecting that your reader is busy, possibly on a phone, possibly reading in a second language, and definitely not giving you their full attention. Some of the most respected publications in the world write at roughly this level on purpose. Simple prose isn't a sign of simple thinking; it's the harder discipline of making complex ideas effortless to absorb. The goal isn't a childish page, it's a frictionless one.

What actually makes writing hard

Because the score keys off sentence length and syllables, the fixes are concrete. Long, winding sentences that stack three clauses together are the number-one culprit — breaking one into two usually lifts the score and the clarity at once. Needlessly fancy words are the second: "use" beats "utilise," "help" beats "facilitate," "buy" beats "purchase." Jargon and acronyms force the reader to translate as they go. And the passive voice ("mistakes were made") quietly adds words and drains energy compared with the active voice ("we made mistakes"). None of these require talent to fix — only attention, which is exactly what a score directs.

How to rewrite a dense paragraph

When the checker flags a hard passage, work in passes rather than agonising over every word at once. First pass: split the longest sentences at their natural joints — usually a comma before "and," "but," or "which." Second pass: hunt for the longest words and ask whether a plainer one carries the same meaning; most of the time it does. Third pass: flip obvious passive constructions into active ones and cut the throat-clearing phrases ("it is important to note that," "in order to"). Read it aloud at the end — anywhere you stumble or run out of breath is a sentence that's still too long. This loop reliably moves a paragraph two or three grade levels without losing a single idea.

Readability is not the whole story

A perfect score doesn't guarantee good writing, and it's honest to say so. You can hit grade 5 with prose that's clear but boring, or technically simple but structurally a mess. The score can't judge whether your argument holds, whether your examples land, or whether the piece is worth reading at all. Treat it as a smoke detector, not a food critic: a bad score reliably tells you something is hard to read, but a good score only tells you the sentences are short — the ideas still have to be worth the reader's time. Use the number to remove friction, then use your judgement to add value.

The SEO and conversion angle

Search engines don't hand out ranking points for a Flesch score, so ignore anyone who promises that. What readability does is improve the human signals that matter: people stay longer, read more, and are likelier to link to or share content they actually finished. On a landing page the effect is even more direct — a clear headline and scannable body lift conversions because fewer people give up before reaching the call to action. Readability doesn't game the algorithm; it wins the reader, and winning the reader is what the algorithm is ultimately trying to reward.

Match the target to the audience and format

There's no single right score, because the right level depends on who's reading and why. A consumer landing page or a broad blog post should aim easy — grade 7 to 9 — because the audience is wide, distracted and skimming. Technical documentation written for engineers can run higher, since precise terms carry meaning that plainer words would blur, and the reader expects density. A legal or medical page has its own constraints. The mistake isn't writing above grade 9; it's writing above your audience's comfort without a reason. Format matters too: bullet points, short paragraphs, subheadings and white space all make a page feel easier to read regardless of its raw score, so structure your writing as deliberately as you word it. Use the number as a guide calibrated to your reader, not as a universal law.

Spotting hard writing vs fixing it — where QuillBot does more

This checker is excellent at diagnosis: it tells you, sentence by sentence, where a reader will struggle. Rewriting is a separate skill, and it's the slow part — especially when you're staring at your own prose and can no longer see why it's clunky. That's where an AI writing assistant like QuillBot earns its place: it paraphrases tangled sentences, shortens the bloated ones, and offers plainer phrasings you can accept or reject. The free checker shows you exactly what to fix and holds you to a target; a paraphrasing tool helps you do the fixing faster when the words won't come. Diagnose here, then rewrite with help — and re-run the score to confirm you actually moved it.

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