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Readability Checker | Spot long sentences, dense paragraphs, and repeated phrasing
Paste text to check sentence length, paragraph density, repeated wording, line-break density, and mobile readability signals in your browser.
Enter text to check sentence length, paragraph density, and repeated wording.
Input stays in your browser and is limited to 12,000 characters. Thresholds are clamped to 20-120 characters and 2-12 lines.
Why use a readability checker?
A text can be correct and still feel tiring to read. That usually happens when sentences get too long, paragraphs become dense, or the same phrasing keeps repeating.
That is especially common when:
- a notice or policy update packs several conditions into one sentence
- a blog draft was written in one flow and has weak paragraph breaks
- an email or proposal repeats the same wording until it feels heavy
- the facts are all there, but the reader has to reread to understand them
This tool gives you a fast editing pass in the browser by showing:
- character count
- sentence count
- average sentence length
- number of long sentences
- number of long paragraphs
- repeated wording patterns
- line-break density
- a quick readability label
For mobile notices, blog posts, application drafts, and newsletters, even one overly long paragraph can feel like a wall of text on a small screen. Running a quick check before publishing makes it easier to decide where to split sentences and paragraphs.
Selection note for this improvement
Recent quality passes focused on time-difference-calculator, korean-name-romanizer, png-compressor, json-merge, and link-list-cleaner, so this pass avoided repeating those tools. readability-checker had higher text-processing risk around long input, sentence splitting, repeated terms, mobile paragraph density, and localized UI labels, so it was selected for today.
How to use it
- Paste your draft.
- Adjust the long-sentence and long-paragraph thresholds if needed.
- Review the long sentence count, dense paragraph count, and repeated wording list.
- Use the suggestions to split crowded sentences or reorganize paragraphs.
The result area helps you scan:
- total characters and sentence count
- average sentence length
- sentences over your chosen threshold
- paragraphs over your chosen line threshold
- repeated wording candidates
- a short readability comment
Especially useful for these cases
1) Notices and internal announcements
Long condition-heavy sentences often make instructions harder to follow. A quick check helps you separate conditions, exceptions, and next steps before posting.
2) Blog drafts and newsletters
Early drafts tend to follow the writer’s thought flow. Finding long sentences and dense paragraphs first makes the final read much smoother.
3) Emails, proposals, and work documents
Work writing needs to be understood quickly. This is useful when the goal is a first-read explanation, not just a technically correct paragraph.
4) Essays and application drafts
Strong content can still feel heavy if every sentence is long. Use the signals to add breathing points before final polishing.
Examples
Example 1) Checking an internal notice
- Pasted text: remote-work request instructions
- Long sentence threshold: 45 characters
- Dense paragraph threshold: 4 lines
This helps you split sentences that carry too many conditions and separate exceptions into their own paragraph.
Example 2) Checking a blog draft
- Pasted text: 900-character product review draft
- Long sentence threshold: 50 characters
- Dense paragraph threshold: 5 lines
This helps you spot repeated wording and paragraphs that may feel too dense before publishing.
Edge cases to check
- Empty input keeps a clear idle state.
- Very short text shows a gentle warning instead of a false strong judgment.
- Thresholds outside the supported range are clamped to 20-120 characters and 2-12 lines.
- Repeated terms are escaped before rendering, so pasted markup is shown as text instead of HTML.
Related tools
- For raw length checks: Text Counter
- For case cleanup in titles or labels: Case Converter
- For structured meeting text drafts: Meeting Agenda Generator
FAQ
How is the readability label decided?
It combines sentence length, paragraph length, repeated wording, and line-break density into a lightweight estimate of likely reading burden. It is an editing signal, not an absolute writing grade.
Can I paste non-Korean writing?
Yes. The checker is tuned around Korean sentence flow, so English-only or Japanese-only long text can be rougher, but it is still useful for catching length, density, and repetition patterns.
What happens if thresholds are too small or too large?
The long-sentence threshold is clamped to 20-120 characters, and the dense-paragraph threshold is clamped to 2-12 lines so unusual values do not break the result.
Can I paste private documents?
The check runs in your browser, but sensitive writing still deserves care. Remove names, contacts, account details, and other personal information whenever possible before pasting.
Summary
This readability checker is not a grammar judge. It is a fast editing aid that helps you find where text may feel crowded, repetitive, or harder to scan.