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Readability Test Tool & Text Difficulty Analyzer

Check reading level with Flesch Reading Ease, Flesch–Kincaid Grade, Fog, Coleman–Liau, SMOG, and ARI. Highlight long sentences, passive voice, and -ly adverbs, then export a report or per-sentence CSV. Everything runs locally in your browser.

Flesch Reading Ease
22.6

Score out of 100. Higher is better. 60–70 is easily understood by most adults.

Flesch-Kincaid Grade
14.4

Corresponds to a U.S. school grade level. Aim for ~8.0 for general audiences.

Gunning Fog Index
17.9

Estimates the years of formal education needed to understand the text easily.

Coleman-Liau Index
17.3

Grade level index that relies on character count rather than syllables.

SMOG Index
15.6

Grade level estimate based on polysyllabic word frequency.

Automated Readability Index
15.1

Grade level using characters per word and words per sentence.

Enter Your Text

Analysis & Highlighting

words
2 of 4 sentences are easy to read.
1 of 4 sentences are difficult to read.
1 of 4 sentences are very difficult to read.

Basic Stats

Words
69
Sentences
4
Chars (no space)
409
Complex words
19
Avg words/sent
17.25
Syllables/word
1.97
Read time
0:21
Speak time
0:32

Sentences That May Need Attention

3 flagged
  • #2Passive8 wordsgrade≈8.2

    It is designed for writers, developers, and students.

  • #31 adverb(s)19 wordsgrade≈12.3

    Our tools are powerful, easy to use, and respect your privacy by performing all operations directly in your browser.

    Adverbs: directly

  • #4LongPassiveVery hard2 adverb(s)29 wordsgrade≈23.4

    This final sentence is deliberately fabricated to be extraordinarily hard to read, utilizing polysyllabic words and a convoluted grammatical structure to demonstrate the highlighting functionality for very difficult passages.

    Adverbs: deliberately, extraordinarily

Top Keywords (excluding stopwords)

WordCountDensity
text22.9%
suite22.9%
tools22.9%
tool11.45%
comprehensive11.45%
free11.45%
online11.45%
manipulation11.45%
designed11.45%
writers11.45%
TL;DR — paste text, get readability scores, fix the hard bits

Check reading level with Flesch Reading Ease, Flesch–Kincaid, Gunning Fog, Coleman–Liau, SMOG, and ARI. See long or difficult sentences, passive voice, and adverbs, then export a report or per‑sentence CSV. Everything runs in your browser.

Readability Test Tool – Flesch, Fog, Grade Level & Reading Score Checker

Check the readability of your text online with six readability scores: Flesch Reading Ease, Flesch–Kincaid Grade Level, Gunning Fog, Coleman–Liau, SMOG, and ARI. Highlights hard sentences, passive voice, and adverbs.

This fast, privacy‑friendly readability checker runs locally — paste your text or drop a .txt or .md file and nothing is uploaded.

Beyond numbers, the editor highlights sentence difficulty (easy / hard / very hard), underlines passive voice, tints -ly adverbs, and flags long sentences (you choose the threshold). You also get keyword frequency and density (stopwords excluded), estimated read & speak time, and a "sentences that may need attention" list for quick fixes.

Tidying a draft? Pair this with Text Cleaner and Advanced Word Counter. Together they cover cleanup, counts, and readability scoring from one place.

What readability score should your content target?

  • General blog / web content: Flesch 60–70, Grade 7–9. Comfortable for most adult readers.
  • Technical documentation: Grade 10–12. Higher complexity is acceptable when the audience is expert.
  • Children's content: Grade 4–6 with a high Flesch Reading Ease score (70+).

The right level depends on your audience — these are targets, not strict rules.

Quick start

  1. Paste your text (or drop a .txt/.md file) into the editor.
  2. Check the cards for Flesch Reading Ease, Flesch–Kincaid Grade, Gunning Fog, Coleman–Liau, SMOG, and ARI.
  3. Toggle highlights for long sentences, passive voice, and -ly adverbs. Adjust the "long" threshold if needed.
  4. See counts, read/speak time, and keyword density in the side panel. Copy a text report or export per‑sentence CSV when you’re done.

Key features

  • Flesch Reading Ease & Flesch–Kincaid Grade
  • Gunning Fog, Coleman–Liau, SMOG, and ARI
  • Highlights for long/difficult sentences, passive voice, and -ly adverbs
  • Custom long‑sentence threshold
  • Word, sentence, and character counts; average W/S and syllables/word
  • Estimated read time and speak time
  • Keyword frequency & density (stopwords excluded)
  • Per‑sentence CSV export and shareable text report
  • Drag & drop .txt/.md, one‑click copy
  • 100% client‑side — no tracking or uploads

Tips

  • For general audiences, aim for Flesch 60–70 or roughly Grade 8–10.
  • Prefer active voice and concrete verbs; cut filler adverbs.
  • Split very long sentences; trim stacked prepositional phrases.
  • Use shorter words when meaning stays the same.
  • Re‑check after edits — scores move with structure and word choice.

Frequently asked questions

What is a good Flesch Reading Ease score?
Higher is easier. A score around 60–70 is broadly readable; technical docs often land lower.
How is this different from a Fry readability test?
Fry uses a plotted graph on passages. This tool computes formula‑based indices (Flesch, FK, Fog, Coleman–Liau, SMOG, ARI) for instant results.
Why do scores vary between tools?
Tokenization, syllable rules, rounding, and sentence splitting differ between implementations. Use trends, not one-off numbers.
Is passive‑voice detection exact?
It’s heuristic—use it to spot candidates for revision, not as a strict grammar rule.
Is my text private?
Yes—everything runs locally in your browser; nothing is uploaded.
How do I check the reading level of my text online?
Paste your text and the tool instantly shows six readability scores including Flesch Reading Ease, Flesch-Kincaid Grade Level, and Gunning Fog Index. No account needed.
What grade level should blog content target?
Most general blog content reads best at Grade 7–9 (Flesch-Kincaid), which corresponds to a Flesch Reading Ease score of 60–70 — comfortable and accessible for most adult readers.
How do I calculate the Gunning Fog Index for my text?
Paste your text into the readability checker. The Gunning Fog Index is calculated automatically based on sentence length and the percentage of complex words (3+ syllables).

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