Content Readability Checker — Free
Check reading level, sentence complexity, and readability score of any text.
Features
- ✓Flesch Reading Ease score (0–100)
- ✓Flesch-Kincaid Grade Level
- ✓Word count, sentence count, and average words per sentence
- ✓Color-coded verdicts: Easy / Medium / Hard
Benefits
- →Write ad copy at the grade level that converts (Grade 6–8)
- →Reduce cognitive load on your landing pages to improve conversion rate
- →Catch bloated sentence structures before they kill engagement
- →Benchmark copy readability across your team for consistency
How to Use This Tool
- 1
Paste your ad copy, landing page text, or email body into the text area.
- 2
Hit Check Readability to see your scores.
- 3
Aim for a Flesch score above 60 and a grade level below 9 for best results in D2C and performance marketing contexts.
What is Content Readability?
Readability measures how easy your text is to understand. The Flesch Reading Ease formula — developed by Rudolf Flesch in 1948 — scores text from 0 to 100 based on average sentence length and syllable count. A score of 60–70 is considered easy to read by most adults. The Flesch-Kincaid Grade Level converts this to a US school grade equivalent: Grade 8 means an 8th grader can understand it.
Why It Matters
Ad copy and landing pages written at a Grade 6–8 level consistently outperform more complex text. Simple, clear language reduces cognitive load and increases the likelihood that readers will act. The best-performing direct response copy — from decades of testing — reads at roughly a 6th grade level. This doesn't mean dumbing down your message; it means removing unnecessary complexity.