Free browser-based tools

Readability Tools

Readability, sentence length, passive voice, paragraph, reading level, and plain English writing checks. Built for writers, editors, marketers, teachers, students, and documentation teams.

32 tools4 guidesNo sign-upRuns in browser

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Open a tool directly. Each page includes inputs, examples, notes, and copy-ready results.

Readability Score Calculator

Estimate Flesch reading ease and grade level. Structure

Sentence Length Checker

Find average and longest sentence length. Editing

Passive Voice Highlighter

Estimate passive voice patterns using common be-verb signals. Structure

Paragraph Length Checker

Check paragraph word counts and long paragraph risk. Scores

Reading Level Estimator

Estimate reading level from sentence and word complexity. Editing

Plain English Checker

Flag long words, long sentences, and complex wording. Timing

Reading Time Calculator

Estimate reading and speaking time. Scores

Keyword Frequency Checker

Count keyword frequency and density. Editing

Duplicate Word Checker

Find repeated adjacent words. Scores

Syllable Estimator

Estimate syllables in text. Structure

Summary Length Checker

Check whether a summary fits a target length. Editing

Transition Word Checker

Count common transition words. Scores

Word Count Checker

Count words and readability signals for drafts, posts, and documentation. Structure

Long Sentence Checker

Find average and longest sentence length to improve scan-friendly writing. Timing

Blog Reading Time Calculator

Estimate reading and speaking time for articles, posts, and scripts. Structure

Meta Summary Length Checker

Check whether a short summary fits a target character length. Scores

Keyword Density Checker

Count exact keyword frequency and density in a text sample. Editing

Plain Language Checker

Flag long words and estimate average word length for clearer writing. Editing

Repeated Word Finder

Find repeated adjacent words that often slip into drafts. Structure

Paragraph Word Count Checker

Check paragraph count, longest paragraph length, and long paragraph risk. Scores

Advanced Readability Score Calculator

Estimate Flesch reading ease and grade level. Use this focused variant for advanced workflows and long-tail search scenarios. Structure

Quick Sentence Length Checker

Find average and longest sentence length. Use this focused variant for quick workflows and long-tail search scenarios. Editing

Planning Passive Voice Highlighter

Estimate passive voice patterns using common be-verb signals. Use this focused variant for planning workflows and long-tail search scenarios. Structure

Mobile Paragraph Length Checker

Check paragraph word counts and long paragraph risk. Use this focused variant for mobile workflows and long-tail search scenarios. Scores

Small Business Reading Level Estimator

Estimate reading level from sentence and word complexity. Use this focused variant for small business workflows and long-tail search scenarios. Editing

Creator Plain English Checker

Flag long words, long sentences, and complex wording. Use this focused variant for creator workflows and long-tail search scenarios. Timing

Student Reading Time Calculator

Estimate reading and speaking time. Use this focused variant for student workflows and long-tail search scenarios. Scores

Team Keyword Frequency Checker

Count keyword frequency and density. Use this focused variant for team workflows and long-tail search scenarios. Editing

Audit Duplicate Word Checker

Find repeated adjacent words. Use this focused variant for audit workflows and long-tail search scenarios. Scores

Checklist Syllable Estimator

Estimate syllables in text. Use this focused variant for checklist workflows and long-tail search scenarios. Structure

Campaign Summary Length Checker

Check whether a summary fits a target length. Use this focused variant for campaign workflows and long-tail search scenarios. Editing

Batch Transition Word Checker

Count common transition words. Use this focused variant for batch workflows and long-tail search scenarios.

Scores

Scores

Focused tools for common readability tools workflows.

Readability Score Calculator

Estimate Flesch reading ease and grade level. Scores

Reading Level Estimator

Estimate reading level from sentence and word complexity. Scores

Keyword Frequency Checker

Count keyword frequency and density. Scores

Syllable Estimator

Estimate syllables in text. Scores

Word Count Checker

Count words and readability signals for drafts, posts, and documentation. Scores

Keyword Density Checker

Count exact keyword frequency and density in a text sample. Scores

Advanced Readability Score Calculator

Estimate Flesch reading ease and grade level. Use this focused variant for advanced workflows and long-tail search scenarios. Scores

Small Business Reading Level Estimator

Estimate reading level from sentence and word complexity. Use this focused variant for small business workflows and long-tail search scenarios. Scores

Team Keyword Frequency Checker

Count keyword frequency and density. Use this focused variant for team workflows and long-tail search scenarios. Scores

Checklist Syllable Estimator

Estimate syllables in text. Use this focused variant for checklist workflows and long-tail search scenarios.

Structure

Structure

Focused tools for common readability tools workflows.

Sentence Length Checker

Find average and longest sentence length. Structure

Paragraph Length Checker

Check paragraph word counts and long paragraph risk. Structure

Summary Length Checker

Check whether a summary fits a target length. Structure

Long Sentence Checker

Find average and longest sentence length to improve scan-friendly writing. Structure

Meta Summary Length Checker

Check whether a short summary fits a target character length. Structure

Paragraph Word Count Checker

Check paragraph count, longest paragraph length, and long paragraph risk. Structure

Quick Sentence Length Checker

Find average and longest sentence length. Use this focused variant for quick workflows and long-tail search scenarios. Structure

Mobile Paragraph Length Checker

Check paragraph word counts and long paragraph risk. Use this focused variant for mobile workflows and long-tail search scenarios. Structure

Campaign Summary Length Checker

Check whether a summary fits a target length. Use this focused variant for campaign workflows and long-tail search scenarios.

Editing

Editing

Focused tools for common readability tools workflows.

Passive Voice Highlighter

Estimate passive voice patterns using common be-verb signals. Editing

Plain English Checker

Flag long words, long sentences, and complex wording. Editing

Duplicate Word Checker

Find repeated adjacent words. Editing

Transition Word Checker

Count common transition words. Editing

Plain Language Checker

Flag long words and estimate average word length for clearer writing. Editing

Repeated Word Finder

Find repeated adjacent words that often slip into drafts. Editing

Planning Passive Voice Highlighter

Estimate passive voice patterns using common be-verb signals. Use this focused variant for planning workflows and long-tail search scenarios. Editing

Creator Plain English Checker

Flag long words, long sentences, and complex wording. Use this focused variant for creator workflows and long-tail search scenarios. Editing

Audit Duplicate Word Checker

Find repeated adjacent words. Use this focused variant for audit workflows and long-tail search scenarios. Editing

Batch Transition Word Checker

Count common transition words. Use this focused variant for batch workflows and long-tail search scenarios.

Timing

Timing

Focused tools for common readability tools workflows.

Reading Time Calculator

Estimate reading and speaking time. Timing

Blog Reading Time Calculator

Estimate reading and speaking time for articles, posts, and scripts. Timing

Student Reading Time Calculator

Estimate reading and speaking time. Use this focused variant for student workflows and long-tail search scenarios.

Guides

Use the tools well

Short guides for practical workflows and review habits.

How to use readability tools effectively

A practical workflow for choosing and combining readability tools. Guide

Quality checks for readability tools

How to review inputs, outputs, edge cases, and assumptions. Guide

Why browser-based tools are useful

Privacy, speed, and limitations of client-side tools. Guide

Readability Tools checklist

A simple checklist for choosing the right tool.