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Analyze text readability with Flesch-Kincaid, Gunning Fog, SMOG, and Coleman-Liau scores. Optimize your writing for any audience.
About this tool
Analyze text readability with Flesch-Kincaid, Gunning Fog, SMOG, and Coleman-Liau scores. Optimize your writing for any audience.
Readability Checker is a free text tool that runs entirely in your browser — nothing to install, no account to create, and your data never leaves your device. Open the page, add your input, and get a clean, copy-ready result in seconds.
Open Readability Checker on AltFTool — it loads instantly in your browser.
Paste or type the text you're working with.
Choose how it should be transformed or analyzed.
Copy the finished text into your document or post.
Clean up, transform, or analyze your writing without leaving the browser.
Get output shaped precisely for your document, post, or platform requirements.
Copy the finished text straight into emails, docs, code, or social posts.
Yes — Readability Checker is completely free on AltFTool, with no signup, no trial limits, and no hidden costs.
Yes. Readability Checker runs in your browser, so what you enter or upload stays on your device instead of being sent to a server.
Analyze text readability with Flesch-Kincaid, Gunning Fog, SMOG, and Coleman-Liau scores. Optimize your writing for any audience. It's built for quick, everyday text tasks with results you can copy or download straight away.
Yes — Readability Checker works in any modern browser, on desktop, tablet, and mobile, with the same features everywhere.