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Why this runs on your computer

There is no upload: The work happens in this tab. Your file never travels, so there is no copy of it anywhere but your own disk.
Nothing to delete later: Sites that upload promise to delete your file afterwards. That promise only matters because the file was theirs to hold.
It works with the Wi-Fi off: The honest test. Turn off your connection and the tools keep working, because everything they need is already here.

Text analyzer: frequency, readability and hidden characters

Look inside a text: frequency, readability and hidden characters - here in this tab, with nothing uploaded.

How to text analyzer

Paste your text.
Read the frequency table, readability score and sentence lengths.
Check the invisible characters and strip them if you need to.

Why this one stays private

Analysing a text means reading all of it. Here your browser does the reading, and nothing is sent anywhere.

Questions

What are invisible characters?

Zero-width spaces, non-breaking spaces, soft hyphens and direction marks. They come in with copied text and break searches, code and word counts.

Which readability score is used?

Flesch reading ease for English: higher is easier, and 60-70 is plain English.