Calculate a readability score for English, German or French text - locally in your browser, no upload.
Running locally on your device ...
Running locally on your device ...
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Your files never left your device
No. Everything runs in your browser - your file never leaves your device. How this is verifiable
A readability index estimates how easy a text is to read, from sentence length and the number of syllables per word. The problem: the best-known formula (Flesch Reading Ease) was built for English, and applying it directly to another language gives a misleading result, because syllable structure and sentence construction differ by language. This tool therefore applies a separate formula actually developed for each language.
For English it computes the Flesch Reading Ease (0-100, higher = easier) and the Flesch-Kincaid Grade Level (an approximate US school grade). For German it uses the Flesch-Amstad formula (Toni Amstad, 1978) - a genuinely distinct adaptation with different coefficients, not a relabeled English formula. For French it uses the Kandel-Moles formula (1958). All three are computed from the average sentence length (words per sentence) and the average number of syllables per word.
Syllable counting is a vowel-group estimate (a run of consecutive vowels counts as one syllable, a trailing silent English "e" is dropped) - not a dictionary-exact split, but the approach most readability calculators use. The whole calculation runs entirely locally in your browser in pure JavaScript - your text is not uploaded, not stored, and no foreign library is loaded from a CDN.
| Input formats | Text input |
|---|---|
| Output format | TXT |
| Batch processing | No |
| Processing | Locally in your browser (JavaScript) |
| File upload | None |
Limitations: A real, purpose-built formula exists only for English, German and French - for any other language this tool deliberately returns no result instead of misapplying an unsuitable formula. Syllable counting is a vowel-group estimate, not a dictionary-exact split. The 0-100 band (very easy to very difficult) is the established English Flesch scale, applied here as an approximation to the German and French formulas too.
No. The calculation runs entirely locally in your browser; your text never leaves your device and is not stored.
Because only English, German and French have an established formula genuinely developed for that language. Applying an English formula to another language would give a misleading result - this tool deliberately avoids that.
It approximates the US school grade needed to understand the text without difficulty - the higher the number, the more demanding the text. It is only computed for English.
No. In 1978 Toni Amstad adapted both the coefficients and the constant for German - it is a distinct formula, not a relabeled copy of the English one.
It is an estimate based on runs of consecutive vowels, not a dictionary-exact split - the usual trade-off in most readability calculators.