Paste your writing to see every sentence color-coded by length. Spot choppy fragments and run-on sentences at a glance, with thresholds you can adjust.
Varying sentence length keeps writing readable, but consistently long sentences tire a reader and consistently short ones feel choppy. Seeing the pattern visually makes it easy to fix.
Green, yellow and red highlighting shows your sentence rhythm instantly, no manual counting required.
Adjust the ideal range and long-sentence cutoff to match your genre, audience or style guide.
See total sentences, average length, and your longest and shortest sentence in one glance.
Most style guides converge on a similar idea even when the exact numbers differ: sentences in the roughly 8 to 20 word range tend to read most clearly for a general audience, since they're long enough to carry a complete thought but short enough to hold in working memory without re-reading. Sentences that regularly run past 30 words often bury the main point under multiple clauses, which is why journalism and technical writing style guides frequently flag them for review even when they're grammatically correct. On the other end, a string of very short sentences, especially three words or fewer in a row, can read as choppy or abrupt rather than punchy, unless that effect is intentional. This tool uses a regular expression to split text on sentence-ending punctuation while trying to skip over common abbreviations such as Mr., Dr., vs. and etc., since a naive splitter would otherwise break those into fragments. It isn't a full grammar parser, so unusual punctuation, nested quotations or uncommon abbreviations can occasionally cause a split to land in the wrong place, but for ordinary prose it holds up well. The real value isn't a single perfect score; it's seeing the pattern across a whole piece of writing, since a wall of green sentences with no variation can be just as flat to read as a wall of red ones, and the color pattern makes that visible in a way that a single average-length number never could.
A healthy mix of lengths, not just avoiding long sentences, is what keeps prose engaging.
Technical or legal writing can tolerate longer sentences than a blog post or marketing copy.
This tool measures length only; it doesn't evaluate grammar, clarity or word choice.
It uses a regular expression that splits on periods, question marks and exclamation points while trying to avoid breaking on common abbreviations like Mr., Dr. or etc. It is a close approximation, not a full grammar parser.
Green marks sentences in your ideal word-count range, yellow marks borderline sentences just outside it, and red marks sentences that are either very long or very short and choppy, based on your thresholds.
Yes. Open the settings panel to adjust the ideal range and the word count that counts as too long. The highlighting updates immediately.
Abbreviations, decimal numbers, ellipses and quoted dialogue can all confuse a punctuation-based splitter. The tool handles common cases but is not a substitute for a full grammar-aware parser.
Yes. It runs entirely in your browser using plain JavaScript, with no text ever uploaded or stored.
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