Long sentences are the single biggest readability problem in Chinese writing. Because Chinese has no spaces between words and packs meaning densely into each character, a sentence that runs past 40–50 characters becomes hard to parse at a glance. This tool splits your Simplified Chinese text into sentences, measures each one in Han characters, and shows you the distribution so you can find and fix the run-ons.
How it works
The tool segments text on the Chinese sentence-terminating punctuation marks — the full stop 。, exclamation mark ！ and question mark ？ — plus their ASCII equivalents . ! ?. Each chunk between these marks is one sentence.
For each sentence it counts only CJK ideographs (the Unicode range U+4E00–U+9FFF and common extensions), ignoring Latin letters, spaces and punctuation. Sentences are then sorted into buckets:
- Short: 1–15 characters
- Medium: 16–40 characters
- Long: more than 40 characters (flagged)
You can change the long threshold to match your house style.
Why length distribution matters in Chinese
In English, readability research often focuses on average sentence length in words, but Chinese writing presents a different challenge. Chinese sentences have no word-boundary spaces, so the reader must segment the text mentally as they read. A sentence of 80+ characters may contain a complex nested clause structure that is grammatically valid but demands significant working memory to parse. Research on Chinese readability consistently identifies long sentences as the primary barrier for readers at the middle and lower end of a text’s intended audience.
Short sentences are not automatically better — a series of 5–8 character sentences can feel choppy and lose the logical flow between ideas. The goal is a varied distribution with a majority in the medium range and a manageable proportion of long ones.
Common causes of sentence inflation in Chinese prose
- Stacked relative clauses: Chinese places relative clauses before the noun they modify, and multiple nested clauses can produce very long noun phrases before the main verb appears.
- Coordination without explicit connectors: Chinese can chain clauses with just a comma where English would use “and,” “but,” or “so.” A sequence of five comma-joined clauses produces a long sentence even though each clause is short.
- Formal register: Legal, academic and official Chinese tends toward long sentences with multiple embedded qualifications, deliberately to avoid ambiguity. For those genres, a higher threshold (e.g. 60–80 characters) may be more appropriate.
Worked example
Paste a paragraph such as:
今天天气很好。我们去公园散步，看到很多花，还遇到了老朋友，聊了很久才回家。
The tool reports two sentences: the first is 6 characters (short) and the second is 24 characters (medium). Average length: 15 characters. No sentences above the 40-character threshold.
Now try a long government document excerpt and the distribution will skew heavily toward the medium and long buckets, with averages commonly in the 40–60 character range.
Editing suggestions
When a sentence is flagged as long, look for these natural break points:
- A Chinese comma
，between two complete clauses can usually become a full stop。. - A semicolon
；can similarly become a full stop where the two halves stand independently. - A paired connector like
虽然…但是…(although…but…) is a strong signal that the sentence contains two logically separable ideas.