Chinese Text Diff: Compare Two Chinese Texts
See exactly what changed between two versions of a Chinese text — word by word, not line by line. Catches the changes that are easy to miss: full-width commas, invisible characters, 的/地/得 corrections and near-duplicate pages.
Compare Chinese Texts
84% the same. If these are two pages on one website — city pages, product variants, a page and its copy — search engines see them as near-duplicates and usually rank only one. Rewrite the shared parts with information specific to each page.
Worth checking
- Punctuation only 1
∅→ ，
Changes in punctuation marks.
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Why Ordinary Diff Tools Fail with Chinese
A diff tool compares two texts and marks what was removed and what was added. Most tools — in Word, Git or online — split text at spaces. That works for English, where every word is separated. Chinese is written without spaces, so for these tools a whole sentence like 我们为欧洲企业提供百度推广服务 is one single "word". Change one character, and the entire sentence is marked as replaced.
This tool first splits Chinese into words, using the same method as our word segmentation tool, then compares sentence by sentence and word by word. The result: 欧洲 → 欧美 shows as exactly that. Switch to Characters to see the smallest possible change.
When Marketing Teams Compare Chinese Texts
- Reviewing translator or editor changes. You receive a "final" Chinese version and need to know what changed since the version you approved — without reading Chinese.
- Checking what a client, distributor or legal team edited. Approval rounds in China often come back as a new file without tracked changes.
- Finding near-duplicate pages. City pages, product variants and location landing pages often differ only in a place name. The similarity score shows how much is really unique.
- Comparing your content with a copy. Found your text on another site? Paste both to see how much was taken.
- Checking a page after a website migration. CMS changes can convert punctuation, add hidden characters or drop text — differences you won't see by looking.
- Comparing ad copy versions. Know which wording ran in which version of a Baidu or WeChat campaign.
Hidden Differences in Chinese Text
Some changes are almost impossible to see — but they matter for search, layout and quality. The tool lists them separately under Worth checking:
| Difference | Example | Why it matters |
|---|---|---|
| Full-width vs half-width | ，vs , · ：vs : · １ vs 1 | Chinese text uses full-width punctuation. Half-width commas in Chinese sentences look careless and often reveal machine-processed or copied text. |
| Invisible characters | Zero-width space U+200B, BOM U+FEFF | Break keyword matching, site search and URLs. Common after copying from WeChat articles, PDFs or Word. |
| Full-width space | (U+3000) | Used for paragraph indents in Chinese print, but creates odd gaps on web pages. |
| 的 / 地 / 得 | 认真的检查 → 认真地检查 | The most common correction by Chinese editors. Wrong use looks unprofessional to native readers. |
| Look-alike characters | 己 / 已 · 末 / 未 · 在 / 再 | Different meaning, nearly the same shape or sound. A wrong one is a typo spell-checkers often miss. |
Similarity, Duplicate Content and Baidu
The similarity score is the share of characters both texts have in common, in the same order. For two versions of one text, it shows how heavily it was edited. For two different pages, it shows how much of each page is unique.
Baidu, like every search engine, avoids showing several near-identical pages for one search. When a site publishes many pages that differ only in a city or product name, usually one ranks and the others are ignored — and Baidu's quality algorithms target sites that publish copied or mass-produced content. If the score for two of your pages is above about 80%, give each page its own substance: local details, prices, cases, people, opening hours. There is no published Baidu threshold; treat the number as a warning sign, not a rule.
Reviewing a Chinese Text Revision: Checklist
For marketing teams that publish Chinese content without reading every word themselves.
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Always keep the approved version
Without the original, there's nothing to compare. Store the version you approved, not only the latest file.
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Check every changed number
Prices, dates, phone numbers and quantities are where edits do the most damage. The diff lists them under Numbers.
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Ask about changes you didn't request
Unrequested edits to claims, product names or legal wording need a reason. Watch especially for absolute words like 最 or 第一. Check Advertising Law terms →
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Remove invisible characters before publishing
If the diff marks ZWSP or BOM, clean the text — they break search and copy-paste for your readers.
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Use one punctuation standard
Full-width punctuation in Chinese sentences, consistently. Convert full-width and half-width →
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Make similar pages different where it counts
City and product pages need their own content, not just a new name in the title. Aim for a clearly lower similarity score.
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Let a native speaker read the final version once
A diff shows what changed, not whether the change is good Chinese.
From our Baidu SEO and Chinese content work for Western companies since 2012.
Frequently Asked Questions
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Paste the original into the first box and the new version into the second. The tool marks every removed word in red and every added word in green, shows how similar the two texts are, and lists changes that are easy to miss — such as full-width punctuation, invisible characters or 的/地/得 corrections.
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Most text comparison tools split text at spaces or line breaks. Chinese has no spaces between words, so they treat a whole sentence or paragraph as one "word" and mark all of it as changed, even if only one character differs. This tool splits Chinese into words first (or compares character by character) and only marks what really changed.
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Words is easier to read: 欧洲 → 欧美 shows as one changed word. Characters shows the smallest possible change (洲 → 美) and is best for proofreading single-character corrections like 己 → 已.
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It is the share of characters the two texts have in common, in the same order. 100% means identical (apart from differences you chose to ignore). For two pages on the same website, a high value — especially above about 80% — means search engines will likely see them as near-duplicate content.
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Yes, for two specific texts — for example two city pages, two product variants, or your page and a copy you found. It does not search the web. Baidu, like other search engines, usually shows only one of several near-identical pages, and its algorithms against scraped content target sites that publish copied text at scale.
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Characters like the zero-width space (U+200B) take up no space on screen but are part of the text. They often come from copying out of Word, PDFs, WeChat articles or CMS editors. They can break keyword matching, search, form validation and URLs. The tool marks them as ZWSP, BOM and similar labels.
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Yes. Comparison works for any text. It does not treat Simplified and Traditional versions of the same character as equal, so comparing a Simplified text with its Traditional version will show every converted character as a change.
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Yes, it is free and needs no sign-up. Both texts are only used to calculate the comparison and are not stored or logged. You can compare up to 10,000 characters per text.
Built by Jademond Digital, a Chinese digital marketing agency founded in Guangzhou in 2012. Word list: mozillazg/phrase-pinyin-data (MIT licence). About us →