转换大小写

在下方输入或粘贴文本，立即在浏览器中转换为大写、小写、标题等格式。

字符数: 0 单词数: 0 行数: 0

100% 在浏览器中 • 100% 安全 · ISO 27001 • 数据不会离开您的设备

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每个类别都有自己的专属页面和干净的URL。

文本工具

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图像和媒体

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计算器

每种文本格式详解

Pick a style above and the change happens instantly. Here is exactly what each one does, with a worked example.

句子大小写

Capitalises the first letter of every sentence and lowercases the rest, so pasted text that arrived in ALL CAPS or mIxEd cAsE reads normally again. Sentence boundaries are detected after full stops, question marks and exclamation marks.

This is an example of sentence case.

Lower case

Converts every character to lowercase. Handy for cleaning up shouty headlines, normalising email addresses and tags, or preparing text before you feed it into a slug or a database key.

this is an example of lower case.

Upper case

Turns the whole selection into capital letters. Useful for headings, product codes, spreadsheet columns and anywhere a house style calls for uppercase without you retyping a word.

THIS IS AN EXAMPLE OF UPPER CASE.

Capitalised case

Capitalises the first letter of every word and leaves the remaining letters untouched. It is the quickest way to tidy up names, menu labels and short headings where each word should start with a capital.

This Is An Example Of Capitalised Case.

Title case

Applies proper title styling: important words are capitalised while short joining words such as "an", "of" and "the" stay lowercase unless they open the title. This is the style most editors expect for articles and essays.

This Is an Example of Title Case.

Alternating case

Flips between lowercase and uppercase letter by letter, whatever case the text started in. Popular for playful captions and memes where the wobbling rhythm is the whole point.

tHiS Is aN ExAmPlE Of aLtErNaTiNg cAsE.

Inverse case

Swaps the case of every character: capitals become lowercase and lowercase becomes capital. It is the fastest fix for a line typed with Caps Lock on by mistake.

tHIS IS AN EXAMPLE OF INVERSE CASE.

关于此工具

在下方输入或粘贴文本，立即在浏览器中转换为大写、小写、标题等格式。

它是如何工作的？

数据不会离开您的设备.

隐私与安全

100% 安全 · ISO 27001.

常见问题

How do I convert text to another case?
Paste or type your text into the box at the top of this page, then choose a style such as Sentence case, UPPER CASE or Title Case. The result appears straight away and you can copy it with one click.
Is my text uploaded to a server?
No. Every conversion runs inside your own browser using JavaScript. Your text never leaves your device, which is why the tools work instantly and keep working if your connection drops.
Is there a limit on how much text I can convert?
There is no fixed limit. Because the work happens locally, the only practical ceiling is your own device memory — documents of many thousands of words convert without trouble.
What is the difference between Title Case and Capitalised Case?
Capitalised Case puts a capital on every single word. Title Case follows editorial rules instead, keeping short joining words such as "of", "an" and "the" lowercase unless they begin the title.
Do I need to create an account or install anything?
No account, no download, no extension. Open the page and start converting. Every tool on the site is free and works the same way on desktop and mobile.
Can I use the converted text commercially?
Yes. The text stays yours — the tools only change its formatting, so you keep every right you had over the original wording.