句首大写和标题大写有什么区别？

句首大写只把每句话的第一个字母大写，其余保持小写，适合正文段落；标题大写会把每个单词的首字母都大写，适合标题和栏目名。

全角半角是什么意思？

全角字符在中文字体中占一个汉字的宽度，半角占一半。中文文档里混入全角英文和数字会显得别扭，可以用“转半角”统一清理。

不会。大小写只对英文字母有意义，中文字符、数字和标点都会原样保留。全角半角转换则会作用于 ASCII 可见字符和空格。

大写/小写/首字母大写/驼峰/下划线互转。

大小写case驼峰

关于「字母大小写转换」

它属于「文本处理」分类：中文排版、编码转换、统计与内容检查。

完全免费、无需注册；所有处理都在浏览器本地完成，文件不会上传到任何服务器。

相关关键词：字母大小写转换、文本处理、大小写、case、驼峰、在线工具、免费

如何使用「字母大小写转换」

常见问题

句首大写和标题大写有什么区别？: 句首大写只把每句话的第一个字母大写，其余保持小写，适合正文段落；标题大写会把每个单词的首字母都大写，适合标题和栏目名。
全角半角是什么意思？: 全角字符在中文字体中占一个汉字的宽度，半角占一半。中文文档里混入全角英文和数字会显得别扭，可以用“转半角”统一清理。
转换会影响中文吗？: 不会。大小写只对英文字母有意义，中文字符、数字和标点都会原样保留。全角半角转换则会作用于 ASCII 可见字符和空格。

Letter Case Converter (English)

Upper/lower/title/camel/snake case conversion.

Belongs to “Text Tools”: Chinese typography, encoding conversion, statistics and content checks.

Sentence case: uppercases the first letter after <code>. ! ? ;</code>.
Title case: capitalizes the first letter of every word, common in headings.
Toggle case: swaps upper/lower, handy for text typed with Caps Lock on.
Full/Half-width: full-width chars take two slots, common in Chinese layout; half-width is standard ASCII width.
Chinese, digits and punctuation are unaffected by case changes; only English letters change.

Free, no sign-up; everything runs locally in your browser and files are never uploaded.

Keywords: Letter Case Converter, Text Tools, case, camel, online tool, free

Open the tool：Open the “Letter Case Converter” page — no sign-up and nothing to install.
Prepare the input：Prepare the content or file to process: paste text or drop a file onto the page (this tool belongs to “Text Tools”).
Provide the input：Paste your content into the input box or drop a file onto the page; you can also click “Sample” to try example data first.
Adjust options and run：Adjust the options if needed, then click the process / convert / generate button.
Get the result：Everything runs locally in your browser; copy or download the result — your files are never uploaded.

Sentence vs title case?: Sentence case only capitalizes the first letter of each sentence (good for body text); title case capitalizes every word (good for headings).
What are full/half-width?: Full-width chars take one Chinese-char width in CJK fonts, half-width takes half. Full-width Latin/digits in Chinese docs look odd; use “half-width” to clean up.
Does it affect Chinese?: No. Case only matters for English letters; Chinese, digits and punctuation stay. Full/half-width conversion applies to visible ASCII chars and spaces.

Simplified ⇄ Traditional — Convert between Simplified and Traditional Chinese variants.
Chinese to Pinyin — Convert Chinese to pinyin with tones, initials and polyphones.
Circled Numbers & Letters — Convert digits and letters into circled Unicode chars.
Mars Text Converter — Convert between plain text and "Mars" (stylized) text.
Word & Char Counter — Count characters, Chinese chars, words, lines and reading time.
Text Formatter — Clean blank lines, space CJK/English, unify punctuation.
Dedupe & Sort Lines — Dedupe, sort, reverse and shuffle lines.
Text Diff — Compare two texts line by line with highlights.
RMB Amount in Words — Convert numeric amounts into Chinese capital letters.
Banned Word Checker — Built-in e-commerce/content sensitive-word list, customizable.
ID Card Info Extractor — Extract birthday, gender, region from an ID number and validate.
Smart To-Do List — Local to-do list with priority and filtering.