Text Case Converter
Convert text to uppercase, lowercase, title case, or sentence case.
Text Case Converter — what it does
Convert text between uppercase, lowercase, title case and sentence case in one step. Retyping a heading because it arrived in the wrong case is exactly the kind of small friction that adds up, and case conversion removes it entirely.
When this tool helps
- Fixing a heading or title that arrived in all capitals.
- Normalising imported data where capitalisation is inconsistent between records.
- Converting a sentence to title case for a heading, or back for body text.
How to use it
- Paste the text.
- Choose the target case.
- Review the converted output.
- Copy the result.
Accuracy, limits, and good practice
- Title case rules differ between style guides on which short words stay lowercase — check the result against the guide you follow.
- Automatic conversion does not know proper nouns, so lowercasing a paragraph will also lowercase names and places.
- Sentence case capitalises the first letter after each terminator, which can misfire on abbreviations such as etc. and e.g.
- Convert before importing names into a system that matches on text; inconsistent capitalisation is a common reason two records that describe the same person never merge.
Frequently asked questions
Which case should headings use?
It is a house-style decision. Sentence case is increasingly common in interfaces and documentation; title case remains standard in publishing.
Does it handle accented characters?
Yes, case conversion covers accented Latin characters correctly.
Why is all-caps discouraged for long text?
It removes word-shape cues that readers rely on, measurably slowing reading — which is why it suits short labels and not paragraphs.
Can it fix text typed with caps lock on?
Lowercasing then applying sentence case recovers readable prose, though proper nouns still need correcting by hand.
Related tools on this site
- PDF Form Filler — Load AcroForm fields, enter values, and export a filled or flattened PDF
- Permanent PDF Redaction — Permanently cover selected rectangular areas by rebuilding rasterized PDF pages
- Rotate PDF — Rotate every page by 90, 180, or 270 degrees
Everything above runs inside this page. Text Case Converter needs no account, no upload, and no server round trip — close the tab and nothing is left behind.
文字大小寫轉換能做什麼
一步在大寫、小寫、標題大寫與句首大寫之間轉換文字。因為標題大小寫不對而重打一次，正是那種積少成多的小摩擦，而大小寫轉換能把它完全消除。
什麼時候用得上
- 修正整段全大寫送來的標題。
- 統一匯入資料中各筆紀錄大小寫不一致的問題。
- 把句子轉成標題大寫用於標題，或轉回一般寫法用於內文。
使用步驟
- 貼上文字。
- 選擇目標大小寫格式。
- 檢視轉換結果。
- 複製結果。
精確度、限制與實務建議
- 各種寫作規範對「哪些短字維持小寫」的規則不同，請對照你採用的規範檢查結果。
- 自動轉換不認得專有名詞，把整段轉小寫也會把人名與地名一起轉掉。
- 句首大寫是在每個句末符號後把首字母大寫，遇到 etc.、e.g. 這類縮寫可能誤判。
- 把姓名匯入以文字比對的系統前先轉換；大小寫不一致，正是描述同一人的兩筆紀錄永遠合不起來的常見原因。
常見問題
標題該用哪種大小寫？
這是編輯風格的決定。介面與文件越來越常用句首大寫，出版界則仍以標題大寫為主。
支援重音字元嗎？
支援，大小寫轉換能正確處理帶重音的拉丁字元。
為什麼長文不建議全大寫？
它抹掉讀者依賴的字形輪廓線索，實測會拖慢閱讀——所以它適合短標籤而不適合段落。
可以修正誤開大寫鎖定打出來的文字嗎？
先轉小寫再套句首大寫即可恢復可讀，但專有名詞仍需人工修正。
本站相關工具
- PDF 表單填寫器 — 載入 AcroForm 欄位、填寫內容並匯出填妥或扁平化 PDF
- PDF 永久遮蓋 — 重建點陣化 PDF 頁面，永久覆蓋指定矩形區域
- 旋轉 PDF — 將所有頁面旋轉 90、180 或 270 度
以上步驟全部在這個頁面內完成，文字大小寫轉換 不需要註冊、不上傳檔案、也不經過伺服器，關閉分頁後不會留下任何資料。