Quick answer
Paste your text, pick a style (UPPERCASE, lowercase, Title Case, Sentence case or toggle case) and press “Copy”. Tick “Remove Vietnamese accents” to turn “Đường Lê Lợi” into “Duong Le Loi”, or “Tidy spaces” to clean up extra whitespace. The result updates as you type and never leaves your browser.
What does a case converter do?
Typed a paragraph with Caps Lock on, received a messy list of names, need a title in Title Case, or need accent-free names for emails, file names or bank transfers? This converter handles it in one step and works correctly with accented Vietnamese letters (Đ, Ư, Ơ and tone marks). It also repairs text whose accents were “split” when copied from a PDF or an old keyboard, a problem that breaks search and sorting even though it looks fine.
How to change letter case
- 1
Paste or type your text into “Original text”.
- 2
Choose a style: UPPERCASE, lowercase, Title Case, Sentence case, toggle case, or “Keep as is” if you only want to strip accents or tidy spaces.
- 3
Tick “Remove Vietnamese accents” and/or “Tidy spaces and punctuation” if needed. All three options can be combined.
- 4
Press “Copy” on the result, or “Use result as the original” to transform it again.
Styles with examples
| Style | Original | Result | Typical use |
|---|---|---|---|
| UPPERCASE | Đường Lê Lợi | ĐƯỜNG LÊ LỢI | Signs, printed headings, short codes |
| lowercase | JOHN SMITH | john smith | Fixing text typed with Caps Lock |
| Title Case | nguyễn văn an | Nguyễn Văn An | Names, addresses, headings |
| Sentence case | HELLO. SEE YOU SOON! | Hello. See you soon! | Paragraphs written in all caps |
| tOGGLE cASE | Việt NAM | vIỆT nam | Text typed with Caps Lock inverted |
| Remove accents | Đặng Thị Hưởng | Dang Thi Huong | Usernames, emails, file names, plain SMS |
Swipe sideways to see the whole table →
What “Tidy spaces” does
| Before | After | Rule |
|---|---|---|
| Hello world | Hello world | Collapse repeated spaces and tabs |
| one ,two | one, two | No space before punctuation, one space after a comma |
| indented | indented | Trim spaces at the start and end of each line |
| Several blank lines | One blank line | Keep at most one blank line between paragraphs |
Examples
A messy customer list
“NGUYỄN văn AN”, “trần THỊ bình”: choose Title Case to get “Nguyễn Văn An”, “Trần Thị Bình” for the whole list at once.
Names for bank transfers
Many Vietnamese banks expect names in capitals without accents: choose UPPERCASE and tick “Remove accents” to turn “Lê Thị Hồng Nhung” into “LE THI HONG NHUNG”.
Text copied from a PDF
It looks normal but Ctrl+F can't find it: the tool reports how many split accents it found and the result is normalised to NFC, so pasting it back makes search work.
Article headings
“how to cook hanoi beef pho” becomes “How to cook hanoi beef pho” in Sentence case; fix “Hanoi” by hand because proper names can't be detected automatically.
Common problems
- Sentence case lowercases proper names.
- It lowercases everything and only capitalises sentence starts, so it can't tell names from ordinary words. Fix names afterwards.
- Title Case capitalises small words like “and” or “of”.
- It capitalises every word, which suits names. For headline styles such as AP or Chicago, lowercase the small words by hand.
- Some odd characters remain after removing accents.
- Only Vietnamese and other Latin accents are removed; emoji, symbols, Chinese or Thai characters stay as they are.
- Two texts look identical but search fails.
- One may use split accents (a base letter plus separate marks). Paste it in with “Keep as is” and copy the result, which is normalised to precomposed characters.
Why accented Vietnamese needs special handling
A letter such as “ệ” can be stored as one precomposed character (U+1EC7) or as “e” plus two combining marks. Both look identical but computers treat them as different strings, which breaks search, sorting and comparison. The tool always normalises text to NFC, the precomposed form used on the web and by most software.
Case changes follow Vietnamese rules: uppercase “i” is “I” (not the dotted “İ” used in Turkish) and “đ” becomes “Đ”. When accents are removed, “đ / Đ” become “d / D” and capitals are kept.
Glossary
- Title Case
- The first letter of every word is capitalised, e.g. “John Smith”.
- Sentence case
- Only the first letter of each sentence is capitalised.
- Precomposed Unicode (NFC)
- Each accented letter is a single character; the standard form on the web.
- Decomposed Unicode (NFD)
- A base letter followed by separate accent marks; looks the same as NFC but compares differently.
Frequently asked questions
Can it handle very long text?
Yes. Hundreds of thousands of characters convert instantly on your device; the text boxes use system fonts so typing stays fast.
Does removing accents drop the letter “đ”?
No: “đ” becomes “d” and “Đ” becomes “D”.
Can I combine options?
Yes, for example UPPERCASE + remove accents + tidy spaces. The order is NFC normalisation, case change, accent removal, then whitespace tidying.
Are line breaks kept?
Yes. Lines stay as they are; “Tidy spaces” only collapses runs of blank lines into one.
Is my text uploaded?
No. Everything runs in your browser and disappears when you close the tab.
Ratings and comments
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