Altto
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Free · No sign-up · Runs in your browser

Free Case Converter.

Convert text between UPPERCASE, Title Case, camelCase, snake_case and more — updates instantly as you type, with nothing ever sent anywhere. Styles such as lowercase and Sentence case change every letter, so acronyms like NASA and brand names like iPhone need checking by hand afterwards.

Not uploaded — runs in your browser 11 case styles in one tool Live word/character/line count No subscription or account
Your text
Case style
Result
0Words
0Characters
0Lines
Nothing here is ever uploaded — every conversion happens right in this browser tab, on your device. There's no server involved, so we never see it, copy it or keep it.

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At a glance

Case converter: quick facts

Switch text between 11 case styles instantly, in your browser.

Updated

Price
Free, no sign-up, no limits.
Styles
UPPERCASE, lowercase, Title Case, Sentence case, aLtErNaTiNg, Inverse, camelCase, PascalCase, snake_case, CONSTANT_CASE and kebab-case.
Your text
The original stays in place; the converted version appears alongside.
Watch for
Acronyms and brand names (NASA, iPhone) may need fixing by hand afterwards.
Privacy
Your text stays in your browser.
How it works

How to change the case of text

Paste your text, pick a style and the result updates as you type, with word, character and line counts underneath. Copy it with one click when it looks right.

  1. 01

    Paste or type your text

    Into the box at the top of the tool.

  2. 02

    Choose a case style

    Eleven everyday and programmer styles to pick from.

  3. 03

    Copy the result

    Use the Copy button, or keep switching styles freely.

Tips

Tips for converting case cleanly

A converter changes every letter the same way, so it helps to know where a quick check is needed afterwards.

  • Title Case isn’t the same everywhereStyle guides disagree on small words, and some keep “and”, “of” and “the” lowercase in headings. Title Case here capitalises every word, so check a heading against your house style before publishing.
  • Put capitals back on namesSentence case lowercases everything after the first letter of each sentence, including names and places. Read the result through and restore capitals on words like London or Sarah.
  • Fix text typed with Caps Lock onInverse Case swaps every letter, so a paragraph typed as “tHIS iS mY rEPORT” comes out as “This Is My Report” without any retyping.
  • Name things the way code expectsUse camelCase for JavaScript variables, snake_case for Python and database columns, and kebab-case for web addresses and CSS classes. Converting a plain phrase gets the joins and capitals right in one step.

Like every Altto tool, this runs on your device — nothing you add is uploaded. How Altto works

11

case styles in one place, from everyday UPPERCASE and Sentence case to the camelCase, snake_case and kebab-case used in code.

FAQ

Frequently asked questions

What each style does, and how the converter decides where words begin. Our guide to text case styles explains where each one is used.

What case styles does this cover?
Eleven in total — the everyday styles (UPPERCASE, lowercase, Title Case, Sentence case, aLtErNaTiNg CaSe, and Inverse Case) plus the programmer styles (camelCase, PascalCase, snake_case, CONSTANT_CASE and kebab-case) in the same tool, rather than splitting them across separate pages.
What's the difference between Title Case and Sentence case?
Title Case capitalises the first letter of every word (“The Quick Brown Fox”), the style used for headings and titles. Sentence case only capitalises the first letter of each sentence, the way normal prose is written (“The quick brown fox.”).
How does it handle converting to camelCase, snake_case or kebab-case?
It splits your text into individual words first — on spaces, hyphens and underscores, and at the boundary between a lowercase and an uppercase letter — so pasting in “some-value”, “someValue” or plain “some value” all convert the same way, whichever style you started from.
Is my original text changed?
No. Your text stays in the “Your text” box and the converted version appears under Result, so nothing is lost. Pick another style, or edit the original, and the result updates straight away.
Why did my acronyms change?
Styles such as lowercase and Sentence case change every letter, so NASA can come out as Nasa or nasa, and brand names like iPhone lose their capitals. Check acronyms and names after converting and fix those by hand.
Which style should I use for file names?
For files you’ll share or put online, kebab-case, such as monthly-report-2026.pdf, is the safest choice: there are no spaces to break web links, and it’s easy to read. snake_case works just as well if you prefer underscores.
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