Free text tool

Case Converter

Paste text and the converter shows it in nine styles, from upper and lower case to title case and programming formats such as camelCase and snake case.

By iToolsLab Editorial TeamUpdated 14 October 2026How we build tools

What is case converter?

Case conversion saves time when you fix headlines typed in capitals, format titles for a blog or rename variables in code.

The tool shows every style at once, each with its own copy button.

How to use the case converter

  1. Paste your text.
  2. Look through the nine versions that appear.
  3. Copy the one you need.

How the case converter works

Title case capitalizes the first letter of every word. Sentence case capitalizes the start of each sentence. Programming styles first split the text into lower case words, then join them with a rule such as no space plus capitals, underscores or hyphens.

Worked example

The text hello world example becomes HELLO WORLD EXAMPLE, Hello World Example, helloWorldExample, hello_world_example and hello-world-example.

Common uses of the case converter

  • Fixing text typed with caps lock on.
  • Formatting headlines and titles consistently.
  • Renaming variables in code between camelCase and snake case.
  • Preparing file names and URL parts.
  • Cleaning imported data from spreadsheets.

Tips and common mistakes

Real title case rules skip small words such as of and the. For headlines, check these by hand.

Use kebab case for URLs and snake case for database fields.

Background: what to know before you rely on it

Letter case has rules that vary by language and purpose. English title case capitalizes the main words, while sentence case only capitalizes the first word and proper nouns. Programming communities use naming styles to keep code readable: camelCase in JavaScript, snake case in Python and kebab case in CSS and URLs. Case also matters for computers. File names and URLs can be case sensitive on some servers, so keeping to lowercase avoids broken links. When you convert a block of text, review proper nouns, acronyms and brand names by hand, because tools cannot know that NASA or iPhone should keep their form.

Private, free and fast

This tool runs entirely in your browser. What you type or choose is not uploaded to a server and is not saved after you close the page, which keeps it fast and private. It is free to use as often as you like. See more in all text tools, or browse the full list of tools.

Frequently asked questions

What is title case?

Each main word starts with a capital letter.

What is camelCase?

Words joined together with each word after the first starting with a capital.

Is the tool safe for private text?

Yes. Nothing leaves your browser.

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Results are for information and education. For legal, financial, medical or security decisions, check with a qualified professional. Always proofread output before you publish.