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Case Converter

Convert text to UPPER, lower, Title and Sentence case.

Best for: Cleaning pasted text, normalising headings, or converting a label into a variable name, database column or slug.

Complete guide

Input

How it's calculated & sources
The Case Converter uses the standard, deterministic formula, so the same inputs always produce the same result. It runs entirely in your browser, so your inputs are never uploaded. Last reviewed June 2026.

Free & no sign-up · runs entirely in your browser. Results are estimates for general information, not professional advice — verify important decisions with a qualified expert. Last reviewed June 2026.

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Complete guide

Quick answers

Short, sourced answers to the questions people (and AI assistants) ask most.

What is Case?
A case converter rewrites text into a chosen capitalisation or naming style — UPPERCASE, lowercase, Title Case, Sentence case, camelCase, snake_case or kebab-case — in one click.
Why does Case matter?
The same words, re-styled. Pick the convention your target expects — prose, code identifiers, file names or URL slugs.
How is Case calculated?
It splits the text into words, then rejoins them with the capitalisation and separator the chosen style needs — spaces for prose, underscores for snake_case, hyphens for kebab-case, and no separator with internal capitals for camelCase.
What are common case mistakes?
Title-casing small words (a, of, the) — style guides differ on whether to capitalise them.
When should you use the Case Converter?
Cleaning pasted text, normalising headings, or converting a label into a variable name, database column or slug.

What is the Case Converter?

A case converter rewrites text into a chosen capitalisation or naming style — UPPERCASE, lowercase, Title Case, Sentence case, camelCase, snake_case or kebab-case — in one click.

How the Case Converter works

It splits the text into words, then rejoins them with the capitalisation and separator the chosen style needs — spaces for prose, underscores for snake_case, hyphens for kebab-case, and no separator with internal capitals for camelCase.

Worked example

"hello world" → Title: Hello World · snake: hello_world · kebab: hello-world · camel: helloWorld

Common mistakes to avoid

  • Title-casing small words (a, of, the) — style guides differ on whether to capitalise them.
  • Breaking acronyms — API may become Api or api depending on the style.
  • Assuming Sentence case only touches the first letter when proper nouns also need capitals.

Keywords: uppercase, lowercase, case.

Sources: MDN — String.prototype.toLocaleUpperCase()

Reviewed by the Free Tools Galaxy editorial team · Updated June 2026 · Calculated privately in your browser.

Frequently asked questions

Is the Case Converter free to use?+

Yes. Every tool on Free Tools Galaxy is 100% free, runs in your browser and requires no signup.

How accurate is the Case Converter?+

Case Converter uses the standard case formula in double-precision arithmetic, so the same inputs always produce the same result and you can verify any figure by hand. It is an educational estimate — real-world outcomes depend on your actual rates, rules and assumptions.

Do you store my inputs?+

No. The Case Converter runs entirely in your browser. Nothing is uploaded or saved to a server.

Can I use the Case Converter on mobile?+

Yes — the interface is fully responsive and works on phones, tablets and desktops.

What are common mistakes to avoid?+

The most frequent mistake is mixing units. Double-check your inputs use a single, consistent unit before clicking Calculate.

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Share-to-grow kit (Reddit, LinkedIn, Medium)
Reddit post
Title: I built/used this free case converter — instant, no signup

Body: Convert text to UPPER, lower, Title and Sentence case. Try it: https://freetoolsgalaxy.com/tools/case-converter
LinkedIn post
Case Converter on Free Tools Galaxy — Convert text to UPPER, lower, Title and Sentence case. https://freetoolsgalaxy.com/tools/case-converter
Medium intro
# Case Converter — the free tool I keep coming back to

Convert text to UPPER, lower, Title and Sentence case.

Try it: https://freetoolsgalaxy.com/tools/case-converter
Quora answer
The fastest way is to use a free in-browser case converter: https://freetoolsgalaxy.com/tools/case-converter. Convert text to UPPER, lower, Title and Sentence case.

Embed this tool anywhere

Free embed code for blogs, docs and dashboards. Every embed sends a backlink home — helping you and the galaxy grow together.

HTML iframe
Drop into any site — auto-resizes to its content height, theme-aware.
<iframe src="https://freetoolsgalaxy.com/tools/case-converter?embed=1" title="Case Converter" loading="lazy"
  style="width:100%;height:600px;border:0;border-radius:16px;background:#0b1020"
  allow="clipboard-write"></iframe>
<script>window.addEventListener("message",function(e){if(e.data&&e.data.type==="ftg-embed-height"){document.querySelectorAll("iframe").forEach(function(f){if(f.contentWindow===e.source){f.style.height=e.data.height+"px";}});}});</script>
<p><a href="https://freetoolsgalaxy.com/tools/case-converter" target="_blank" rel="noopener">Powered by Case Converter on Free Tools Galaxy</a></p>
Responsive wrapper
Aspect-locked container — good for blog post bodies.
<div style="position:relative;padding-bottom:75%;height:0;overflow:hidden;border-radius:16px">
  <iframe src="https://freetoolsgalaxy.com/tools/case-converter?embed=1" title="Case Converter" loading="lazy"
    style="position:absolute;inset:0;width:100%;height:100%;border:0" allow="clipboard-write"></iframe>
</div>
WordPress / Markdown
Paste in a custom-HTML block or markdown file.
[Case Converter — free online tool](https://freetoolsgalaxy.com/tools/case-converter)

<iframe src="https://freetoolsgalaxy.com/tools/case-converter?embed=1" width="100%" height="600" frameborder="0"></iframe>
Text link-back
Minimal credit link — best for sidebars and footers.
<a href="https://freetoolsgalaxy.com/tools/case-converter" target="_blank" rel="noopener">Try the free Case Converter</a>

Share-to-Grow Kit

Pre-written, ready-to-paste posts for every major channel. Help others discover this tool — and earn backlinks.

Title
I built a free word counter that works instantly in the browser — no signup, no ads in your face
Body
Hey r/[subreddit],

I kept needing a quick word counter and most options online were slow or behind paywalls, so I built one that:

• Runs 100% in your browser (your data never leaves your device)
• No signup, no email wall, no popups
• Loads in under a second on mobile

It covers the standard word counter use cases (count, words, characters) and links out to the formula + worked examples if you want to learn the math.

Link: https://freetoolsgalaxy.com/tools/word-counter

Happy to take feedback — what's missing?
Post to a relevant subreddit (e.g. r/InternetIsBeautiful, r/webdev, r/productivity). Avoid spammy subs.
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