Free case converter — change text case in your browser

How do I change the case of my text?

To change the case of your text, type or paste it into the box and every version appears at once — UPPERCASE, lowercase, Title Case, Sentence case, camelCase, PascalCase, snake_case, kebab-case, and aLtErNaTiNg. Copy the one you need with a single click. With MumenLabs Case Converter the whole conversion runs inside your browser, so your text never leaves your device, there is no sign-up, and there are no limits.

You type once, and the tool does the rest — no menus, no re-typing, no switching between different single-purpose converters.

Every case, side by side

Instead of hunting for one format at a time, you see them all together and pick the one that fits:

• UPPERCASE and lowercase — for shouting, or for calming text back down.
• Title Case — capitalise every word, for headings and titles.
• Sentence case — capitalise the start of each sentence, for normal prose.
• camelCase and PascalCase — for variable and class names in code.
• snake_case and kebab-case — for file names, database columns, and URLs.
• aLtErNaTiNg — for a bit of fun.

Each one updates live and has its own copy button.

Your text never leaves your device — provably

You often reformat text that is not meant to be public: an unpublished headline, a client's copy, an internal label, a code identifier from a private repo. MumenLabs Case Converter does all the work locally, in your browser. When you paste text, it is transformed in your browser's memory and never transmitted to us or anyone else.

You do not have to take our word for it. Turn off your internet connection and convert anyway. It still works, because there is nothing to send. A tool that uploaded your text could not function offline; this one can.

Built for real writing and real code

The everyday jobs a case converter solves are split between two worlds, and this tool handles both:

• Fixing capitalisation. Rescue text ruined by a stuck caps-lock key, tidy a headline into Title Case, or drop an over-formatted paragraph back into Sentence case — without retyping a word.
• Writing clean identifiers. Turn a plain phrase like "user profile settings" into userProfileSettings, UserProfileSettings, user_profile_settings, or user-profile-settings for code, files, and URLs. It even understands input that is already camelCase or PascalCase and re-splits it correctly.

How to convert case, step by step

1. Type or paste your text. Write directly in the box or paste from anywhere. It loads into your browser instantly — no upload, because there is no server.
2. See every case instantly. All the variants appear at once and update live as you edit.
3. Copy the one you need. Click copy on the format you want and paste it wherever you are working.

Who it is for

MumenLabs Case Converter is built for anyone who reformats text often:

• Writers and editors fixing headlines, titles, and all-caps mistakes.
• Developers generating variable, class, file, and URL names in the right style.
• Marketers formatting campaign names, slugs, and social copy.
• Data analysts normalising column names and labels.
• Students cleaning up notes and headings.
• Anyone who wants to change text case without uploading it to a stranger.

More free text tools

Working with text? Count words, characters, and reading time with the Word Counter, or clean up and validate structured data with the JSON Formatter — both also run 100% in your browser.

The bottom line

MumenLabs Case Converter is the free, private, instant way to change text case — every common format from UPPERCASE to kebab-case, all in one place and all 100% in your browser. Because your text never leaves your device, it is the safe choice for copy and code that should never be sent to someone else's server.

Open the tool and start typing — every case appears instantly, with no upload, no sign-up, and no limits.