Uppercase and Lowercase Converter

Convert text to uppercase, lowercase, sentence case, title case, and capitalization in the browser without sending text to the server.

Convert capitalization

Paste text, choose a mode, and copy the result generated in the browser.

Original text

Conversion happens in your browser. This tool does not send text to the server.

Text to convert

Conversion mode

Choose how letters should be transformed.

Transformation

Converts letters to uppercase and preserves numbers, punctuation, spaces, and emoji.

Preserve line breaksWhen disabled, line breaks become spaces before conversion.

By default, the link stores only the mode and safe options.

Include text in the shared link

The current link does not include pasted or typed text.

Quick questions

Is the text sent to the server?

No. Conversion happens in the browser. Text only enters the link if you enable the option to include text when sharing.

What is the difference between sentence, title, and capitalize words?

Sentence capitalizes sentence starts. Title tries to handle short connector words. Capitalize words changes the start of every word.

Does the tool handle accents and emoji?

Yes. Conversion uses browser language features and preserves punctuation, numbers, spaces, and emoji.

Why can the result differ from a text editor?

Each editor may apply its own rules for names, acronyms, brands, and styles. This tool uses a simple deterministic rule.

Can I share already filled text?

Yes, but only after enabling the option to include text in the link. Use that only when recipients are allowed to read the content.

Does this remove accents or create slugs?

No. This tool changes capitalization. Accent removal, text cleanup, and slug creation are separate transformations.

About the uppercase and lowercase converter

The converter transforms text in the browser to uppercase, lowercase, sentence case, title case, per-word capitalization, alternating case, or inverted case. It preserves the original text and shows character and byte metrics for review.

How to convert text online

Type or paste text, choose the conversion mode, and copy, download, or use the result as new input. Shared links preserve only safe options by default; include text in the link only if it can be public.