TextCaseConverter

About

Transform selected text on any webpage instantly, uppercase, lowercase, title case, sentence case, and toggle case. No copy-pasting to external tools needed.

TextCaseConverter is a lightweight Chrome extension that lets you change the case of any text directly on the page you're working on. 

Select text, click a button, and it's transformed in place. It works in text fields, rich text editors, Google Docs, and even on non-editable page content.

Two Modes of Operation

- Page Selection Mode
Select any text on a webpage, click the TextCaseConverter icon, and pick a transformation. The text is replaced in place — no need to copy, convert elsewhere, and paste back. If the text is non-editable, the transformed result is shown in the popup for easy copying.

- Direct Input Mode
Paste or type text directly into the extension for quick conversions without needing to interact with any webpage. Ideal for one-off transformations when drafting emails, formatting titles, or cleaning up text.

Five Case Transformations

- UPPERCASE: Converts all letters to uppercase. Great for headings, acronyms, or emphasis. Example: "sample text" to "SAMPLE TEXT"

- lowercase: Converts all letters to lowercase. Useful for cleaning up accidental caps lock or formatting code. Example: "SAMPLE TEXT" to "sample text"

- Title Case: Capitalizes the first letter of every word. Perfect for article titles, headings, and proper names. Example: "sample text" to "Sample Text"

- Sentence case: Capitalizes only the first letter of each sentence. The standard format for body text and paragraphs. Example: "SAMPLE TEXT" to "Sample text."

- tOGGLE cASE: Flips the case of every letter. Uppercase becomes lowercase and vice versa. Handy for fixing text typed with caps lock on. Example: "Sample text" to "sAMPLE TEXT"

Works Everywhere
- Text inputs and textareas: transformed in place with proper event handling so form frameworks (React, Vue, etc.) pick up the change
- Rich text editors (contenteditable): replaces selected text in editors like Gmail compose, Notion, WordPress, and more
- Google Docs: copies the transformed text to your clipboard so you can paste it back
- Non-editable page text: displays the result in the popup with a one-click copy button

Additional Features
- Dark & Light Theme: Toggle between dark and light mode with your preference saved across sessions
- One-Click Copy: Copy transformed text to your clipboard instantly
- In-Place Replacement: No round-tripping to an external converter, text is modified right where you selected it
- Auto-Inject: If the content script isn't loaded yet, the extension injects it automatically no page reload needed
- Clean, Minimal Interface: No clutter, no ads, no account required

Who is this Extension for?
- Writers formatting headlines, blog posts, and articles
- Developers cleaning up text in documentation or code comments
- Students formatting titles for papers and citations
- Social media managers formatting post copy
- Anyone who's ever typed a whole paragraph with CAPS LOCK ON

How to Use
- Select text on any webpage (or switch to Direct Input mode)
- Click the TextCaseConverter icon in your toolbar
- Click the case transformation you want
- Done! Text is replaced in place, or shown in the popup if non-editable

TextCaseConverter is fast, lightweight, and requires no sign-up. 
It works entirely in your browser with ZERO external servers. Transform your text in one click, right where you need it.