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Upper Lower

Text case converter for Chrome

is a lightweight and practical text conversion extension.

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Upper Lower

Upper Lower is a lightweight and practical text conversion extension designed to help you quickly transform text into different formats directly from your browser.

Whether you're working with content, code, documents, or forms, Upper Lower allows you to convert text instantly without leaving your workflow.

Features

Quick text conversion

Simply paste your text into the extension and choose the desired format:

  • UPPERCASE
  • lowercase
  • Capitalize (first letter of the text)
  • Capitalize All Words
  • Add hyphens
  • Remove spaces
  • Remove line breaks

The result is automatically selected, so you can copy and paste it immediately.

Right-click context menu integration

Upper Lower includes a built-in converter directly in your browser’s right-click menu. This allows you to convert selected text instantly without opening the extension manually, making your workflow faster and more efficient.

How to use

Using Upper Lower is simple:

  1. Copy any text.
  2. Open the extension popup.
  3. Paste the text into the input box.
  4. Click the desired conversion button.
  5. The result will be automatically selected.
  6. Paste it wherever you need.

Alternatively, select text on any webpage, right-click, and use the conversion option from the context menu.

Why use Upper Lower?

  • Fast and easy to use
  • Saves time when formatting text
  • Works directly in your browser
  • No complex configuration required
  • Lightweight and privacy-friendly

Upper Lower is designed to make text formatting effortless.

Support the project ☕

If Upper Lower helps you save time and improve your workflow, consider supporting its development.

This extension is built and maintained independently, and your support helps keep it updated and improve its features.

☕ Buy me a coffee on Ko-fi

Thank you for your support!

Privacy Policy

Last updated: 2026

Upper Lower respects your privacy. This extension is designed to function entirely on your local device and does not collect, store, or transmit any personal information.

Information Collection

Upper Lower does not collect, store, share, or transmit any of the following:

  • Personal information
  • Browsing history
  • User activity
  • Inputted text
  • Website data
  • Any identifiable user data

All text processing occurs locally within your browser.

Permissions Usage

Upper Lower requires specific browser permissions to provide its functionality. These permissions are used solely for the features described below.

contextMenus

The contextMenus permission is required to add custom options to the browser's right-click context menu. This allows users to quickly interact with the extension and convert selected text directly from any webpage in a convenient and efficient way.

This permission is only used to display conversion options when the user right-clicks and does not collect, store, or transmit any data.

activeTab

The activeTab permission allows the extension to temporarily access the currently active browser tab when the user explicitly interacts with the extension.

This ensures that:

  • The extension only affects the tab the user is actively using
  • No background access to other tabs occurs
  • No browsing activity is monitored
  • Privacy and security are preserved

This permission is used exclusively to perform text conversion actions requested by the user.

scripting

The scripting permission is necessary to inject scripts into webpages when required by the user’s action.

This allows the extension to:

  • Apply text conversion directly on selected content
  • Improve interaction with webpages
  • Provide a seamless and efficient user experience

Scripts are only executed when triggered by the user and are never used to collect, store, or transmit personal data.

Data Storage

Upper Lower does not store any personal or user data locally or remotely.

No analytics, tracking tools, or external servers are used.

Third-Party Services

Upper Lower does not use any third-party services, analytics providers, or external APIs.

Data Sharing

Upper Lower does not sell, share, or transfer any user data to third parties.

Security

Because Upper Lower operates entirely locally and does not collect or transmit data, user information remains fully private and secure.

Changes to This Policy

This privacy policy may be updated in the future if functionality changes. Any updates will be reflected on this page.

Contact

If you have questions about this privacy policy, you can contact the developer through the extension listing page.