Felo

Uppercase and Lowercase Text Converter Online

Convert text between uppercase and lowercase while preserving its spacing, punctuation, and line breaks. Choose the direction explicitly and receive ordinary copyable text, with unsupported characters left unchanged. Try it online.

What is Uppercase and Lowercase Text Converter Online?

Uppercase and Lowercase Text Converter Online changes the letter case of text. Ask for uppercase to turn lowercase letters into uppercase, or ask for lowercase to turn uppercase letters into lowercase. The conversion changes letter case; it does not translate words or change the writing style.

For example, uppercase conversion changes Good morning! to GOOD MORNING!. Lowercase conversion changes READY? to ready?. Spaces, punctuation, digits, and line breaks stay in their original positions. The result is ordinary text in a response block that you can select and copy.

Key Features

Uppercase conversion using a deterministic case-conversion operation.
Lowercase conversion as a supported reverse direction.
Preservation checks for whitespace, punctuation, digits, and other non-letter characters.
Clear handling of ambiguous directions and of characters whose case behavior depends on runtime Unicode rules.

How to Use

Paste or type the text you want to change.
Specify uppercase or lowercase. If you omit the direction and it cannot be inferred, the Agent asks which one you want.
Copy the converted text from the response block.

Example Use Cases

Convert a sentence to uppercase for a heading: Project update becomes PROJECT UPDATE.
Convert an all-caps email subject to lowercase: MEETING MOVED TO FRIDAY becomes meeting moved to friday.
Change the letter case of a multiline announcement while keeping its line breaks and punctuation.

Tips for Best Results

Include the direction in the same message as the text.
Put text in a code block when its line breaks or leading and trailing spaces matter, and say to preserve them.
For very long content, send manageable sections; do not assume a missing portion can be recovered.

FAQ

What input can I use, and are there limits? Send text directly in your message. There is no source-evidenced fixed character limit for the Agent; very long messages may exceed platform limits, so split them into sections if necessary. Empty input cannot be converted.

How accurate is the result? The Agent uses a deterministic uppercase or lowercase operation and checks that non-letter content and whitespace are retained. Unicode case rules can have language- and runtime-specific behavior, so the result is not a guarantee of identical output in every software environment.

How does this compare with the original source page? The source page presents two text areas and describes uppercase conversion; its supplied algorithm also contains a lowercase reverse function. This conversational tool covers those evidenced directions by returning a copyable response, rather than reproducing the page's graphical interface or its unrelated links and feedback controls.