Case Converter

Fast case conversion with PicoToolkit

Change letter case for any block of text in one click. PicoToolkit’s Case Converter offers common options (lowercase, UPPERCASE, Title/Capitalized case and inverse/alternate case) so you can normalize data, fix accidental Caps Lock, or prepare content for analysis.

How to use

• Paste or type your text into the editor above.
• Choose an action: lowercase, UPPERCASE, Capitalized / Title case, or Alternate / Inverse case.
• Apply the conversion and copy the result back to your document or workflow.

What each option does

• Lowercase — converts all letters to lower-case (a → a).
• Uppercase — converts all letters to upper-case (a → A).
• Capitalized / Title case — makes the first letter of each word upper-case and the rest lower-case (example: "hello world" → "Hello World").
• Alternate / Inverse case — swaps the case of each letter (a → A, A → a).
• Non-letter characters (numbers, punctuation, symbols) are left unchanged.

Examples (copyable)

Lowercase

Input:
This IS Some Text.

Output:
this is some text.

Uppercase

Input:
This is some text.

Output:
THIS IS SOME TEXT.

Capitalized / Title case

Input:
the quick brown fox

Output:
The Quick Brown Fox

Alternate / Inverse case

Input:
Hello World

Output:
hELLO wORLD

Common use cases

• Normalize text before deduplication or word-frequency analysis.
• Fix accidental Caps Lock or mixed-case pastes from other systems.
• Prepare titles or labels for display with consistent capitalization.

Tips & edge cases

• Keep a copy of the original input if you may need to revert changes — case conversion is not always reversible (e.g., title case loses original capitalization patterns).
• For accented characters or language-specific normalization, consider using Remove Diacritics if you need plain ASCII equivalents.
• If you need to change only the first letter of each line, use Capitalize the first letter.
• Combine tools: trim whitespace (Trim), remove duplicates (Remove Duplicates), then convert case to get clean, normalized lists.
• Case conversion applies per character; it does not change line order, line breaks, or non-letter characters.

Related tools

• Capitalize the first letter of each line
• Trim — remove leading/trailing whitespace
• Remove Duplicates
• Remove Diacritics
• Find and Replace

FAQ

Will conversion change punctuation or numbers?

No. Only letter case is changed. Numbers, punctuation, and other symbols remain exactly as in the input.

Does Title/Capitalized case follow language-specific rules?

Title case capitalizes the first letter of each word and lowercases the rest. It is a simple, predictable transformation and does not implement language-specific title-casing exceptions.

Can I undo a conversion?

There is no automatic undo. Keep a copy of the original text before applying large or destructive edits. You can re-run another conversion (for example, convert back to lowercase), but some original information may be lost.

Reply PUBLISH to save.