Invert Case Converter (Swap Letter Case)

Invert letter casing across text, converting uppercase to lowercase and lowercase to uppercase.

How It Works & Processing Standards

Invert letter casing across text, converting uppercase to lowercase and lowercase to uppercase.

Your input data is never sent to any server and is securely processed on your device.

Current Limits

  • Maximum input length: 2,000,000 characters

Invert Case Converter (Swap Letter Case) is a 100% free, browser-based online utility. All calculations and file conversions run locally inside your browser (Local-First) without sending data to remote servers, keeping your documents and inputs strictly private.

How to Use Invert Case Converter (Swap Letter Case)

  1. 1
    Paste TextEnter text with mixed casing.
  2. 2
    InvertEach letter flips its casing.
  3. 3
    CopySave the inverted text.

Common Use Cases

  • Fixing text accidentally typed while Caps Lock was active
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