Invert Text Case
Flip the case of every letter. Uppercase becomes lowercase and vice versa.
What is the Invert Text Case Tool?
The Invert Text Case tool (also known as Toggle Case or Flip Case) swaps the case of every letter in your text. Uppercase letters become lowercase, and lowercase letters become uppercase, creating unique visual effects and fixing case-inverted text.
Premium Features
Instant Case Flip
Swaps every letter's case in real-time.
File Upload
Load .txt files (up to 1MB) and invert entire documents.
Batch Mode
Process multiple lines independently.
Common Use Cases
Creative Text Effects
Create unique visual text styles for social media posts, graphics, and design projects. Stand out with unconventional casing.
Sarcasm & Mockery Text
Create alternating case text (aLtErNaTiNg CaSe) popular for expressing sarcasm or mockery in internet culture and memes.
Fix Inverted Text
Quickly fix text that has been accidentally inverted or has incorrect casing patterns by flipping it back to normal.
Testing Applications
Test how case-sensitive applications, databases, or search functions handle varied casing patterns and edge cases.
Need More Case Styles?
Try our All-in-One Case Converter with 6 styles, Batch Mode, and Comparison View.
Explore All Case Options →How It Works
Simple Rule:
- ✓ Uppercase (A-Z) → becomes → lowercase (a-z)
- ✓ lowercase (a-z) → becomes → Uppercase (A-Z)
- ✓ Numbers & Symbols → remain unchanged
Example
Frequently Asked Questions
What is invert case or toggle case?
Invert case (also called toggle case or flip case) swaps the case of every letter in your text. Uppercase letters become lowercase and lowercase letters become uppercase. For example, 'HeLLo WoRLd' becomes 'hEllO wOrlD'.
When would I use invert case?
Invert case is useful for: creating unique visual text effects, fixing text that has inverted case, aesthetic text for social media posts, creating sarcasm or mockery text (aLtErNaTiNg CaSe), testing case-sensitive applications, and creative typography.
Does it only flip letters or other characters too?
The tool only inverts the case of letters (A-Z, a-z). Numbers, punctuation, spaces, and special characters remain unchanged. This ensures your text structure stays intact while only letter casing is flipped.
Can I upload a file to invert case?
Yes! Click the Upload icon to load a .txt file (max 1MB). The tool will invert the case of all letters in the file. You can then download the result using the Download button.
What is batch mode for invert case?
Batch mode processes each line independently. This is useful when you have multiple separate texts or messages that each need their case inverted while maintaining line structure.
How is invert case different from other case converters?
Unlike Uppercase (all caps) or Lowercase (all small), Invert Case flips each letter individually. It's not about making everything the same case, but about reversing the existing case of each letter independently.
Is my text saved or stored?
No. All conversion happens 100% client-side in your browser. Your text never leaves your device, ensuring complete privacy and security.
Is this invert case converter free?
Yes, completely free with no registration, hidden fees, or limitations. Use it for personal or commercial projects.