Key Features:

1. FASTA format support with header preservation
2. Three operations: Reverse, Complement, Reverse-Complement
3. Automatic sequence cleaning (removes non-DNA characters)
4. Case-insensitive processing (maintains uppercase output)
5. Clean, responsive design
6. Error prevention with input sanitization

How to Use:

1. Paste DNA sequence(s) in either raw or FASTA format
2. Click desired operation button:
   • Reverse: Reverse sequence order
   • Complement: Generate complementary strand
   • Reverse-Complement: Generate reverse complementary strand
3. Results appear below with original FASTA headers preserved
4. Use Clear button to reset

Handles:

• Mixed case input (outputs uppercase)
• Multi-sequence FASTA files
• Invalid characters (automatically filtered)
• Large sequences (browser performance dependent)

The tool follows standard molecular biology conventions for DNA sequence manipulation, matching the functionality of professional bioinformatics tools while maintaining simplicity for educational use.