How to use this tool:

1. Upload an image by clicking the "Choose Image" button or dragging and dropping an image file
2. Set your desired thumbnail size using the width/height inputs or preset buttons
3. Choose the shape and format for your thumbnail
4. Adjust quality and other options as needed
5. Preview the thumbnail in the right panel
6. Click "Download" to save your thumbnail

Tips:

• Check "Maintain aspect ratio" to prevent image distortion
• Use PNG format for transparent backgrounds
• Lower quality settings reduce file size but may affect image clarity
• Watermarks can help protect your images