How do I make a PNG file smaller?

Related questions

1. How do I compress audio files?
2. How do I compress file size?
3. How do I reduce audio file size?
4. How do I compress a compressed file to make it smaller?
5. Can I compress an already compressed file?
6. How do I compress a JPEG to 50kb?
7. How can I compress the size of a JPEG?
8. What is the pixel size for 20 KB?
9. How do I compress a video to email it?
10. How do I send a large video from my iPhone?

Tags

1. #press
2. #group
3. #window
4. #image
5. #resize
6. #click
7. #navigational