Frieza Form 1 -
This form is Frieza is small and purple, white and pink. This is Frieza's weakest form. In this form, he is at a PL of 500,000. Not much else to say about this form.
Frieza Form 2 -
In this form, Frieza has long black horns curving out to the sides and then sticking straight up. He is very big and bulky in this form. Every muscle in his body increases and this increases his speed and strength. He is in his tallest form.
Frieza Form 3 -
Frieza is very ugly in this form. His head is stretched out to the back and he has two white horns on each side of his head. The horns stick out to the side and curve up just a bit. He isn't as bulky as Form 2 in this form. The plates on his shoulders stretch out. They still have a purple top just like his head. His strength increases at this stage but his speed stays the same.
Frieza Form 4 -
Frieza's 4th form is much different than the others. He has no protection or pink skin anywhere. His breastplate is putple, the top of his head is purple, and his forearms are purple. And he has purple srtipes down his cheeks. The rest of him is white. In this form Frieza becomes shorter and his face changes. His strength and speed greatly increase but he is quite small in this form. His tail is all white now. He can go up to 100% which is his maximium power. His muscles grow bigger when he raises his power percentage. His speed does not decrease from his muscle mass. While fighting Goku, he only goes to 1%, 50% and 100%.