I'm trying to upload pictures to a website, and it says "maximum size 1000x700" my pictures are all around 1740x1120 how do I reduce them?

Moderator Edit: Moved topic to more appropriate forum. ~ Animal

This program - Irfanview - has been mentioned as an excellent, free program that will do what you ask, and a lot more.

Try one of these tutorials.

Using Paint To Adjust The Size Of An Avatar
Resizing An Image Using Irfanview

There are two methods.
1: cropping
2: resizing

When you crop you are literally cutting out part of the image, which can make the image smaller if you remove the outside.
This can be done easily in paint, or virtually any other image editing software and some none image editing software like MS word.

Resizing is taking your image and changing it by condensing pixels together or separating them out so that the image is larger or smaller.
This can distort the image or cause loss in quality. Once again, there are many types of software able to do this from Irfan, to Photoshop, to even MS word...

If you want a step by step tut. let me know which method, what imaging software you have, and I'll write something up real quick.