How do you change the size of a jpeg image?

how do you change the size of an existing image on your computer. when submitting images to sites often my pixel size is too large and i do not know how to change it. also when i email photos to people they receive them too large (is that the same thing?)

i know image suffers when changing pixels but sometimes that can't be helped. also when you do change pixel size to submit image does it stay that size after you send? thank you very much for helpHow do you change the size of a jpeg image?
get the ACDSee software.open the picture ---select Modify%26gt;Resize and select the pixels in the right hand pane .---then save the picture.How do you change the size of a jpeg image?
I'm not aware of any program that changes the file size of a jpeg file. What is most likely happening is your jpegs are high resolution and therefore large in size. When you attach the file to an email, it may exceed the allowable file attachment size. I suggest a way around this is to create a new file by inserting the jpeg onto a Word page. You can resize it and then save it as a Word document, which is smaller in size than the jpeg. Then attach the Word file to you email. You can't do this if you are sending the files for reprint as photos.
you can use microsoft picture manage

Start%26gt;microsoft office%26gt;microsoft office tools%26gt;microsoft picture manager

then you go to picture on the menu bar and select crop

you can select your size



or use photofiltre
Open the image with word, this way the quality will be same and you can re-size you're image :D