The FAQ's are quite detailed, as Ellis states.
You do need to understand some fundamentals, like image size and pixel count and image compression.
I just a google search for "jpg file resize" and got many hits.
One was a web site which will convert. See URL link. This was a very easy site to use. A few seconds to get a resized file and it shows the file size before saving.
For people with Windows XP, this is another option. More mouse clicks, but useful.
Locate the JPEG file you wish to resize. Select it and right-click.
Find the "Send To" tab, and locate "Mail Recipient." Click on this.
A new window titled, "Send Pictures via E-Mail" will pop up. The two options listed are "Make my Pictures Smaller," or "Keep the Original Sizes." Select "Make my Pictures Smaller" and hit "OK." NOTE: For more detailed compression options, click the "Show More Options" tab in the bottom left-hand corner of the window. You can choose between three possible reduction rates. Hit "OK" when finished.
An e-mail message will pop up with your resized JPEG as an attachment. Send it to the recipient of your choice.
If you want to save a copy of your resized JPEG file, go to the "File" tab in the top left corner of the e-mail message window, and select "Save Attachments." Choose the location to save the new file and hit "Save."
Download Image Resizeravs4you.com/AVS-Image-Converter
Resize & Convert Bulk Images JPEG TIFF GIF RAW BMP JPG PCX etc.
Read more: How to Resize JPEG Files Using Windows XP | eHow.com http://www.ehow.com/how_2128222_jpeg-files-using-windows-xp.html#ixzz1WEfoJaio