photoshop could do that easily.
just set up an action, then put all the gifs in a folder and run the action as a batch process on the whole folder.

welcome to WebmasterWorld, OceansTech!


IrfanView will also do that.

Hello OceansTech and welcome to the forums. I've used Irfanview which is a free program to do this on Windows, or you can use GIMP (also free) for the job. GIMP works on Mac or Linux too. One tip - never work on the originals - use a copy of the folder full of images in case you need to redo the job.

For Mac, GraphicConverter also works. Don't remember if batch conversion can still be done in the free version. It puts up loud warnings if you want to replace material in the same file-- but if you're concurrently renaming (that includes changing the extension only) this won't be a concern.

A different question is whether gif to jpg is the best remedy. If the information has already been stored in gif format, converting to jpg may make a bigger file. If the images have distinct, clearly defined color areas-- for example if they started as vector images or there's text-as-graphics-- png may be more efficient. Same if the originals are indexed (256 colors or less), which they'd have to be in gif format.

Irfanview will let you reduce the color depth for a batch file while you are renaming, resizing, or other tasks. If this is to reduce file size (kb not dimensions) you might want to do a few trial tests with a few images to see how low you can go for best results of filesize vs. quality. Just converting the format will be likely to create a larger filesize as lucy24 says. Often jpg can use 16 bit or even 8 bit color for smaller (faster loading) file size.

Use any image manipulation software, open the file and save as .jpg file.

In linux or x__xBSD you could easily crank out a shell
script to loop through all GIF files in a directory -- doing
convert $whatever.gif $whatever.jpg
using `convert` from the imagemagick package.