How do I update an old tile backsplash without removing it?

Hi Adrianne! The old tile has to be removed before installing new tile. But there's another option that is inexpensive and easy that another Hometalker just told me about that he used. You can install a faux tin backsplash over tile using construction adhesive. The panels are made of PVC but are safe for behind the stove if it has a control panel at the back burners (not a slide in or drop in unit). It comes in different metallic finishes. Here's the link to one of the finishes https://www.homedepot.com/p/Fasade-24-in-x-18-in-Traditional-10-PVC-Decorative-Backsplash-Panel-in-Oil-Rubbed-Bronze-B57-26/100625482 In the questions and answer section of that link, the manufacturer says you can install the panels over tile if the surface is free from grease so the adhesive will work.

Here's some info on how to paint a tile backsplash: https://brepurposed.porch.com/2017/09/21/paint-tile-backsplash/

I wouldn't recommend tiling over it without removing the previous layer.

You may be able to attach faux brick to this surface. Take a picture on your iPhone and take to your local big box hardware store. Check with the salesperson on the product (glue, ?tiles, etc) you will need to purchase to do this transformation. There are also faux copper and silver tiles you may consider using. These are easily cut. Make a pattern first. Check size for project with “pattern”. Once you have determined what you want to use you can begin your project. Be sure and clean the project surface real good and let air dry completely before starting your project. Make sure your pattern fits!!!!

Tiling over tile is not advisable as if anything happens to the first layer, it’ll ruin the new one costing you more money and time in the long run. You can paint the tile, maybe consider a stencil or cover over them with a new material. You can even try a skip coat concrete.