Photos stuck on glass.

Buy one of those blades that are used to clean a ceramic stove top and scrape the worst of the photo off. I assume you are willing to loose the photo. Then use Goo Gone to get the rest of the paper off. You could also use it before you start scraping.

Have you tried heating the back of the glass with a blow dryer. That may loosen it up some so it peels off easily.

I also suggest taking a photo of the photo first. You may not get it off in one piece.

Perhaps soaking the whole thing in water will help peel to picture off with less loss of the picture. But first, I'd do what Janey B. said and take a picture of it first.

Take them to a photo store, , they will be able to help you.

Do you wish to save the photos... Or the glass? Using a spray of water or damp towel placed on back of the photos for a time should soften them enough to scrape off with a single edge razor. Or soaking the glass in a basin of water will remove them but may damage them. Saving the photos might include carefully breaking away the glass from the photos and picking out the glass pieces with a tweezers.

I've read that dental floss works.

Turn the hair dryer on a low setting and hold it about 5 inches from the photo's surface. You don't want it to overheat. This should loosen the picture from the glass. Then, very slowly and very carefully, pull the corner or the side of the photo until the whole picture is taken off.

Use A Hair Dryer

Set your blow dryer to a low heat setting and hold it about 7 inches away from the picture for five minutes. As you blow warm air on it, the adhesive will loosen, and you should gently pull on the corner of the photo until you remove the entire photo. It is also important to not apply too much heat to the picture as it might lead to further damage.

Use A Freezer

If you don’t have a hair dryer, you can try this second method. Put the photo frame in the freezer for a few hours and then take it out. The cold temperature will make the adhesive brittle and then you can gently pull on the photo and unstick it. You should also make sure you wear rubber gloves to protect your hands in the event glass breaks as you remove the photo stuck to the glass.

Use A Credit Card

You can try using a credit card. Put the photo frame face down on a flat surface. Insert the edge of the credit card between the glass and the photo. Gently push the card until you can feel that the adhesive has been cut. Then, carefully peel off the picture. Be careful not to damage the photo while doing this.

Use Warm Water

This is the easiest method and will work on most photographs. First, fill a bowl with warm water. Next, soak the photograph and glass in the water, making sure they’re completely submerged. As they soak, the adhesive should loosen and the picture should separate easily.

After you’ve taken them out of the water and managed to separate them, set them down on some paper towels for about an hour. The emulsion will dry up and make them much more stick-free as a result of this procedure.