Despite having the most generic name ever, this is the main website i use! it offers glitter graphics, overlays, lots of text fonts, transparent backgrounds, and a lot of frames. If you like the vibe of old crappy internet graphics, stickers, blinkies, and buttons, this is for you. It saves your work in progress constantly which is really nice and is pretty easy to use.
This is a really easy to use gif maker, where you can just upload the images as frames. It's pretty simple. I used this for the furby under construction gif, which i drew in Krita, but i've heard MS Paint is a pretty good thing to use as well.
If you are familiar with the gen z old web comunity (idk what else to call it), you'll already be familiar with Blinkies Cafe! it's a website where you can add your own text to blinkie templates. it also has a good tutorial about how to make your own templates in the blog section. I don't know if asking people to credit me for the blinkies i made with blinkie cafe makes sense because anyone can recreate them and they took like 2 minutes. So i'll put them here, but if you want to use them you don't have to credit me at all.
Picmix is a website where you can make digital collages! it's used equally by middle aged women making digital greeting cards, scenemo teens, and other weirdos (me!)
I've linked an online version of MS paint, but I usually use the actual thing. My site button, banner, and other drawings of Pie were made on Paint. They've added layers recently which is extremly helpful. I use it mainly for the simple aesthetic that I can't quite mimic on my normal drawing program (Krita). I always usually use Online Image Editor in addition to MS paint to add text or glitters.