What is your photo telling people?
A photo from a phone usually carries the exact spot it was taken, the second it was taken, and which device took it. Post it and all of that goes with it. Drop your pictures here to see what is in them, and take it out.
It would be a poor privacy tool that sent your photos somewhere to check them. These are read here, in this tab, and nothing leaves the device — you can turn off your connection and it still works.
What gets removed
Everything a camera or an editor writes alongside the picture: the GPS position, the date and time, the make, model and serial number of the camera, the software used, and any captions or credits. The picture itself is not touched. For a JPEG the metadata blocks are cut out of the file and the compressed image data is copied across byte for byte, so the photo you get back is pixel for pixel the one you put in.
That is worth knowing, because the usual way to strip metadata is to open the photo and save it again, which quietly re-compresses it and loses a little quality every time.
What it cannot do
It cannot remove what is visible in the picture. A street sign, a house number, a reflection or a screen in the background stays exactly where it is. For those, the image tool can blur or black them out, and hide faces automatically.