Brodidit can place a caption along the bottom inside the photo. It does not add a new band beneath the picture.
This is an overlay caption: it covers part of the image rather than adding canvas space. Keep important subjects away from the bottom text area and try an outline when the background changes colour behind the words.
Illustrative example: add a place and date as a short bottom caption on a travel photo. Check that descenders and long words fit in the saved output, and keep a clean original for future changes.
A true caption below the image needs a layout editor that expands the canvas and adds a separate strip. There is no band, frame or free-position control here; do not use this tool if preserving the entire picture unobstructed is required.
The caption is placed along the bottom edge, inside the photo. The default size of 9 percent of the picture height is a good start, and the outline keeps white text readable even on a pale area. On a dark photo, yellow or white both stand out well.
Keep it to one short line, because a long one is squeezed to fit and the letters become small. Look at the preview at a small size before you save, to be sure that it still reads and that it does not cover something important such as a face.
No. The current tool places text inside the existing image.
Text is baked into the pixels. Keep the original and recreate the caption if needed.
Yes. The size runs from 4 to 18 percent of the picture height, and it scales with the photo so it keeps the same proportions.