Checks a JPEG or PNG for two common ways people hide a file inside an image: data appended after the image's proper end marker, and a simple sequential least-significant-bit encoding.
Both techniques are genuinely common in tutorials and simple steganography tools — worth checking for, even though neither is sophisticated.
Drop a JPEG or PNG. Both checks run automatically; if either finds something, a download button appears.
Best-effort only. Encrypted, compressed, or more sophisticated steganography (randomised bit placement, multi-file splitting) won't be detected.