For opaque paint, use LaMa on Hugging Face:
Once you have the unhidden text, run it through a standard online OCR (like OnlineOCR.net) to convert the recovered image text into copy-pasteable characters. This serves as your verification step – if the OCR reads coherent words, you succeeded.
For free, verified, online AI to unhide painted screenshot text:
Final recommendation: Combine AI inpainting + OCR + human verification. Do not rely on a single tool for sensitive restoration.