Hidden Image Watermark
Hide text inside image pixels or extract it back · runs locally
Image
How it works
Hide a piece of text inside an image — the change is invisible to the eye and the image dimensions stay the same, but this tool can read the text back. Useful for invisible signatures, source tracing or attaching hidden notes.
Embed output is always saved as PNG to preserve the full watermark signal. If the image is later re-saved as JPG and re-compressed, short text usually still recovers; long text or repeated compression may break — keep the PNG original for safety.
Everything runs locally in your browser — neither the image nor the text is uploaded.