How to use Invisible Watermark
Hide text inside an image’s pixels, exporting a PNG that looks unchanged; load that PNG later to read the text back. Free, runs locally.
- Input
- A PNG, JPG or WebP image and up to 2,048 UTF-8 bytes of text
- Output
- A PNG with the hidden text, or the text read back (also as TXT)
- Processing
- Processed in your browser; your input is not uploaded
- Choose write or read mode.
- To write, choose an image and enter text such as a signature or serial number; to read, choose the original PNG exported by this tool.
- Generate and download the PNG, or copy the text that was read. Share the original file as it is.
FAQ
Can it still be read after messaging-app compression, screenshots or cropping?
Not reliably. This is a pixel-level watermark for lossless original files; compression by messaging and social apps, scaling, screenshots, cropping or color edits can destroy it, so send the original file. It is not a compression-resistant copyright tracking system.
Is the hidden text encrypted?
No. Anyone using this tool can read a compatible watermark, and could overwrite it. It cannot prove authorship or copyright on its own, and passwords or sensitive information should not be written into it.
Can it read watermarks made by other software?
It only reads ToolMelo’s current format. Exports are always PNG, with transparent areas filled white; the RGB channels change by at most one level, which is usually invisible.