When this tool is useful
Preparing previews, portfolio images, proofs, and shareable drafts with a visible ownership or status mark.
How local processing works
The image is decoded to a canvas, text is drawn with opacity and rotation, and a new image is encoded in the source format.
How to use it
- Choose the source files.
- Review the available settings and page order.
- Process locally, inspect the result, and download it.
Important limitations
Output is re-encoded and metadata is not preserved. A visible watermark can be cropped or edited and is not cryptographic ownership proof.
Private by design
Your files stay in this browser. The tool does not upload the source or output to our servers.
Questions and answers
Does this tool upload my files?
No. Processing happens in your browser; closing the page clears the working session.
Will the output always match the source exactly?
Output is re-encoded and metadata is not preserved. A visible watermark can be cropped or edited and is not cryptographic ownership proof.
Concrete input and output example
Input five 2400×1600 JPEG proofs, add a 35% opaque text mark near the bottom end, and export new images. The visible mark is baked into pixels and the re-encode may discard metadata or add JPEG loss.
Browser compatibility notes
Reviewed against the implementation and required web APIs on 2026-08-12. Use a current browser where these APIs are available and verify important output on your device.
- Chrome / Edge (current desktop)
- Requires local decode, canvas, encoding, Blob download, and enough memory; verify the downloaded image.
- Firefox (current desktop)
- Uses the same standard local APIs; color rendering can differ slightly from Chromium.
- Safari (current desktop)
- Uses canvas and Blob downloads; available memory and codec behavior remain WebKit-controlled.
A tool-specific question
Can the watermark be removed later?
The download has the mark baked into pixels, but visual marks are not secure rights management. Keep an unwatermarked original and do not rely on the mark alone.