Image Watermark
Upload a photo and enter text to preview instantly, then add your watermark by choosing the font, color, size, opacity, and layout. Photos are never uploaded and are processed only in your browser.
How to use
- Drag and drop or click to choose a photo.
- Enter the watermark text and choose the layout, font, color, size, and opacity.
- Check the preview, then save with "Download".
Frequently asked questions
Are my photos uploaded to a server?
No. Photos are not sent to a server and are processed only with canvas in your browser. The result is saved directly to your device.
Which layouts can I use?
You can choose a full tiled repeat (with adjustable density), center, bottom-right corner, or bottom placement, and turn on a diagonal tilt.
What about the output image quality?
It saves as PNG at the original resolution. Very large images may be slightly scaled down for processing speed.
Practical example and verification criteria
Image Watermark: First check the source format and dimensions and whether transparency, animation, or metadata must be preserved. Resizing, file compression, format conversion, and watermarking are different operations, and JPG cannot preserve transparency. Choose output format and quality for the actual publishing environment.
Image Watermark: For a quick check, start with 1920×1080 + opacity 20% as a small input whose result relationship you can verify directly. Confirm that the input summary, units, and options match your intent before applying the tool to real values or a copy of the source; this reduces setup mistakes.
Image Watermark: Reopen the result and compare pixel dimensions, format, file size, transparent areas, edges, and text sharpness with the source. Browser Canvas re-encoding may not preserve EXIF, ICC profiles, or animation, and large files consume device memory. Keep important originals separately and test a small number of files first.
Image Watermark · Work record: For real work, record the input conditions, selected options, and result together. Do not assume the same state will remain after a refresh or device change. Preserve important results separately using copy, download, a screenshot, or another method the page supports, then reopen them in the target environment.
Image Watermark · Error check: If an error or unexpected result appears, reduce the input, run again with default options, and then change one condition at a time. Recording error messages and boundary values helps distinguish format issues, unsupported cases, and browser resource limits, and prevents an empty result from being mistaken for success.
Image Watermark · Scope of use: Check the page guidance for browser processing versus server lookup, storage location, and supported scope. Use sensitive source material or secrets only when strictly necessary. High-impact work such as legal, financial, or medical decisions or changes to an operational system requires current authoritative information and a separate verification process.