A watermark that stays readable
Choose a short label and a colour that contrasts with the part of the image behind it. White text works on a darker photo; black text can read better over a bright background. If the label is distracting, reduce its opacity rather than making it too small to read.
Text size is expressed as a percentage of image width. This keeps the watermark’s relative size similar when a batch contains photos with different pixel dimensions. Long labels are reduced to fit within the image width, so short names usually produce clearer results.
Corner or centre placement
A corner label keeps the main subject unobstructed, but it may be easy to remove by cropping. A centred label is more visible and harder to crop around without changing the composition, though it also covers more of the picture. Choose the placement that suits how the image will be used.
The tool adds visible text only. It does not create an invisible watermark, attach legal registration or prove who owns an image. A visible mark can discourage casual reuse, but it is not tamper protection and can be edited or removed by someone with image-editing tools.
PNG and JPG output
PNG output preserves transparent areas and does not add lossy image compression. JPG uses a high-quality lossy save and fills transparent areas with white. The input can be JPG, PNG or WebP; the output format is selected in the settings panel.
Watermarking renders a new image, so original hidden metadata such as EXIF details is not copied. Very large images may be reduced to fit the browser’s canvas limit; the result notes when this happens. Keep original images if you need their full resolution or metadata later.
For a size limit after adding the label, use Compress Image. To change dimensions first, use Resize Image. Use Remove Image Metadata when your task is hidden-metadata cleanup rather than adding visible text.