A useful watermark is visible enough to communicate ownership or review status, but not so loud that it becomes the subject of the image. Consistency matters more than maximum size.
Size relative to the image
A fixed 40-pixel logo is tiny on a 6000-pixel photo and enormous on a 320-pixel thumbnail. Use a percentage of image width for logos and a percentage of the shorter edge for text. Relative sizing keeps mixed-resolution batches visually aligned.
Start with a logo around 12–20% of image width, or text around 4–7% of the shorter dimension. Adjust for the complexity of the mark and the intended display size.
Lower opacity, then test on light and dark areas
An opacity around 55–75% is often a practical starting point. A white mark may disappear over bright highlights, while a dark mark may disappear in shadows. Check more than one image from the batch before applying the rule everywhere.
Transparent PNG or WebP logos usually produce cleaner results than a logo with a baked-in rectangle. If the logo includes very fine lines, test the final resized output to ensure they remain legible.
Choose placement based on the job
Corner placement preserves the center of an editorial or product image. A centered mark is harder to crop away but more intrusive. Tiled text is useful for proof sheets and review copies where discouraging unapproved use is more important than an unobstructed view.
Keep a margin from the edge. A watermark that touches the border can look accidental and may be clipped by later layout cropping.
Keep expectations realistic
A watermark is communication, not copy protection. It can be cropped, painted over, or removed with editing tools. Keep original files and licensing records; use the mark as one layer in a broader publishing workflow.
The Image Batch watermark tool applies text or a logo with relative size, 0–100% opacity, rotation, margins, placement presets, and optional tiling. You can also drag, rotate, and resize the mark directly on the image. Processing is local, so private proofs do not need to be uploaded to a watermark service.
For a step-by-step workflow, see batch watermarking photos with a logo. If your final export needs to keep transparent pixels, read the batch conversion and transparency checklist.