Practical image tasks
Watermark a set of product photos: test the awkward one first
Apply a consistent mark to wide, tall and small product photos, then check skipped files, formats and the downloaded ZIP.
Ten product photos are going to a partner for review. Some are landscape, some portrait, and one is a tiny thumbnail. If you design the watermark on the easiest wide image and apply it to everything, it may cover the subject in a portrait and dominate the thumbnail. Start with the awkward files.
Build a three-image test
Open Batch Image Watermark and add one light landscape photo, one dark portrait and the smallest image. Add a text or logo layer. “Preview” or a project name is often enough; avoid putting a customer's phone number or other unnecessary personal details into the mark.
Choose a corner with some margin and lower the opacity. Cycle through the three previews. Is the mark visible on the light image? Does it shout on the dark one? Does it cover an important detail on the portrait? A fixed pixel size can overwhelm a small photo. A size relative to image width is often a better starting point for mixed dimensions, but it still needs checking.
Watch the files that were skipped
Once the sample works, add the remaining photos. The tool has batch options and exclusion conditions: a small image, a particular orientation or an unselected file may be skipped. Check selection and filters before processing. Afterwards, compare the completed, skipped and failed counts. If ten files went in and nine came out, find the missing one before sending the ZIP.
“Keep original format” means the output format follows the source; the browser still redraws and exports the image, so the result is not byte-for-byte identical. Converting a transparent PNG to JPEG removes transparency. PNG output may be substantially larger. Choose a format the recipient can open and a file size they can handle, then check the actual download.
Inspect the files you will send
Download a sample or the ZIP and extract it. At minimum open a landscape image, a portrait, the smallest file and a visually busy image. Check at 100% zoom for clear text, then at the size the recipient will actually see. Make sure the watermark does not hide the subject. Confirm filenames and keep the original photos in a separate folder.
A visible watermark labels a version or source. It cannot stop someone from cropping, covering or re-exporting the picture. For unreleased products or private portraits, control who receives the files as well.