Watermark

Watermark adder

Mark your product photos before a competitor reuses them.

Product photography posted unmarked on Alibaba or sent in a sample pack gets lifted and reused by competitors and resellers passing your goods off as their own listing. A watermark does not stop a determined copy, but it raises the friction and makes the origin obvious when the image turns up elsewhere.

Drop a product photo and set the watermark text, colour, and opacity, and the tool burns a diagonal centre-placement mark in your browser, nothing uploaded.

Last updated 2026-05-09. Math runs in your browser, no data leaves your computer.

JPG, PNG, or WebP up to 8 MB. The image never leaves your browser; the watermarking runs locally.

Your domain or company name reads best. It is what tells anyone who finds the image elsewhere where it came from.

Around 40% is the sweet spot: heavy enough to survive a screenshot, light enough that the product still reads clearly.

White over dark products, black over light ones. Sourzi red if you want the mark to carry the brand.

A diagonal mark near -30 degrees is hardest to crop out without losing the product.

JPG for catalogue and email, PNG when you need lossless, WebP for the lightest web file.

General guidance only. Verify against the cited primary sources before you commit to a shipment, declaration, or contract.

A worked example

The booking. You send a clean, unmarked set of your best product photos to a first-time inquirer on Alibaba to win the sample order.

The failure. Three weeks later your own photos turn up on a competitor's listing, passing your goods off as theirs, and you have no easy way to prove they were yours first. Unmarked images travel fast and lose their origin the moment they leave your outbox.

The fix. Run the set through here first, a diagonal mark at 40% with your domain across the centre, before anything goes out. The product still reads clearly for the buyer, and if the image surfaces elsewhere the origin is written right across it.

Need the same photos sized consistently for the listing first? The batch image resizer does it at /tools/image-and-content/batch-image-resizer.

Turning the marked photos into a sellable sheet? The catalog builder assembles them at /tools/image-and-content/catalog-builder.

Frequently asked

When should I watermark product photos?

Before sending samples to first-time inquirers, before posting on Alibaba or Made-in-China, when sharing on a public RFQ board. Watermarking discourages a competitor from grabbing your photos and using them in their listings; it does not prevent it but raises the friction enough that most lazy copying stops.

What watermark settings work?

Diagonal text watermark across the centre at 40 to 50% opacity, white or red text, font-size proportional to image width (about 6%). Hard to remove without losing image quality; soft enough that the product is still clearly visible.

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