Can I watermark a whole batch at once?

Yes — up to thirty images per task. Because the sizing is proportional, they come back consistent even when the originals are all different dimensions.

Does the logo need a transparent background?

It works best with one, and transparency is preserved. A logo on a solid white square will be composited as a white square.

Will a photo come back rotated the wrong way?

No. Photographs from phones carry an orientation tag rather than being stored the right way up, and that tag is applied before the mark is placed — so the watermark ends up where you asked for it in the picture as you see it.

Watermarking that lands in the same place on every image

Text or a logo, sized as a share of the picture rather than in fixed pixels, so a batch of mixed sizes comes back consistent.

Updated 20 August 20263 min read

Everything is a percentage, not a pixel count

A watermark specified as "24 pixels tall" is enormous on a thumbnail and invisible on a 6000-pixel photograph. Since a batch is rarely all one size, fixed measurements are how you get thirty images back with thirty different-looking marks.

So every measurement here — the type size, the logo width, the margin from the edge — is a proportion of the image it is being placed on. Set it once, and a phone screenshot and a full-resolution camera file come back looking like they were marked by the same hand.

Text or a logo

Text is drawn as vector artwork and composited, so it stays crisp at any output size rather than being scaled up from a bitmap. You choose the family, the weight, the colour, the opacity and the rotation.

A logo is a second image you upload alongside the batch. It is scaled to your chosen share of the target width, never past the width of the image it sits on, and its own transparency is preserved — the opacity control scales the existing alpha rather than replacing it with a flat rectangle, so a logo with soft edges keeps them.

Anchor: Any of the nine positions — corners, edge centres, or the middle.
Offset: How far in from that anchor, again as a proportion of the image.
Tile: Repeats the mark across the whole picture and ignores the anchor, which is the point of a mosaic.
Blend: How the mark mixes with the pixels underneath, for marks meant to sit into the image rather than on top of it.

What it will not do

A visible watermark is a deterrent, not protection. It says who made the picture and makes casual reuse awkward; it does not stop a determined person with an editor. It is also not a digital signature — nothing is embedded invisibly in the file.

The output keeps the format it arrived in, so a PNG with transparency stays a transparent PNG and an animated GIF still animates with every frame marked.

Frequently asked questions

Can I watermark a whole batch at once?: Yes — up to thirty images per task. Because the sizing is proportional, they come back consistent even when the originals are all different dimensions.
Does the logo need a transparent background?: It works best with one, and transparency is preserved. A logo on a solid white square will be composited as a white square.
Will a photo come back rotated the wrong way?: No. Photographs from phones carry an orientation tag rather than being stored the right way up, and that tag is applied before the mark is placed — so the watermark ends up where you asked for it in the picture as you see it.