Watermark
Text watermark with adjustable opacity.
This runs in your browser. Nothing is uploaded.
About Watermark
Draws a line of text across the bottom-left of your image at an opacity you set, rendered in your browser so unreleased work is never uploaded in order to mark it.
Watermarking is for images heading somewhere you do not fully control: a client proof, a marketplace listing, a portfolio PDF, a screenshot going into someone else's deck. The point is not making theft impossible, because a watermark never does that. The point is making casual reuse obviously traceable and mildly inconvenient. Which is also why handing an unreleased photo to an unknown server in order to mark it is a strange trade to accept.
Your image is drawn onto a canvas at full resolution, then the text is painted over it in bold 36-pixel Inter, in white, positioned 24 pixels in from the left edge and 24 pixels up from the bottom. The opacity slider sets the canvas alpha anywhere between 0.1 and 1 before the text goes down, defaulting to 0.7. Leave the text field empty and it writes ihateonlinetools.com instead.
The fixed 36-pixel font size is the thing to watch. On a 6000-pixel photograph the mark is nearly invisible; on an 800-pixel thumbnail it dominates. It is always white, always bottom-left, always one line. If the bottom-left of your image happens to be bright, white text at 0.7 opacity will vanish into it. Resize the image to its final dimensions before watermarking, not after, or the mark will scale with everything else.
How to use Watermark
- 1Drop one image onto the panel, or click to browse.
- 2Type your watermark text, or leave the field blank to use ihateonlinetools.com.
- 3Set the Opacity slider between 0.1 and 1, then click Apply.
- 4Click Download to save the marked PNG.
What it won't do
- Text only. No logo, no image overlay, no tiled or repeated watermark.
- Colour, font size and position are fixed at white, bold 36 pixels, bottom-left.
- One image at a time — use batch watermark for many files.
Common questions
Can I use a logo image instead of text?
No, this places text only. There is no second image input and no logo upload, so a graphical mark is out of scope here. If you need a logo composited onto a photo, the merge tool will place two images next to each other, though not one on top of the other.
Can I change the watermark's colour, size or position?
Not on this page — the mark is fixed at bold 36-pixel white in the bottom-left corner, and opacity is the only control. The add-text tool gives you a colour picker and a size slider from 12 to 120 pixels, with a black outline for legibility, if those matter more to you than opacity.
How do I watermark a whole folder of photos?
Use batch watermark, which applies the same text to every image you load and returns them as a zip. The batch version uses a fixed white at 70 percent opacity and a 28-pixel font rather than exposing an opacity slider, so it trades control for throughput.
Will a watermark stop people stealing my images?
No, and anything claiming otherwise is selling you something. A visible watermark can be cropped, cloned out, or in many cases removed by software in seconds. What it does is make unattributed reuse visible to third parties and raise the effort enough to deter the laziest copying.
Related tools
Why this one doesn't upload your file
There is no server to upload to. This page is a static file, and the work happens in your browser using the same graphics and WebAssembly code that renders every other site you visit. Your file is read from disk into memory, processed, and handed back as a download. Once the page has loaded you can disconnect from the network entirely and it keeps working. The longer explanation