Batch watermark
Apply the same text watermark to many files.
This runs in your browser. Nothing is uploaded.
About Batch watermark
Stamps the same line of white text into the bottom-left corner of many images at once and zips the results, compositing each one in your browser rather than on a server.
Photographers posting a portfolio, agencies sending proofs, anyone putting a set of product shots somewhere public: the reason to watermark is to keep your name attached to the image as it gets reposted, and the reason to do it in bulk is that nobody marks up sixty files by hand. The images in question are usually unpublished client work, which is a poor fit for an upload form.
Type your text and each selected image is drawn onto a canvas with that line composited over it — white, 70 percent opacity, bold 28-pixel type, 16 pixels in from the bottom-left corner. Leave the field empty and it falls back to this site's domain, which is a placeholder rather than a suggestion. Everything is zipped as batch-watermark.zip.
The size and position are fixed, and that is the real constraint. On a 6000-pixel photograph, 28-pixel text is a barely visible speck; on a 400-pixel thumbnail it covers the corner. White text also disappears against a pale background, so a set of product shots on white will come back looking unmarked. Check one file before committing to the whole folder.
How to use Batch watermark
- 1Drop or select every image you want marked.
- 2Type the watermark text you want composited in.
- 3Click Process & download zip.
- 4Open one result and confirm the mark is visible against that background.
What it won't do
- Text only — no logo, image or graphic watermarks.
- Fixed white colour, 28-pixel size and bottom-left position.
- Output is PNG, so watermarked JPEGs come back considerably larger.
Common questions
Does a watermark stop people stealing my photos?
No, and it is worth being clear about that. A corner watermark is attribution and mild deterrence: it survives casual reposting and it tells people where the image came from. It does not survive a crop, and content-aware fill in any current editor removes it in seconds. Treat it as a credit line, not protection.
Can I use my logo instead of text?
Not in the batch tool — it composites a single line of text only. For a logo or graphic overlay you need image-on-image compositing, which means placing it per file rather than applying one fixed position across a mixed set. The text route is what scales cleanly to sixty images.
Why is my watermark tiny on some images and huge on others?
Because the type size is a fixed 28 pixels rather than a percentage of the image. That looks right on something around 1000 to 2000 pixels wide and wrong at either extreme. Resize your set to consistent dimensions first and the watermark will land consistently too.
Can I change the colour or position of the watermark?
No. It is white at 70 percent opacity in the bottom-left corner, full stop. That combination is legible over most photographic content, which is the reason for the choice, but it does mean images with bright lower-left corners are a bad match for this tool.
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