Watermark Images
Add a text watermark to images online for free, diagonal, centred, tiled, or footer layout with custom opacity and colour. No uploads, fully private.
About This Tool
Stamp your photos with a text watermark to protect your work or add a copyright notice before sharing online. Type your text, pick a layout, and it is drawn onto every image at the opacity you choose. Diagonal and tiled layouts sit across the whole photo, while the footer layout keeps a discreet line at the bottom. Batch watermark up to 50 photos in one pass, all in your browser.
How To Use
- Drop your images into the upload zone or click to select files from your device.
- Type the watermark text and choose a layout, size, opacity, and colour.
- Click "Add Watermark" and each image is stamped in your browser.
- Download your watermarked images individually or as a ZIP.
How It Works
The watermark text is drawn directly onto the image canvas using the Canvas API's text rendering, on top of the original pixels. The diagonal layout measures the canvas and rotates the text roughly along the diagonal so both short and long phrases fit neatly. The tiled layout repeats the text across a grid at a shallow angle, which is harder to crop out of a screenshot than a single mark. The centred and footer layouts draw a single line of text in the middle or near the bottom of the image.
Opacity is applied before drawing so the watermark blends into the photo rather than sitting as a solid, distracting block. Because the watermark becomes part of the pixel data during re-encoding, it is a permanent visual mark, not a removable overlay layer.
All of this happens on an OffscreenCanvas inside a Web Worker, so batches of photos are watermarked without freezing your browser, and nothing is ever uploaded.
Frequently Asked Questions
Can the watermark be removed afterward?
Once applied, the watermark is baked into the image's pixels during re-encoding, so it cannot be cleanly separated back out. Someone could still crop, blur, or paint over it with photo editing software, so treat it as a deterrent rather than unbreakable protection.
Will the watermark cover my photo?
At a low opacity, the text sits visibly but does not obscure the photo underneath. Increase opacity for a bolder mark, or use the footer layout to keep the main photo area completely clear.
Can I use a logo image instead of text?
Not yet. This tool stamps text only. For a logo watermark, add it in an image editor before uploading.
Can I watermark multiple photos at once?
Yes. Batch processing applies the same watermark text and settings to every image you upload at once, up to 50 files.
Are my images uploaded to a server?
No. The watermark is drawn entirely in your browser using the Canvas API. Your images never leave your device.