Image Watermark Tool — Text Overlay

A photograph posted without a mark on it travels well and credits nobody. Image Watermark Tool paints your own text across the picture before it leaves your machine: a studio name in a corner, a DRAFT stamp over a proof, or a repeating tile that survives a crop. Everything renders on a Canvas element in the page, so the photo is never uploaded anywhere.

Nine anchor positions cover the corners, edges and centre. Tile mode fills the whole frame instead, offsetting alternate rows so the result reads as texture rather than a rigid grid. Size, opacity, rotation, colour, font and an optional contrasting outline are all live, and the canvas redraws on every change.

Getting a Watermark Onto Your Photo

1. Drop a JPEG, PNG or WebP onto the upload panel, or click it to browse. The preview appears once the file decodes.
2. Type into Watermark Text. It opens pre-filled with Utility Tools Lab, and Load Sample cycles through other studio-style names if you want to see how a longer or shorter string sits on the frame.
3. Pick a spot on the 3×3 Placement grid, or press Tile across image to repeat the text edge to edge.
4. Tune Size, Opacity, Rotation and Margin. Hold Hold to compare at any point to see the untouched original underneath.
5. Press Download. PNG sources come back as PNG; JPEG and WebP come back as JPEG at quality 0.95.

How It Calculates the Watermark Scale

Size and margin are percentages of image width, not fixed pixel counts, and that choice is what makes one setting reusable across a whole shoot. The default 6% puts a 240px watermark on a 4000px-wide photo and a 48px watermark on an 800px thumbnail, which look identical once both are scaled to fit a screen. A fixed pixel size would be unreadable on the first and would swallow the second.

The same reasoning governs the preview. What you see on screen is capped at 900px on its longest edge so dragging a slider stays responsive, but Download throws that away and re-renders from the original image at its natural dimensions. The exported watermark is drawn at full resolution rather than upscaled from the preview, which is the part most browser watermarking tools get wrong.

Supported Formats and the 10 MB Ceiling

• Input: JPEG, PNG and WebP. Anything else is refused with “This tool reads JPEG, PNG and WebP only.” before a canvas is ever created.
• File size: capped at 10 MB. A larger file stops at “That image is larger than the 10 MB ceiling.” The limit exists because the whole bitmap is held in memory twice during export, once as the decoded source and once as the output canvas.
• Transparency: a PNG with an alpha channel keeps it, since PNG sources export as PNG. A transparent PNG sent through a JPEG path would flatten onto black, so that conversion is never done silently.
• Empty text: clearing the box shows “Type some watermark text — the image exports unchanged while this box is empty.” and the download gives you back your original pixels, which is occasionally what you want.

Not a Substitute for Copyright Registration

A visible watermark deters casual reuse and tells an honest viewer who made the picture. It does not establish ownership, and it is not difficult to remove: a corner mark can be cropped off in one gesture, and modern inpainting will erase a semi-transparent overlay from a flat background with little trace. Tile mode at 60% opacity is meaningfully harder to strip than a single 6% corner mark, which is the trade the tool actually offers.

If what you need is provable authorship, that lives in copyright registration and in the capture metadata your camera already writes. Treat this as attribution and friction, not protection.