Two code paths for the same visual watermark
The text 'Veomark' at 35% opacity and 22px font size generates both a CSS overlay snippet (a positioned .watermark element in the bottom-right corner with a subtle text-shadow for legibility) and the equivalent Canvas API code (ctx.globalAlpha, ctx.font, ctx.fillText) for baking the same watermark directly into image pixel data.
These two approaches solve genuinely different problems: the CSS version overlays a watermark visually on top of whatever's displayed in the browser (easy to update, but removable by anyone who can edit the page's CSS or take a screenshot without it), while the Canvas version actually draws the watermark into the image's pixel data itself, which persists if that image is then exported or downloaded.
The text-shadow in the CSS version (0 1px 2px rgba(0,0,0,0.6)) exists specifically to keep the watermark text legible against backgrounds of varying brightness -- a plain white watermark text with no shadow could become invisible against a light-colored image background.
Why this is starter code, not a finished pixel-stamping tool
Snippet only. It does not stamp pixels onto an upload. This generates the CSS and Canvas code as text -- it doesn't actually process an uploaded image file and produce a new, permanently watermarked image you can download. Actually stamping pixels onto a real uploaded image would need this Canvas code wired up to a file input and an actual canvas element in a working application.
The Canvas snippet shown uses placeholder x, y coordinates -- a real implementation needs those calculated based on the actual canvas dimensions and the watermark text's measured width, to correctly position it in a specific corner regardless of the source image's actual size.
pointer-events: none in the CSS version ensures the watermark overlay doesn't block clicks or interactions with whatever content sits underneath it -- an easy-to-forget detail that would otherwise make a watermarked image or button beneath it unexpectedly unclickable.
Related image-overlay and watermarking tools
For a tool that actually performs the pixel-level watermark compositing onto a real uploaded image (rather than generating starter code), the Image Watermark Compositing Tool is the working, functional version of this same task.
Frequently Asked Questions (FAQ)
What's the difference between the CSS overlay and Canvas code paths?
The CSS version overlays a watermark visually in the browser, which persists only in that rendered page (removable via page inspection or absent from a raw file download). The Canvas version draws the watermark directly into an image's pixel data, so it persists if that image is exported or downloaded as a file.
Why does the CSS watermark include a text-shadow?
The text-shadow (0 1px 2px rgba(0,0,0,0.6)) helps keep the watermark legible against backgrounds of varying brightness -- without it, plain light-colored watermark text could become hard to see or invisible against a similarly light-colored background image.
Does this tool actually watermark an uploaded image file?
No. Snippet only. It does not stamp pixels onto an upload. It generates starter CSS and Canvas API code as text. Actually stamping pixels onto a real uploaded image requires wiring this Canvas code up to a working file input and canvas element in an actual application.
What does pointer-events: none accomplish in the CSS snippet?
It ensures the watermark overlay doesn't intercept clicks or interactions meant for whatever content sits beneath it -- without this, a watermark positioned over a clickable image or button could unexpectedly block interaction with that underlying element.
Are the x, y coordinates in the Canvas snippet ready to use as-is?
No, they're placeholders. A real implementation needs those coordinates calculated based on the actual canvas dimensions and the watermark text's measured width, so the watermark positions correctly regardless of the specific source image's size.
