Image Watermark Tool
Add text watermarks over images.
Overview
The Image Watermark Tool adds a text watermark over an uploaded photograph, with controls for the caption text, font size, colour, opacity and position. Drop in a picture, type your watermark, and the tool returns a re-encoded copy with the caption rendered into the image's pixels.
It is the practical move when publishing portfolio shots, sharing a draft layout with a "preview only" label, attributing photography on a shared moodboard, or protecting product imagery before an embargo lifts. Photographers and bloggers use it as a quick way to add a text watermark to an image online without launching a desktop editor.
How it works
The renderer composites the watermark onto a copy of the source image using a standard "source-over" blending mode — the watermark colour is mixed with the underlying pixel based on the opacity slider. Anti-aliased glyphs use sub-pixel coverage so even small text reads as smooth strokes rather than blocky pixels.
Position is controlled by an anchor (corner or centre) plus a padding distance, which means the watermark stays in the same relative place across images of different sizes — useful when watermarking a folder of mixed-aspect-ratio photos in turn. The rendered output is encoded in the source format with quality settings carried over from the input.
Examples
Before: portrait.jpg
After: portrait-wm.jpg with "© Studio Name 2026" rendered in white
text at 60% opacity in the bottom-right corner.
Before: product.jpg
After: product-wm.jpg with "DRAFT — DO NOT SHARE" at 30% opacity
across the centre as a discouragement to leaks.
Before: blog-hero.jpg
After: blog-hero-wm.jpg with "@username" in the bottom-left for
attribution.
FAQ
What opacity should I use?
50-70% reads as legible without dominating the image. Drop to 20-30% for subtle attribution; raise to 80%+ for explicit "DO NOT USE" warnings.
Can I rotate the watermark?
The simple version of the tool renders text straight. For diagonal repeating watermarks across a whole image, see the Image Watermarker tool which adds more positioning and overlay options.
Will the watermark survive re-encoding?
Yes — the watermark is rasterised into the pixels, so it persists through any further format conversions. Removing it requires careful inpainting.
Can I add a logo instead of text?
Use the Image Watermarker tool for logo overlays. This tool focuses on text captions with font controls.
Does it work on transparent PNGs?
Yes — the watermark is composited against the existing pixels and alpha is preserved. Transparent areas stay transparent unless the watermark itself covers them.