Image watermark
Text or logo watermarks, 9-grid or tiled, batch-packed as ZIP; local canvas compositing, nothing uploaded.
Photos posted publicly get reposted without credit; sample deliverables get used without payment. A watermark is the cheapest provenance signal, and the need is simple: overlay translucent text or a logo, place it sensibly, batch it. Too many online tools demand accounts, cap counts, stamp their own badge — or store your images on their servers.
This tool composites locally on canvas: text watermarks with size, color, opacity and rotation; logo watermarks by width ratio; positioning on a 9-grid (corners/edges/center) or tiled across the whole image. Drop multiple files to batch, tune on the live preview, then export everything as one ZIP. Output PNG (lossless) or JPEG with adjustable quality — for photos, JPEG at 90%+ is the norm.
Choosing parameters that work without ruining the picture
Opacity 0.3–0.5, font size at 4–8% of the short side, a corner position with margin — that is the balance between visibility and aesthetics. A watermark is a provenance statement, not an anti-crop shield: too faint nobody sees it, too heavy it ruins the image, and no watermark survives a determined crop. For high-value content, center-tiling with moderate opacity raises removal cost the most. Prefer transparent PNGs for logos.
Tiling vs 9-grid
The 9-grid suits portfolio shots and photography where the image itself is the product — one corner mark claims ownership without stealing the scene. Tiling suits ID scans, contracts and screenshots that must survive whole-image reposts: repeated marks defeat partial cropping, at the cost of readability. Pick by purpose, not both.
Frequently asked questions
- Are images uploaded?
- No. All compositing happens in browser canvas and the ZIP is written locally — photos never leave the device, so client samples and internal material are safe to process.
- What is inside the batch ZIP?
- The composited images under current parameters, keeping original filenames (extension follows output format). The ZIP is store-mode (no extra compression) since images are already compressed formats.
- Does it change image size or quality?
- Compositing never resizes or crops — output dimensions match the source exactly. JPEG output is lossy re-encoding (quality adjustable, default 90%); choose PNG for absolute losslessness. EXIF and other metadata are not preserved, which is usually exactly the privacy outcome you want.