Free Image Watermark Tool – Add Text & Logo Watermarks to Photos

What Is an Image Watermark and How Does It Work

A watermark is a piece of text or a logo laid over a photo to mark ownership and discourage unauthorized reuse. Share an image online and it is one screenshot away from being lifted without credit; a visible mark makes that harder and quietly advertises your brand at the same time. Photographers protecting proofs, online sellers branding product shots, designers claiming portfolio work, and businesses stamping documents all reach for one. This tool builds text or logo watermarks entirely in your browser, with no upload, so even sensitive client images stay on your device. Under the hood, your photo is drawn onto an HTML canvas and the watermark is composited on top of it — either as rendered text (with your chosen font, size, color, stroke, and shadow) or as a second image layer if you upload a logo. You control opacity from 5% to 100%, rotation from -180° to 180°, and blend modes like Multiply, Screen, and Overlay that change how the mark interacts with the pixels beneath it. A tile mode repeats the watermark across the whole frame. Opacity works by multiplying the watermark layer alpha before compositing, which is why a 35% mark lets the photo read through it rather than sitting as a solid block. If your logo is a transparent PNG, that alpha channel is respected, so only the shape of the mark lands on the photo and not a rectangular box around it — a JPG logo cannot do this because JPEG has no alpha channel. When you export, the composite canvas is re-encoded to PNG, JPG, or WebP at Original, HD, 2× Retina, or 4K resolution. Choosing JPG applies fresh lossy compression to the whole frame, so fine watermark text can pick up faint halos at low quality settings; PNG keeps the composite pixel-exact at the cost of a larger file. The redraw also strips EXIF metadata from the original, and batch mode applies identical settings to every uploaded image. Here is a concrete setup. Take a 2000×1333 product photo. Add your studio name as text, set opacity to 35%, rotate it -30°, and switch on tile mode: the name repeats diagonally across the entire image at a size that is readable but not distracting. Export as JPG at HD and you get a roughly 400–600 KB branded photo that is genuinely hard to crop clean. For a subtler look, place a single logo in the bottom-right corner at 25% opacity instead — the mark claims ownership while keeping the eye on the product, and the exported file barely differs in size from the original. The practical uses split by intent. Photographers tile a low-opacity mark across preview galleries so clients can review but not use images before paying. E-commerce sellers add a small corner logo to product shots so competitors cannot lift them for their own listings. Agencies stamp "Confidential" or "Draft" across shared mockups. And creators drop a handle onto social images so reshares still point back to them. The batch feature makes all of these viable at scale — brand a hundred photos with one configuration and download them as a ZIP. The key trade-off is visibility versus distraction. A subtle corner mark looks clean but can be cropped or cloned out by a determined editor; a tiled, moderate-opacity pattern is far harder to remove because it overlaps the subject everywhere, so use it for anything you truly want protected. Match the watermark color and font to your brand for consistency, and avoid opacity so high it ruins the photo or so low it vanishes. Note that a watermark deters casual theft but is not absolute protection. And as always, your images never leave your browser — nothing is uploaded, nothing is stored, and everything clears when you close the tab.

Learn More — Image Watermark Tool Guide

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