CalConverters

Add Watermark to Image

Drop a photo, add a text or image watermark, position it on a 9-point grid, adjust opacity and size, then download the result. Everything runs locally in your browser — nothing is ever uploaded.

Files never leave your device

Drop an image to watermark, or click to browse

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What This Tool Does

Drop in a photo, choose between a text watermark or an image/logo overlay, position it on a 9-point grid, and adjust its opacity and size before downloading the finished file. The live preview updates as you type or drag a slider, and the download is rendered by the same engine used across every tool in this family.

Text or Image Watermark — Your Choice

ModeWhat you configureGood for
TextThe text itself, font size, color, opacity, positionCopyright notices, a signature, a website name across a portfolio
Image / LogoAn overlay image file, scale, opacity, positionA brand logo, a stamp, or any graphic mark

Both modes share the same position grid and opacity control, so switching between text and image doesn't mean relearning the controls — only the size setting differs, since text is sized by font size while an image is sized by a scale percentage relative to its own original dimensions.

Choosing a Position

The 9-position grid mirrors how a caption or stamp is placed in most photo editors: three positions along the top (left, center, right), three along the bottom, and three in the middle row (left, center, right), with dead center included for a watermark meant to sit over the whole image. Bottom-right is selected by default, matching where photographers and designers most commonly place a signature or logo mark, but any of the nine positions works for any content.

Opacity applies the same way in both modes — drag it down for a subtle, semi-transparent mark that doesn't fight for attention with the photo underneath, or leave it near full strength for a bold, clearly visible watermark meant to deter unauthorized reuse.

The Watermark Is Baked Into the Pixels

Tip: Unlike a watermark layer in a full photo editor, what this tool produces isn't removable. The text or logo you configure gets composited directly into the photo's pixel data at download time — there's no hidden layer, no metadata flag, and no "undo watermark" option once the file is saved, because after that point the watermark simply is part of the image.

This permanence is exactly what makes a watermark useful for protecting a photo shared publicly: a portfolio preview, a listing photo, or a social media post can carry a visible mark that stays with the image through screenshots, re-saves, and re-uploads, since it's no longer a separate element that software can strip out automatically. If you need an unmarked copy for your own records, keep the original file — the watermarking tool works from the source you drop in and never modifies it, only the file you download.

Your Files Never Leave Your Device

The moment you drop a photo or a logo image, its bytes stay local to your browser tab. The live preview is rendered by your browser directly, and the final download is produced by a small WebAssembly module that never sends anything over the network. Closing the tab discards everything — there's nothing left behind on a server, because no server was ever involved.

If you also want to crop this photo, rotate or straighten it, or convert it to a different format, see the Crop Image, Rotate & Flip, and Image Format Converter tools — all built the same on-device way.

Frequently asked questions

Is this watermark tool really free?
Yes. There's no sign-up, no extra watermark added by the tool itself beyond the one you design, and no limit on how many photos you can watermark. The tool runs entirely in your browser, so there's no server cost to recoup from you.
Is my photo or logo uploaded anywhere?
No. The live preview is drawn locally by your browser, and the final watermarking happens through WebAssembly running inside the same tab. Neither your base photo nor your logo file ever travels over the network.
Can the watermark be removed later, by me or anyone else?
No — and that's the point. The watermark is baked directly into the photo's pixels when you download it, the same way a printed stamp becomes part of the paper. It isn't a separate layer sitting on top that can be toggled off or peeled away in an editor; producing the watermarked file merges it permanently into the image.
Can I use a transparent PNG logo as my watermark?
Yes. If your logo file has transparent areas, that transparency is respected when it's composited onto your photo — only the logo's actual artwork shows up, not a solid rectangle around it.
Does the text watermark support Vietnamese or other non-English characters?
Yes. The text watermark uses a font with full Vietnamese coverage, including every tone-marked character, so your text renders correctly rather than showing missing-glyph boxes.
Where can I place the watermark on my photo?
A 9-position grid: the three top corners plus top-center, the three bottom corners plus bottom-center, the two center-left/center-right edges, and dead center. Bottom-right is the default, since that's the most common spot for a signature or logo mark.
What file format do I get back?
Whatever format your base photo was. A JPEG stays a JPEG, a PNG stays a PNG, and the same holds for WebP, GIF, and BMP — this tool only adds the watermark, it never changes the container format.