©️ Add Watermark to Image
Stamp your name, ©, or "CONFIDENTIAL" across an image, control size, opacity and position, all locally.
How the add watermark to image works
A watermark overlays text on an image so copies can be traced or marked. Type your text, set the font size as a percentage of the image width so it scales to any photo, pick a colour and opacity, and choose a position, a single corner or centre, or a tiled diagonal repeat that covers the whole image and is harder to crop out. Sizing by percentage rather than fixed pixels is what keeps the mark looking the same on a small thumbnail and a full-resolution photo; the opacity is applied as the canvas global alpha, so 50% lets half the underlying image show through the text. The tool draws the text onto a canvas over the image with a live preview, then lets you download the result.
A tiled, semi-transparent watermark across the middle is far harder to remove than a single small corner mark. For proofs and drafts, "DRAFT" or "CONFIDENTIAL" at low opacity reads clearly without hiding the content. Because everything runs on your device, you can watermark scans of IDs or contracts before sharing them without uploading the originals anywhere.
Frequently asked questions
How do I add a text watermark to a photo?
Load the image, type your watermark text, adjust the size, colour and opacity, pick a position or turn on tiling, and download. A live preview shows the result before you save it.
How do I make a watermark hard to remove?
Use the tiled diagonal mode at moderate opacity so the text repeats across the whole image. A single small corner mark is trivial to crop or clone out; a full-coverage tile is not.
Can I control the transparency?
Yes, the opacity slider sets how see-through the text is. Around 40-60% is a good balance: visible enough to deter reuse, faint enough not to obscure the content.
Does it keep transparency in PNGs?
Yes, export as PNG to preserve an alpha channel, or choose JPEG/WebP for a smaller file. The watermark is drawn on top of the original pixels at full resolution.
What colour and opacity work best?
It depends on the image: white or light grey at 40-60% opacity reads on most photos, while a dark colour shows better over bright or pale areas. On a busy image, the diagonal tile helps because at least some repetitions fall on contrasting backgrounds. Preview and adjust until the text is legible but not overpowering.
Does a watermark actually stop image theft?
It doesn't make copying impossible, but a visible mark deters casual reuse and identifies the source if an image is lifted. A centred, tiled, semi-transparent watermark is far harder to remove cleanly than a small corner logo, which raises the effort enough to discourage most misuse.
Is my image uploaded to watermark it?
No, the text is drawn with the Canvas API in your browser. Sensitive documents and photos stay on your device and the tool works offline.