Add Watermark to Image Online Free — Text and Logo Watermarks

Why Watermark Your Images

A watermark serves two purposes: it credits the creator and deters unauthorized reuse. Photographers add copyright notices to portfolio images shared online. E-commerce sellers stamp product photos before posting to marketplaces to prevent image theft. Educators add institutional logos to slides and printouts. In each case, the goal is the same — make the source visible without making the image unusable.

Most desktop watermarking tools require installation, a subscription, or both. Browser-based tools often upload your image to a server to process it. The Watermark Adder on PublicSoftTools processes everything using the browser's Canvas API — your image never leaves your device.

How to Add a Watermark to an Image Online

1. Open the Watermark Adder.
2. Drop your image onto the upload zone or click to browse. JPEG, PNG, WebP, GIF, and most other image formats are accepted.
3. Choose Text Watermark or Image / Logo mode using the tabs below the preview.
4. For text: type your watermark text (e.g. © Your Name 2025), choose a font and color, then adjust the font size, opacity, and rotation angle using the sliders.
5. For a logo: click Upload logo to select a PNG file (ideally with a transparent background), then set the logo size as a percentage of the image width and the opacity.
6. Click one of the nine position buttons to place the watermark — top-left, center, bottom-right, and so on.
7. Choose an output format (JPEG, PNG, or WebP), click Apply Watermark, and download the result.

Who Uses Image Watermarks — and How

Text Watermarks vs Logo Watermarks

Both modes produce a permanent overlay baked into the exported image at full resolution. The right choice depends on what you need to communicate.

When to use text mode

Text watermarks are fastest to set up — type your notice and adjust a few sliders. They work well for copyright notices (© Your Name 2025), domain names, social handles, or status labels like DRAFT or SAMPLE. Rotating the text diagonally (−30° to −45°) makes it span more of the image surface, which is much harder to crop out than a corner stamp.

When to use logo mode

A logo watermark places your brand mark — a PNG with a transparent background — over the image. This is ideal when your brand identity includes a graphic element that text alone cannot represent: a wordmark, icon, or combined symbol. Export your logo from a design tool as PNG-24 with transparency, then upload it here. If your PNG has a solid white or black background, it will create a visible rectangle over the photo.

Placement and Opacity Tips

Choose position based on the image composition

Bottom-right is the conventional corner for photo watermarks, but it is also the easiest to crop out. For images where the subject is centered, a center position at moderate size and opacity protects the content without being intrusive. For social media thumbnails, a top-right or top-left corner keeps the watermark visible even when the image is displayed at small sizes.

Opacity for protection vs branding

A watermark at 50–70% opacity is readable and difficult to remove with simple cloning tools. A subtle branding stamp on product or editorial images typically uses 20–40% — present enough to identify the source without distracting from the subject. Full 100% opacity creates a solid overlay that obscures the image and is rarely appropriate outside of DRAFT or CONFIDENTIAL labels.

Font size scales with resolution

Font size is expressed as a percentage of the shorter side of the image. A 5% setting renders 40 px on an 800-pixel image and 150 px on a 3000-pixel image. This keeps the watermark proportionally consistent when applying the same settings across images of different resolutions — useful for bulk workflows where you process images one at a time.

After Watermarking: Related Image Tasks

Watermarking is often one step in a larger image preparation workflow. Once your image is watermarked, you may also need to:

• Resize the image to specific pixel dimensions for a platform or upload limit.
• Convert the format — for example, from PNG to WebP for faster web loading.
• Crop the image to a required aspect ratio (1:1 for Instagram, 16:9 for YouTube thumbnails) before or after watermarking.

Common Questions

Is my image uploaded anywhere?

No. All processing uses the Canvas API in your browser. The image never leaves your device, is not stored on any server, and is not accessible to anyone else. The tool functions without an internet connection once the page has loaded.

Does watermarking reduce image quality?

The watermark is drawn at native resolution on a canvas matching the original image dimensions, so no quality is lost in the watermark step itself. If you export as JPEG or WebP, the encoder applies compression (the tool uses 92% quality, which is visually lossless for most images). Exporting as PNG preserves pixel-perfect quality at a larger file size.

Can I remove a watermark added with this tool?

A watermark baked into the canvas at moderate-to-high opacity and with rotation is permanent — it is part of the pixel data. There is no hidden layer or metadata that can be stripped. This is the same behavior as any pixel-based watermark tool.

What if my logo PNG has a white background?

A PNG with a solid background will create a visible rectangle on the photo. Export your logo with transparency from your design tool (Figma, Illustrator, Photoshop) as PNG-24. The “transparent background” option is typically in the export dialog.

Can I add a watermark to a GIF?

Yes, the tool accepts GIF files as input. The watermark is applied to the first frame and exported as a static image (JPEG, PNG, or WebP). If you need to watermark a full animated GIF, that requires frame-by-frame processing which is outside the scope of this tool.