Add Watermark to Image – Free Online Watermark Tool

What Is an Image Watermarking Tool?

An image watermarking tool overlays identifying text or a logo on an image to indicate ownership, prevent unauthorized use, or mark a document as a draft or sample. Watermarks are used by photographers to protect their work on social media and stock photo sites, businesses to mark confidential documents, designers to share previews with clients, and content creators to brand their visual content. Digital watermarks on images are applied by drawing text or a graphic over the image with reduced opacity — making the underlying image still clearly visible while adding a visible ownership mark. The standard approach is a semi-transparent diagonal text watermark positioned across the center of the image, which makes it difficult to crop out while not completely obscuring the image content. Watermarked images are important in client-facing workflows where you want to share a preview for approval before delivering the final unwatermarked version. They are also used to share images on social media platforms where screenshots or right-click downloads are common, to visually associate the image with your brand even when the image is shared out of context. FileQuick adds a diagonal "SAMPLE" watermark text using the Canvas API's text rendering capabilities. The text is drawn at 30° angle, centered on the image, at 30% opacity in white or gray — visible but non-destructive to the underlying image. The output preserves the original image format. Processing runs entirely in your browser — no upload required.

Why use FileQuick?

Protecting visual content with a watermark before sharing publicly is standard practice for photographers, designers, and content creators. FileQuick provides a quick browser-based watermark that works on any image without requiring Photoshop or a subscription to a cloud service. The watermark is applied in your browser — your original images never leave your device, which is especially important for client work and proprietary images.

How to Add a Watermark to Images Online — Step by Step

1. Click 'Upload Files' or drag and drop your JPG, PNG, or WebP images into the drop zone.
2. Review the file list — all selected images will receive the diagonal text watermark.
3. Click 'Add Watermark'. Each image is processed using the Canvas API's text rendering.
4. Each watermarked image downloads with '_watermarked' appended to the filename.

Frequently Asked Questions