Xonvert
Image

Add Watermark

Stamp a text watermark — single corner or tiled across the whole image.
Loading…

About Add Watermark

Add Watermark — free, private, browser-based image tool

Stamp a text watermark — single corner or tiled across the whole image. It takes image and gives you PNG, JPEG, WEBP. It runs in your browser, so the file is processed on your own device.

Why use Add Watermark

  • ·Files stay on your device — nothing is uploaded
  • ·No signup needed
  • ·Works in any modern browser, on any OS
  • ·Free daily use; Pro removes limits and watermarks

How to use it

  1. 1Drop an image file on the page, or click to choose one.
  2. 2Pick the options you want.
  3. 3Download the PNG, JPEG, WEBP file.

What Add Watermark does

Stamp a text watermark — single corner or tiled across the whole image. The result is a PNG, JPEG, WEBP file you download directly.

How it works

Uses Canvas2D and WebGL2 with OffscreenCanvas for parallel processing. Filters run as GPU shaders where supported, falling back to CPU SIMD via WebAssembly. The processing code runs inside the page, so your file is not uploaded to a server — you can confirm this in your browser's DevTools → Network tab.

Frequently asked questions

Does Add Watermark upload my files?+
No. Add Watermark runs in your browser and processes the file on your device. Nothing is sent to our servers.
Is Add Watermark free?+
Yes, with a daily free allowance and no signup. Xonvert Pro ($4.99/month) removes the daily limits and the watermark on exported files.
Do I need to install anything?+
No. It works in any modern browser on Windows, macOS, Linux, ChromeOS, Android and iPad.

Related image tools

Blur Studio
Gaussian blur with a live before/after slider. Sharp, fast, private.
Face Detection
Find faces in a photo on your device — boxes, count and key points. Nothing is uploaded.
Remove Background
Drop a photo. The subject is isolated instantly — no signup, no uploads.
Compress Image
Shrink any JPG, PNG, WebP, or AVIF. See savings live as you tune quality.
Convert Image Format
JPG · PNG · WebP · AVIF — convert any image to any modern format.
Resize Image
Scale by pixels or percent — sharp Lanczos resampling, no blur.