Sealixa is a fully client-side watermarking tool. No server, no upload, no third party ever sees your files. You load your images, configure your watermark, preview the result in real time, and export — everything stays on your machine.
It supports both text and image watermarks, with extensive customization options, and handles batch processing with folder-structure preservation in supported browsers.
The interface supports French and English, and automatically uses your browser language preference.
Text watermark — configure font size, color, opacity, rotation, and position to match your needs.
Image watermark — use a logo or any image as your watermark overlay.
Choose between a single placement at a specific position or a repeated tiling pattern that covers the entire image.
A real-time canvas preview updates as you adjust settings, so you always see the exact result before exporting.
Export a single image or all imported images at once. In Chrome and Edge, Sealixa recreates your original folder structure during export. Firefox is supported for single-file and flat exports.
Drag in an entire folder and Sealixa processes all images inside it, preserving the directory hierarchy for export where the browser allows.
| Feature | Chrome / Edge | Firefox |
|---|---|---|
| Single image export | Yes | Yes |
| Batch export | Yes | Yes |
| Folder import | Yes | Partial |
| Folder-structure export | Yes | No |
- Bun installed on your machine.
bun install
bun run devbun run build
This project is licensed under the Creative Commons Attribution-NonCommercial 4.0 International (CC BY-NC 4.0).
You are free to share and adapt this project for any non-commercial purpose, as long as you give appropriate credit to the original author. Selling or incorporating this software into a commercial product is not permitted without explicit written permission.
See the LICENSE file for the full terms.
Made by William Perret
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