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Add text or image watermarks to protect your images. Free online tool for branding photos directly in your browser. Supports image, watermark.
Image Watermarker is a free online image tool that runs entirely in your browser — your files never leave your device and are never uploaded to any server. No installation, no signup; works on both phone and desktop, ready to use instantly.
Image processing is done locally via Canvas API and WebAssembly with batch support. Preview results instantly before downloading.
We noticed most image compressors upload files to servers. Since privacy is our core principle, we built this tool to process everything locally using Canvas API and WebAssembly.
Yes, completely free with no signup required.
Yes, it works on mobile browsers with touch support.
Image
The tools provide quality controls so you can balance file size and image quality.
ToolPure supports JPG, PNG, WebP, AVIF, GIF, and BMP formats. You can convert between any of these formats and adjust quality from 10% to 100% for optimal file size.
Yes, you can upload and process up to 100 images simultaneously. Batch operations include compression, format conversion, and resizing with a single quality setting applied to all files.
Both options are available. For JPG and WebP, you can choose lossy compression with adjustable quality. For PNG, lossless compression is used. AVIF supports both modes depending on your quality settings.
Yes. Image Watermarker runs entirely in your browser: files you select are never uploaded to any server — all processing happens in your device's memory and is wiped when you close the page.
🔒 Privacy & Security：All processing happens locally in your browser. Files are never uploaded or stored.
🔒 Privacy: All processing happens locally in your browser. Your files and data never leave your device — no upload, no server, no tracking.