img.koner.app

img.koner.app is a fast browser based tool for resizing, compressing, and watermarking images. It uses classic, deterministic image processing. No AI model involved, so results are quick and predictable. Everything runs locally on your own device: nothing is uploaded to a server. Because it runs in the browser, it works the same way on Windows, macOS, Linux, Android and iOS, on any device with a supported browser.

Resize mode: Choose from fit within, exact size, cover (crop), or scale by percentage, then set your desired output format and quality.

Watermark mode: Stamp a logo or text onto every image with precise control over size, position, and opacity.

Key Features

• Resize: Scale images to exact dimensions or by percentage, with options to preserve aspect ratio.
• Compress: Reduce file size while controlling output quality, for faster page loads and easier sharing.
• Watermark: Add a text or image watermark, positioned and styled the way you want.
• 100% On-Device Processing: Your images never leave your computer or phone - nothing is uploaded to a server.
• No Installation Needed: Runs entirely in the browser tab, nothing to download or set up.
• Cross-Platform: Works on Windows, macOS, Linux, Android and iOS - any device with Chrome, Edge, Safari, or Firefox.