JPG and PNG Converter
Load a local image, remove a simple background with traditional color-distance matting, refine alpha with mouse or touch, then export PNG or JPEG.
UsefulTool
Portable browser tools for private, local work. Open a page, use the tool, inspect the source, or download the HTML file for offline use.
Tools
Each tool page is self-contained. The download links save the same HTML pages you can open normally.
Scientific Calculator
Calculate common functions, trigonometry, powers, constants, and definite integrals locally with a parser that avoids dynamic code execution.
Unit Converter
Convert length, area, mass, volume, temperature, speed, pressure, energy, and digital data with local formulas and quick presets.
Image and Video Metadata
Inspect metadata, strip image metadata by re-encoding, and add controlled local notes to supported image and MP4 containers.
Runtime pages declare `connect-src 'none'` and also disable common network functions in JavaScript. Images and expressions stay inside your browser process.