Quickly convert a JPG picture to grayscale.
Execution runs 100% locally inside the browser sandbox using HTML5 Canvas, Web Cryptography Subtle API, and Web Workers. Zero egress.
Zero network latency. Operates completely offline with zero dependencies on third-party backend servers or cloud services.
Built according to official RFC specifications, cryptographic test vectors, and enterprise-grade data transformation standards.
Select your color photo.
Calibrate brightness and contrast sliders if desired.
Save your black and white image.
It applies standard ITU-R BT.601 luminance weighting: Y = 0.299R + 0.587G + 0.114B.
Zero-egress companion tools in the Image Processing suite
Convert and compress WebP, PNG, and JPEG images locally with zero server uploads.
Clean, minify, and sanitize SVG files and markup locally.
Generate multi-size web, Apple Touch, and Android PWA favicons instantly.
