{"$schema":"https://toolsly.tools/schemas/tool-manifest-v1.json","generated":"2026-06-02T20:06:15.971Z","discovery":{"catalog":"https://freepngtojpg.com/tools.json","llmsTxt":"https://freepngtojpg.com/llms.txt","sitemap":"https://freepngtojpg.com/sitemap.xml"},"relatedTools":[{"slug":"image-to-bw","name":"Image to Black & White","url":"https://freepngtojpg.com/image-to-bw"},{"slug":"image-to-sepia","name":"Image to Sepia","url":"https://freepngtojpg.com/image-to-sepia"},{"slug":"image-invert-colors","name":"Invert Image Colors","url":"https://freepngtojpg.com/image-invert-colors"},{"slug":"image-blur","name":"Blur Image","url":"https://freepngtojpg.com/image-blur"},{"slug":"image-rotate","name":"Rotate Image","url":"https://freepngtojpg.com/image-rotate"},{"slug":"image-flip-horizontal","name":"Flip Image Horizontally","url":"https://freepngtojpg.com/image-flip-horizontal"},{"slug":"image-flip-vertical","name":"Flip Image Vertically","url":"https://freepngtojpg.com/image-flip-vertical"},{"slug":"image-brightness","name":"Image Brightness Adjuster","url":"https://freepngtojpg.com/image-brightness"}],"kind":"converter","slug":"image-to-grayscale","name":"Image to Grayscale","description":"Convert any image to grayscale — pick the algorithm, runs entirely in your browser.","longDescription":"Drop in an image (PNG, JPG, WebP, GIF, BMP, AVIF) and download a grayscale version. Pick from four standard algorithms: Luminance (the perceptual default — closest to how the human eye weighs RGB channels), Average (a flat mean of R, G, B), Lightness (the midpoint of max and min channel — softer contrast), and Desaturation (HSL-style saturation removal). Output format matches the input where possible, defaulting to PNG. Everything runs locally in your browser.","category":"image","categoryName":"Image","keywords":["grayscale image online","convert image to grayscale","image to grayscale","grayscale converter","grayscale photo","make image grayscale","image to gray online","black and white photo converter","grayscale filter","convert color to grayscale","free grayscale image tool","online grayscale converter"],"url":"https://freepngtojpg.com/image-to-grayscale","runsOn":"client","multiple":false,"batch":false,"input":{"type":"file","extensions":[".png",".jpg",".jpeg",".webp",".gif",".bmp",".avif"],"mimeTypes":["image/png","image/jpeg","image/webp","image/gif","image/bmp","image/avif"]},"output":{"type":"file","extension":".png","mimeType":"image/png"},"options":[{"type":"select","key":"algorithm","label":"Algorithm","defaultValue":"luminance","choices":[{"value":"luminance","label":"Luminance (recommended)"},{"value":"average","label":"Average"},{"value":"lightness","label":"Lightness"},{"value":"desaturation","label":"Desaturation"}],"help":"Luminance weights R/G/B perceptually (0.2126/0.7152/0.0722). Average is a plain mean. Lightness uses (max+min)/2. Desaturation removes HSL saturation."}],"invocation":{"webUi":"https://freepngtojpg.com/image-to-grayscale","api":null,"notes":"Currently runs client-side in the user's browser. Drop a file on the UI at `webUi` and download the converted result. A remote MCP/REST API is planned."}}