Semaphore ASCII

Semaphore is a free, open-source image to ASCII converter that runs entirely on the visitor’s device. Drop a PNG, JPG, WebP or GIF and the browser samples it on a local canvas, maps each cell to a character by luminance, and renders the result live. Nothing is uploaded: there is no backend, no account, no cookies and no third-party runtime request, and the production Content-Security-Policy sets connect-src 'none' so the page cannot open a fetch, XHR or WebSocket even if its code tried. Six character sets are included — standard, a 68-step detailed ramp, blocks, minimal, binary, and a braille mode that packs a dithered 2x4 dot matrix into each cell for roughly eight times the density of a classic ramp. Output can be copied as plain text, downloaded as .txt or .png, or rendered as a share card that prints the conversion parameters. Built with Vite and TypeScript, MIT licensed, self-hostable.