Ditherlab

An image and ASCII dithering studio for macOS. Turn any photo, video, or webcam feed into 1-bit, halftoned, and ASCII art — nine error-diffusion kernels, ordered and blue-noise dithers, procedural halftones, four ASCII renderers, sixty-plus retro palettes, and GIF, MP4, and PNG export. Free, offline, on-device.

Download Ditherlab 1.1.0 for macOS — free (1.8 MB · macOS 13.5+, Apple Silicon & Intel)

First launch: macOS will warn that the app is from an unidentified developer. Open System Settings → Privacy & Security, scroll down, and click Open Anyway — needed once only. Ditherlab runs fully offline; the source is on GitHub.