Software with Image Conversion

void◆sprite is an actively developed cross-platform, open-source pixelart editor. 
Has features useful for game development, such as split sessions (multiple files on one canvas) and previews of spritesheet animations, tilesets or 3D cubes. 
Other unique features include: layer variants, on-canvas comments, custom patterns, templates and real-time LAN collaboration.
Supports many image formats, including some specific to other editors like Aseprite and GraphicsGale.
Most common color palette formats are supported too, and can be used in a separate indexed editor mode.

export.textmode.art converts images, animated GIFs, video, and direct media links into textmode art in the browser. It provides glyph, font, palette, color, framing, and post-processing controls, plus frame-accurate playback and export ranges for animated sources. Everything is processed locally in your browser, and outputs include raster, vector, text, JSON, frame-sequence ZIP, GIF, MP4, and WebM downloads.

AltusPixel is a pixel art editor for game developers, sold on Steam for Windows and Linux. It is a single offline desktop application with no account.

Engine Export: complete GameMaker project exports (sprite, tileset and autotiles/room), a Godot TileSet and map scene, a Tiled map, Unity sprite metadata, and .ase filess.

Drawing: layers that can be added, reordered, hidden and recolored one at a time; lines that snap to isometric slopes and isometric scenes built block by block; fills with a material such as brick, stone, sand, grass, leaves, wood or water instead of a flat color; text in bundled pixel fonts with a live preview; a Bend tool that curves a straight strip.

Animation: frame-by-frame animation with onion skin and in-app playback; a character can be rigged on the canvas by placing joints, and several rigged characters can stand on one stage and run together; export to GIF, animated WebP, APNG and sprite sheets.

Tiles: tilemap layers where editing one tile updates every placed copy, and autotile set generation.

Color: thirty-six bundled palettes, a palette library, and template palettes pasted straight in.

Pipeline: recorded macros that run across a whole folder; an atlas packer with JSON metadata and native Godot .tres output; automatic re-export on save into a game's asset folder; in-file snapshots and a session timelapse recorder; PNG, integer-scaled PNG and sprite-sheet export.

Also developed: photos can be turned into a printable cross-stitch pattern at real size. The application contains no generative AI features.