Full-featured editor with bone hierarchy, slots, timeline, and live preview
SpineBones is a 2D skeletal animation editor for building rigs, animating on a timeline, and exporting as WebM video, PNG sequences, or sprite sheets.
A complete workflow from rig building to final export — no plugins, no subscriptions.
Build parent-child bone chains, re-parent bones, and organize into groups. Full IK support for supported chains.
Add slots to bones, upload PNG/JPG/SVG/WebP images, and switch attachments per frame for sprite-style animation.
Insert, move, copy, and loop keyframes. Multi-select, drag, easing controls, and audio import for timing reference.
16:9 export viewport with camera pan and zoom. Play back at up to 120 FPS with onion skin ghost overlays.
Convert attachments into editable mesh attachments. Deform mesh vertices directly on canvas and animate per frame.
Export as WebM video, PNG sequence ZIP, or sprite sheet ZIP. Save projects as portable .sbn packages.
From anime characters to dark fantasy heroes — SpineBones handles it all.
Two dedicated modes keep rig editing and animation cleanly separated.
Create bone hierarchies, attach images via slots, align attachments. Define your base pose without touching the timeline.
Keyframe position, rotation, and scale per bone. Fade attachments, deform meshes, and use IK for complex chains.
Play back at any FPS. Use onion skin overlays to check arcs and spacing. Import audio for timing reference.
Export WebM video, PNG sequence, or sprite sheet. Or save a portable .sbn project to continue later.
The built-in MCP bridge exposes SpineBones to Claude and other MCP-compatible tools. Generate rigs, insert keyframes, and trigger exports — all from natural language commands or automated pipelines.
From web-ready video to game-engine sprites — one animator, every pipeline.
Export the full animation as a .webm file, ready for web or social media. Includes background image if active.
Frame-by-frame transparent PNGs bundled into a ZIP — drop straight into After Effects, DaVinci Resolve, or any compositor.
Packed sprite sheet with atlas data — plug directly into game engines and 2D frameworks.
Portable project package with all bones, slots, keyframes, and bundled image assets — share and reopen anywhere.
Free to download. No account required. Available for macOS and Windows.
macOS 12+ · Windows 10+