One native binary
Serve the editor, automate drawings, inspect files, and export PNG or SVG without a Node stack.
Open-source vector infrastructure
Design is a file again.
Pentool is a vector editor built for humans and agents. Draw through the CLI, refine in the browser, and ship editable work as open .pen files.
pentool serveThen open 127.0.0.1:4711. No database. No account. No cloud required.
poster.pen
LAYERS
▾ hero
◇ nib
T title
▸ footer
editable • 4 layersOne workflow. Two collaborators.
CLI precisionVisual editingOpen files
Why Pentool
The whole design stays yours.
No proprietary canvas hiding behind an API. Pentool makes the document format, renderer, automation surface, and package protocol part of the same open system.
Readable by default
Every .pen document is structured JSON: pages, layers, paths, text, fonts, and stable IDs included.
Human + agent
Agents use precise CLI commands. Humans open the same file in a visual browser canvas. Nobody gets a flattened artifact.
Open packages
Pack, sign, publish, mirror, and install design libraries with the host-independent .penpkg protocol.
From prompt to pixels
terminal
$ pentool new poster.pen --width 1200 --height 800 $ pentool rect poster.pen card 80 80 520 640 $ pentool text poster.pen title "Open by design" 120 160 $ pentool export poster.pen poster.svg
Every command preserves structure.
Libraries without lock-in.
Any document, page, layer, object list, or selection can become a reusable asset. Publish deterministic .penpkg archives to GitHub Releases, static storage, or your own registry.
# build and verify
$ pentool package pack ./open-ui
$ pentool package verify open-ui.penpkg
# publish anywhere
$ pentool package publish open-ui.penpkg
# install reproducibly
$ pentool package install open-design/ui@0.1.0
$ pentool package pack ./open-ui
$ pentool package verify open-ui.penpkg
# publish anywhere
$ pentool package publish open-ui.penpkg
# install reproducibly
$ pentool package install open-design/ui@0.1.0
Ready when you are