WeebPaint
WeebPaint is an open-source painting and illustration app that runs in the browser — on iPad, Android tablets, and desktops. Brush feel and fill tools are tuned on anime workflows; pixel art, hand-painted textures, and light image editing use the same toolset. No account, no installation, no server — and a cloud-synced gallery you control.
as-of v0.11.44 · 2026-08-28
Features
Painting
- Pressure-sensitive brushes with stroke smoothing / stabilization; pen tablet, Apple Pencil, mouse, and touch input.
- Custom brushes; brush libraries can be imported and exported.
- Shape brushes; stamp workflow (transform a shape and stamp it repeatedly).
- Pixel brushes (integer-aligned, no anti-aliasing) and nearest-neighbor / RotSprite transforms.
- Liquify (push, pinch, bloat, twirl, restore).
- Color adjustments (hue / saturation and others).
- Time-lapse recording with mp4 export.
Layers
- Layer groups (nestable), clipping masks, layer masks, blend modes, opacity, merge.
- Reference layer: fill and magic wand read line art from one layer while you paint on another.
- Reference window to keep a source image on screen.
Selection and fill
- Freehand / rectangle / polygon lasso; magic wand; select all / invert / deselect.
- Transform: free, uniform, and perspective; arrow-key pixel nudge.
- Fill with line-art gap closing; fills extend under the line to avoid white edges.
Files
- Projects are standard OpenRaster .ora files: rename to .zip and every layer is a PNG inside. GIMP and Krita open them.
- psd and png export; clipboard copy / paste to and from other apps.
- Local gallery with thumbnails, rename, save-as, image import.
- Per-artwork password protection: an encrypted artwork is stored as ciphertext both locally and in the cloud; the password is never stored or uploaded, and a forgotten password cannot be recovered.
Platform
- Installable PWA, fully offline once installed.
- UI languages: English, 日本語, 中文, toki pona.
- OneDrive sync — see status below. Cloud changes are pulled automatically; local changes upload when you save or leave the artwork. The app can only access its own
Apps/WeebPaint/ folder, nothing else in the drive. Concurrent edits on two devices are never blindly overwritten: a panel asks which side to keep, and the replaced version is kept as a backup. Details: docs/cloud-sync.md.
Cloud sync status (2026-08-28)
WeebPaint supports OneDrive sync, and existing authorizations work. What is broken right now is onboarding: OneDrive has a supplier-side fault that blocks new sign-ins from getting drive access.
Since late August 2026, a newly granted Files.ReadWrite.AppFolder authorization gets 403 serviceReadOnly on every OneDrive request, while grants made months ago keep working — verified with the same code and account minutes apart. The app-folder consent path appears to skip a one-time provisioning step on Microsoft's side. We reported it in Microsoft Q&A 5983388; two independent reproductions so far, no Microsoft response yet. See also Q&A 5982450 (a Microsoft moderator attributes the 403s to a Graph service-side problem) and rclone#9794.
A workaround is known — granting the app full-drive access once provisions the folder permanently — but this app will not ask users for full-drive permission; app-folder-only access is deliberate and permanent. Until Microsoft fixes provisioning, use WeebPaint without signing in: everything else works, files stay on the device, and .ora export works as backup. This section will be updated when the situation changes. Details: docs/cloud-sync.md.
Shortcuts and gestures
Shortcuts follow Procreate / Photoshop / Blender where possible. The authoritative list is in-app: menu → "Shortcuts", updated automatically each release. A generated copy: docs/shortcuts.md.
Basics: B brush, E eraser, two-finger tap undo, three-finger tap redo, pinch to zoom / rotate, Ctrl+S save (also pushes to the cloud when signed in).
Install as an app (PWA)
Open https://weebpaint.com/ in the browser, then:
- iPad / iPhone (Safari): Share → "Add to Home Screen".
- Windows / Mac (Chrome / Edge): install icon in the address bar, or menu → "Install WeebPaint".
- Mac (Safari 17+): File → "Add to Dock".
FAQ
- No pen pressure on Windows: enable Windows Ink in your tablet driver (Huion / XP-Pen / Wacom panel), then fully restart the browser — browsers only receive pen pressure through Windows Ink. This doesn't conflict with Clip Studio or Photoshop: they can keep using WinTab.
Roadmap
Planned, in no particular order:
- Blender link: edit a texture in WeebPaint, push it into Blender's memory over local WebRTC.
- Optional AI tools (line-art cleanup, upscaling) with a user-supplied API key, stored locally.
- Painting directly on 3D models.
- Smudge / color-mixing brushes; textured brushes.
- Seamless-tile preview for texture work.
- Storage providers and mirrors usable in mainland China.
Self-hosting
The site is fully static; a fork can be built and hosted anywhere. Build and deployment: docs/self-hosting.md. OneDrive sync on your own deployment (your own Azure client id): docs/onedrive-client-id.md.
Technical notes
- Rendering uses WebGL2. Every mainstream browser since about 2021 has it (on iPhone / iPad: iOS 15 or later); there is nothing to install. Unsupported browsers get an error message.
- The
/dev/ path on weebpaint.com serves the development branch. It is a working area — sometimes deliberately broken mid-change — and it shares local data and the OneDrive folder with the release channel. It is not a nightly channel.
License
MIT. Commercial use and closed-source forks are permitted. Most of the code was written with Claude Code.
