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README.md

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+# Flipnote Editor
+
+A browser animation editor extracted from RexiMemo. The drawing interface is
+the same: a 256×192 canvas, two ink layers, eight playback speeds, drawing and
+paint tools, selections, transforms, text, onion skin and sound tracks.
+
+This version runs on its own. It has no accounts, site navigation, online
+library or server API. Files selected in the editor are read by your browser.
+They are not sent anywhere.
+
+## Run it
+
+With Node.js 18 or newer:
+
+```sh
+npm start
+```
+
+Open **http://localhost:8090**. No dependency installation or build step is
+needed. Alternatively, serve this folder with any static web server, for example:
+
+```sh
+python -m http.server 8090 --bind 127.0.0.1
+```
+
+Use localhost or HTTPS for microphone recording. Opening `index.html` directly
+from disk is not supported because the text renderer loads local JSON.
+For static hosting, copy the whole folder. Asset paths also work in a subdirectory.
+
+## Files and audio
+
+- **Tab 5 → Open .PPM** reads a Flipnote Studio file from your device, including
+  its pages, ink colours, paper, hidden layers, sound effects and playback speed.
+- **Tab 4** records music and three sound effects. Hold Shift while clicking an
+  audio button to import an MP3 or WAV and trim it.
+- **Tab 4 → Import Image** accepts local images and clipboard pastes.
+- **Tab 5 → Save .WEBM** renders the animation and its audio into a video.
+
+PPM writing, signing and online uploads are absent. WebM is the only animation
+output. There is no editable project save format or automatic project backup;
+keep the page open until you have finished. The browser asks before closing a
+changed project. Tool preferences and keyboard shortcuts stay on your device.
+
+Open the editor's settings button for zoom, the pixel grid, the desktop Shift
+button and remappable shortcuts. The pixel grid appears at 400% zoom and above.
+Text uses **Shift+T** by default.
+
+## Source layout
+
+| File | Purpose |
+| --- | --- |
+| `index.html` | Editor controls and dialogs |
+| `assets/editor.css` | Original editor styling and shared form rules |
+| `assets/bootstrap.js` | Asset loading, input fixes and touch Shift control |
+| `assets/flipnote-editor/editor.js` | Drawing, pages, selection, audio and video rendering |
+| `assets/flipnote-editor/drawing-engine.js` | Brush and paint behaviour |
+| `assets/flipnote-editor/text-tool.js` | Pixel text tool |
+| `assets/ppm-import.js` | Local PPM import adapter |
+| `assets/vendor/flipnote.js` | Bundled PPM decoder |
+| `tools/serve.cjs` | Optional local static file server |
+
+Run `npm test` for the local import and release checks. Tests do not contact
+RexiMemo or require an account. The original RexiMemo editor is not modified by
+this standalone version.
+
+## Licence
+
+The editor code follows the source project's GNU AGPL version 3 licence. See
+`LICENSE`. Bundled dependencies retain their own licences. Additional credits
+are listed in `CREDITS.md`.