diff --git a/tools/html-to-pptx/README.md b/tools/html-to-pptx/README.md
new file mode 100644
index 00000000..c96f2f1d
--- /dev/null
+++ b/tools/html-to-pptx/README.md
@@ -0,0 +1,86 @@
+# HTML deck to PPTX
+
+This tool renders a ThothII HTML deck as one full-bleed PNG per slide and assembles
+those images into a 16:9 PowerPoint file with native speaker notes and document
+metadata. The HTML and notes JSON under `presentations/` are the editable sources;
+the PPTX is a rendered release artifact.
+
+Using images preserves the web typography and fine CSS details across machines. The
+tradeoff is that slide text is not editable in PowerPoint. Speaker notes remain native
+and editable.
+
+## Requirements
+
+- Node.js 18 or newer and npm.
+- Playwright's Chromium build.
+- Network access while rendering the current deck, because its Fraunces and Manrope
+ fonts are loaded from Google Fonts. The render is therefore not fully hermetic.
+
+Install the locked JavaScript dependencies and Chromium from the repository root:
+
+```bash
+npm ci --prefix tools/html-to-pptx
+npx --prefix tools/html-to-pptx playwright install chromium
+```
+
+Dependencies are local to this tool. The scripts intentionally do not use globally
+installed npm packages.
+
+## Render slides
+
+Use a dedicated render directory. The renderer removes stale files matching
+`NN.png`, writes fresh slide images, and creates a raw `notes.json` containing the
+title extracted from each slide.
+
+```bash
+npm --prefix tools/html-to-pptx run render -- \
+ presentations/.html \
+ --hide ".hud button,.hint"
+```
+
+The HTML deck must expose `.slide` elements activated by `#N` hash routes. Optional
+rendering flags are `--scale`, `--width`, and `--height`; their defaults are `2`,
+`1600`, and `900`.
+
+## Build the PowerPoint file
+
+Keep refined speaker notes in `presentations/.notes.json`, using the shape
+`{"1": "...", "2": "..."}`. Pass that file instead of the raw titles generated
+during rendering:
+
+```bash
+npm --prefix tools/html-to-pptx run build -- \
+ presentations/.pptx \
+ --notes presentations/.notes.json \
+ --title "..." --author "..." --subject "..."
+```
+
+The output uses the wide PowerPoint layout (13.333 x 7.5 inches), with one image per
+slide. Edit the HTML and rebuild whenever slide content changes.
+
+## Validation
+
+Run the syntax checks with:
+
+```bash
+npm --prefix tools/html-to-pptx test
+```
+
+Before publishing a regenerated deck, inspect at least one PNG at full resolution and
+use `python-pptx` to verify the slide count, the 12192000 x 6858000 EMU page size, and
+one picture per slide. `python-pptx` is an optional, currently unpinned QA dependency;
+it is not needed to render or build the deck.
+
+The locked direct dependencies are Playwright 1.58.0 (Apache-2.0) and PptxGenJS
+3.12.0 (MIT). Their transitive versions and integrity hashes are recorded in
+`package-lock.json`.
+
+### Temporary dependency exception
+
+PptxGenJS 3.12.0 declares `image-size` 1.2.1, which npm flags for the availability-only
+[GHSA-w3rx-r6r6-pgpr](https://github.com/advisories/GHSA-w3rx-r6r6-pgpr) and
+[GHSA-5p2g-fcmc-qvqq](https://github.com/advisories/GHSA-5p2g-fcmc-qvqq) advisories. No patched
+`image-size` release exists as of 2026-08-31, and current PptxGenJS releases retain the dependency.
+The affected parser is not imported by PptxGenJS's published builder path used here; this tool also
+accepts only locally generated PNG slides with explicit dimensions. Do not use it with untrusted
+image inputs. Reassess this exception by 2026-11-29, or sooner when a patched dependency is released.
diff --git a/tools/html-to-pptx/package-lock.json b/tools/html-to-pptx/package-lock.json
new file mode 100644
index 00000000..1f016d33
--- /dev/null
+++ b/tools/html-to-pptx/package-lock.json
@@ -0,0 +1,217 @@
+{
+ "name": "thothii-html-to-pptx",
+ "lockfileVersion": 3,
+ "requires": true,
+ "packages": {
+ "": {
+ "name": "thothii-html-to-pptx",
+ "dependencies": {
+ "playwright": "1.58.0",
+ "pptxgenjs": "3.12.0"
+ },
+ "engines": {
+ "node": ">=18"
+ }
+ },
+ "node_modules/@types/node": {
+ "version": "18.19.130",
+ "resolved": "https://registry.npmjs.org/@types/node/-/node-18.19.130.tgz",
+ "integrity": "sha512-GRaXQx6jGfL8sKfaIDD6OupbIHBr9jv7Jnaml9tB7l4v068PAOXqfcujMMo5PhbIs6ggR1XODELqahT2R8v0fg==",
+ "license": "MIT",
+ "dependencies": {
+ "undici-types": "~5.26.4"
+ }
+ },
+ "node_modules/core-util-is": {
+ "version": "1.0.3",
+ "resolved": "https://registry.npmjs.org/core-util-is/-/core-util-is-1.0.3.tgz",
+ "integrity": "sha512-ZQBvi1DcpJ4GDqanjucZ2Hj3wEO5pZDS89BWbkcrvdxksJorwUDDZamX9ldFkp9aw2lmBDLgkObEA4DWNJ9FYQ==",
+ "license": "MIT"
+ },
+ "node_modules/fsevents": {
+ "version": "2.3.2",
+ "resolved": "https://registry.npmjs.org/fsevents/-/fsevents-2.3.2.tgz",
+ "integrity": "sha512-xiqMQR4xAeHTuB9uWm+fFRcIOgKBMiOBP+eXiyT7jsgVCq1bkVygt00oASowB7EdtpOHaaPgKt812P9ab+DDKA==",
+ "hasInstallScript": true,
+ "license": "MIT",
+ "optional": true,
+ "os": [
+ "darwin"
+ ],
+ "engines": {
+ "node": "^8.16.0 || ^10.6.0 || >=11.0.0"
+ }
+ },
+ "node_modules/https": {
+ "version": "1.0.0",
+ "resolved": "https://registry.npmjs.org/https/-/https-1.0.0.tgz",
+ "integrity": "sha512-4EC57ddXrkaF0x83Oj8sM6SLQHAWXw90Skqu2M4AEWENZ3F02dFJE/GARA8igO79tcgYqGrD7ae4f5L3um2lgg==",
+ "license": "ISC"
+ },
+ "node_modules/image-size": {
+ "version": "1.2.1",
+ "resolved": "https://registry.npmjs.org/image-size/-/image-size-1.2.1.tgz",
+ "integrity": "sha512-rH+46sQJ2dlwfjfhCyNx5thzrv+dtmBIhPHk0zgRUukHzZ/kRueTJXoYYsclBaKcSMBWuGbOFXtioLpzTb5euw==",
+ "license": "MIT",
+ "dependencies": {
+ "queue": "6.0.2"
+ },
+ "bin": {
+ "image-size": "bin/image-size.js"
+ },
+ "engines": {
+ "node": ">=16.x"
+ }
+ },
+ "node_modules/immediate": {
+ "version": "3.0.6",
+ "resolved": "https://registry.npmjs.org/immediate/-/immediate-3.0.6.tgz",
+ "integrity": "sha512-XXOFtyqDjNDAQxVfYxuF7g9Il/IbWmmlQg2MYKOH8ExIT1qg6xc4zyS3HaEEATgs1btfzxq15ciUiY7gjSXRGQ==",
+ "license": "MIT"
+ },
+ "node_modules/inherits": {
+ "version": "2.0.4",
+ "resolved": "https://registry.npmjs.org/inherits/-/inherits-2.0.4.tgz",
+ "integrity": "sha512-k/vGaX4/Yla3WzyMCvTQOXYeIHvqOKtnqBduzTHpzpQZzAskKMhZ2K+EnBiSM9zGSoIFeMpXKxa4dYeZIQqewQ==",
+ "license": "ISC"
+ },
+ "node_modules/isarray": {
+ "version": "1.0.0",
+ "resolved": "https://registry.npmjs.org/isarray/-/isarray-1.0.0.tgz",
+ "integrity": "sha512-VLghIWNM6ELQzo7zwmcg0NmTVyWKYjvIeM83yjp0wRDTmUnrM678fQbcKBo6n2CJEF0szoG//ytg+TKla89ALQ==",
+ "license": "MIT"
+ },
+ "node_modules/jszip": {
+ "version": "3.10.1",
+ "resolved": "https://registry.npmjs.org/jszip/-/jszip-3.10.1.tgz",
+ "integrity": "sha512-xXDvecyTpGLrqFrvkrUSoxxfJI5AH7U8zxxtVclpsUtMCq4JQ290LY8AW5c7Ggnr/Y/oK+bQMbqK2qmtk3pN4g==",
+ "license": "(MIT OR GPL-3.0-or-later)",
+ "dependencies": {
+ "lie": "~3.3.0",
+ "pako": "~1.0.2",
+ "readable-stream": "~2.3.6",
+ "setimmediate": "^1.0.5"
+ }
+ },
+ "node_modules/lie": {
+ "version": "3.3.0",
+ "resolved": "https://registry.npmjs.org/lie/-/lie-3.3.0.tgz",
+ "integrity": "sha512-UaiMJzeWRlEujzAuw5LokY1L5ecNQYZKfmyZ9L7wDHb/p5etKaxXhohBcrw0EYby+G/NA52vRSN4N39dxHAIwQ==",
+ "license": "MIT",
+ "dependencies": {
+ "immediate": "~3.0.5"
+ }
+ },
+ "node_modules/pako": {
+ "version": "1.0.11",
+ "resolved": "https://registry.npmjs.org/pako/-/pako-1.0.11.tgz",
+ "integrity": "sha512-4hLB8Py4zZce5s4yd9XzopqwVv/yGNhV1Bl8NTmCq1763HeK2+EwVTv+leGeL13Dnh2wfbqowVPXCIO0z4taYw==",
+ "license": "(MIT AND Zlib)"
+ },
+ "node_modules/playwright": {
+ "version": "1.58.0",
+ "resolved": "https://registry.npmjs.org/playwright/-/playwright-1.58.0.tgz",
+ "integrity": "sha512-2SVA0sbPktiIY/MCOPX8e86ehA/e+tDNq+e5Y8qjKYti2Z/JG7xnronT/TXTIkKbYGWlCbuucZ6dziEgkoEjQQ==",
+ "license": "Apache-2.0",
+ "dependencies": {
+ "playwright-core": "1.58.0"
+ },
+ "bin": {
+ "playwright": "cli.js"
+ },
+ "engines": {
+ "node": ">=18"
+ },
+ "optionalDependencies": {
+ "fsevents": "2.3.2"
+ }
+ },
+ "node_modules/playwright-core": {
+ "version": "1.58.0",
+ "resolved": "https://registry.npmjs.org/playwright-core/-/playwright-core-1.58.0.tgz",
+ "integrity": "sha512-aaoB1RWrdNi3//rOeKuMiS65UCcgOVljU46At6eFcOFPFHWtd2weHRRow6z/n+Lec0Lvu0k9ZPKJSjPugikirw==",
+ "license": "Apache-2.0",
+ "bin": {
+ "playwright-core": "cli.js"
+ },
+ "engines": {
+ "node": ">=18"
+ }
+ },
+ "node_modules/pptxgenjs": {
+ "version": "3.12.0",
+ "resolved": "https://registry.npmjs.org/pptxgenjs/-/pptxgenjs-3.12.0.tgz",
+ "integrity": "sha512-ZozkYKWb1MoPR4ucw3/aFYlHkVIJxo9czikEclcUVnS4Iw/M+r+TEwdlB3fyAWO9JY1USxJDt0Y0/r15IR/RUA==",
+ "license": "MIT",
+ "dependencies": {
+ "@types/node": "^18.7.3",
+ "https": "^1.0.0",
+ "image-size": "^1.0.0",
+ "jszip": "^3.7.1"
+ }
+ },
+ "node_modules/process-nextick-args": {
+ "version": "2.0.1",
+ "resolved": "https://registry.npmjs.org/process-nextick-args/-/process-nextick-args-2.0.1.tgz",
+ "integrity": "sha512-3ouUOpQhtgrbOa17J7+uxOTpITYWaGP7/AhoR3+A+/1e9skrzelGi/dXzEYyvbxubEF6Wn2ypscTKiKJFFn1ag==",
+ "license": "MIT"
+ },
+ "node_modules/queue": {
+ "version": "6.0.2",
+ "resolved": "https://registry.npmjs.org/queue/-/queue-6.0.2.tgz",
+ "integrity": "sha512-iHZWu+q3IdFZFX36ro/lKBkSvfkztY5Y7HMiPlOUjhupPcG2JMfst2KKEpu5XndviX/3UhFbRngUPNKtgvtZiA==",
+ "license": "MIT",
+ "dependencies": {
+ "inherits": "~2.0.3"
+ }
+ },
+ "node_modules/readable-stream": {
+ "version": "2.3.8",
+ "resolved": "https://registry.npmjs.org/readable-stream/-/readable-stream-2.3.8.tgz",
+ "integrity": "sha512-8p0AUk4XODgIewSi0l8Epjs+EVnWiK7NoDIEGU0HhE7+ZyY8D1IMY7odu5lRrFXGg71L15KG8QrPmum45RTtdA==",
+ "license": "MIT",
+ "dependencies": {
+ "core-util-is": "~1.0.0",
+ "inherits": "~2.0.3",
+ "isarray": "~1.0.0",
+ "process-nextick-args": "~2.0.0",
+ "safe-buffer": "~5.1.1",
+ "string_decoder": "~1.1.1",
+ "util-deprecate": "~1.0.1"
+ }
+ },
+ "node_modules/safe-buffer": {
+ "version": "5.1.2",
+ "resolved": "https://registry.npmjs.org/safe-buffer/-/safe-buffer-5.1.2.tgz",
+ "integrity": "sha512-Gd2UZBJDkXlY7GbJxfsE8/nvKkUEU1G38c1siN6QP6a9PT9MmHB8GnpscSmMJSoF8LOIrt8ud/wPtojys4G6+g==",
+ "license": "MIT"
+ },
+ "node_modules/setimmediate": {
+ "version": "1.0.5",
+ "resolved": "https://registry.npmjs.org/setimmediate/-/setimmediate-1.0.5.tgz",
+ "integrity": "sha512-MATJdZp8sLqDl/68LfQmbP8zKPLQNV6BIZoIgrscFDQ+RsvK/BxeDQOgyxKKoh0y/8h3BqVFnCqQ/gd+reiIXA==",
+ "license": "MIT"
+ },
+ "node_modules/string_decoder": {
+ "version": "1.1.1",
+ "resolved": "https://registry.npmjs.org/string_decoder/-/string_decoder-1.1.1.tgz",
+ "integrity": "sha512-n/ShnvDi6FHbbVfviro+WojiFzv+s8MPMHBczVePfUpDJLwoLT0ht1l4YwBCbi8pJAveEEdnkHyPyTP/mzRfwg==",
+ "license": "MIT",
+ "dependencies": {
+ "safe-buffer": "~5.1.0"
+ }
+ },
+ "node_modules/undici-types": {
+ "version": "5.26.5",
+ "resolved": "https://registry.npmjs.org/undici-types/-/undici-types-5.26.5.tgz",
+ "integrity": "sha512-JlCMO+ehdEIKqlFxk6IfVoAUVmgz7cU7zD/h9XZ0qzeosSHmUJVOzSQvvYSYWXkFXC+IfLKSIffhv0sVZup6pA==",
+ "license": "MIT"
+ },
+ "node_modules/util-deprecate": {
+ "version": "1.0.2",
+ "resolved": "https://registry.npmjs.org/util-deprecate/-/util-deprecate-1.0.2.tgz",
+ "integrity": "sha512-EPD5q1uXyFxJpCrLnCc1nHnq3gOa6DZBocAIiI2TaSCA7VCJ1UJDMagCzIkXNsUYfD1daK//LTEQ8xiIbrHtcw==",
+ "license": "MIT"
+ }
+ }
+}
diff --git a/tools/html-to-pptx/package.json b/tools/html-to-pptx/package.json
new file mode 100644
index 00000000..04e88a97
--- /dev/null
+++ b/tools/html-to-pptx/package.json
@@ -0,0 +1,18 @@
+{
+ "name": "thothii-html-to-pptx",
+ "private": true,
+ "type": "module",
+ "engines": {
+ "node": ">=18"
+ },
+ "scripts": {
+ "build": "node scripts/build.mjs",
+ "check": "node --check scripts/render.mjs && node --check scripts/build.mjs",
+ "render": "node scripts/render.mjs",
+ "test": "npm run check"
+ },
+ "dependencies": {
+ "playwright": "1.58.0",
+ "pptxgenjs": "3.12.0"
+ }
+}
diff --git a/tools/html-to-pptx/scripts/build.mjs b/tools/html-to-pptx/scripts/build.mjs
new file mode 100644
index 00000000..095d87f1
--- /dev/null
+++ b/tools/html-to-pptx/scripts/build.mjs
@@ -0,0 +1,69 @@
+#!/usr/bin/env node
+// Assemble rendered slide PNGs into a 16:9 PPTX: one full-bleed image per slide,
+// native speaker notes, document metadata.
+//
+// Usage:
+// node build.mjs [--notes notes.json] [--title T] [--author A] [--subject S]
+import { createRequire } from 'node:module';
+import { existsSync, readdirSync, readFileSync } from 'node:fs';
+import path from 'node:path';
+
+const require = createRequire(import.meta.url);
+const PptxGenJS = require('pptxgenjs');
+
+const args = process.argv.slice(2);
+if (!args[0] || !args[1]) {
+ console.error(
+ 'usage: node build.mjs [--notes notes.json] [--title T] [--author A] [--subject S]',
+ );
+ process.exit(1);
+}
+
+const invocationDir = process.env.INIT_CWD || process.cwd();
+const dir = path.resolve(invocationDir, args[0]);
+const out = path.resolve(invocationDir, args[1]);
+const opt = (flag, fallback) => {
+ const index = args.indexOf(flag);
+ return index >= 0 ? args[index + 1] : fallback;
+};
+
+const presentation = new PptxGenJS();
+presentation.layout = 'LAYOUT_WIDE'; // 13.333 x 7.5 in
+presentation.title = opt('--title', path.basename(out, '.pptx'));
+presentation.author = opt('--author', 'ThothII');
+presentation.subject = opt('--subject', '');
+
+const notesOption = opt('--notes', null);
+const notesPath = notesOption
+ ? path.resolve(invocationDir, notesOption)
+ : path.join(dir, 'notes.json');
+const notes = existsSync(notesPath)
+ ? JSON.parse(readFileSync(notesPath, 'utf8'))
+ : {};
+
+const pngs = readdirSync(dir)
+ .filter(file => /^\d+\.png$/.test(file))
+ .sort((left, right) => Number.parseInt(left, 10) - Number.parseInt(right, 10));
+if (pngs.length === 0) {
+ console.error('no NN.png files in ' + dir);
+ process.exit(1);
+}
+
+for (const file of pngs) {
+ const slideNumber = Number.parseInt(file, 10);
+ const slide = presentation.addSlide();
+ slide.background = { color: 'FCFAFA' };
+ slide.addImage({
+ path: path.join(dir, file),
+ x: 0,
+ y: 0,
+ w: 13.333,
+ h: 7.5,
+ });
+ if (notes[slideNumber]) {
+ slide.addNotes(notes[slideNumber]);
+ }
+}
+
+await presentation.writeFile({ fileName: out });
+console.log('built', out, '-', pngs.length, 'slides');
diff --git a/tools/html-to-pptx/scripts/render.mjs b/tools/html-to-pptx/scripts/render.mjs
new file mode 100644
index 00000000..8342b166
--- /dev/null
+++ b/tools/html-to-pptx/scripts/render.mjs
@@ -0,0 +1,111 @@
+#!/usr/bin/env node
+// Render each slide of a ThothII-style HTML deck to a high-res PNG.
+// Assumes the deck exposes .slide sections navigable via #N hash routes.
+//
+// Usage:
+// node render.mjs [--hide "sel1,sel2"] [--scale 2] [--width 1600] [--height 900]
+//
+// Output: /01.png .. NN.png + /notes.json (slide number -> title text)
+import { createRequire } from 'node:module';
+import {
+ existsSync,
+ mkdirSync,
+ readdirSync,
+ unlinkSync,
+ writeFileSync,
+} from 'node:fs';
+import path from 'node:path';
+import { pathToFileURL } from 'node:url';
+
+const require = createRequire(import.meta.url);
+const { chromium } = require('playwright');
+
+const args = process.argv.slice(2);
+if (!args[0] || !args[1]) {
+ console.error(
+ 'usage: node render.mjs [--hide "sel1,sel2"] [--scale 2] [--width 1600] [--height 900]',
+ );
+ process.exit(1);
+}
+
+const invocationDir = process.env.INIT_CWD || process.cwd();
+const html = path.resolve(invocationDir, args[0]);
+const outdir = path.resolve(invocationDir, args[1]);
+if (!existsSync(html)) {
+ console.error('HTML deck not found: ' + html);
+ process.exit(1);
+}
+
+const opt = (flag, fallback) => {
+ const index = args.indexOf(flag);
+ return index >= 0 ? args[index + 1] : fallback;
+};
+const hide = (opt('--hide', '') || '')
+ .split(',')
+ .map(selector => selector.trim())
+ .filter(Boolean);
+const scale = Number(opt('--scale', '2'));
+const width = Number(opt('--width', '1600'));
+const height = Number(opt('--height', '900'));
+
+mkdirSync(outdir, { recursive: true });
+
+let browser;
+try {
+ browser = await chromium.launch();
+ const page = await browser.newPage({
+ viewport: { width, height },
+ deviceScaleFactor: scale,
+ reducedMotion: 'reduce',
+ });
+ await page.goto(pathToFileURL(html).href, { waitUntil: 'networkidle' });
+ await page.evaluate(() => document.fonts.ready);
+ if (hide.length) {
+ await page.addStyleTag({
+ content: hide
+ .map(selector => `${selector}{display:none!important}`)
+ .join('\n'),
+ });
+ }
+
+ const count = await page.locator('.slide').count();
+ if (count === 0) {
+ throw new Error('no .slide elements found in ' + html);
+ }
+
+ for (const entry of readdirSync(outdir)) {
+ if (/^\d+\.png$/.test(entry)) {
+ unlinkSync(path.join(outdir, entry));
+ }
+ }
+
+ const notes = {};
+ for (let index = 1; index <= count; index++) {
+ await page.evaluate(slideNumber => {
+ location.hash = '#' + slideNumber;
+ }, index);
+ await page.waitForFunction(slideNumber => {
+ const slide = document.querySelectorAll('.slide')[slideNumber - 1];
+ return Boolean(slide) && slide.classList.contains('on');
+ }, index);
+ await page.waitForTimeout(450); // let the crossfade settle
+
+ const file = path.join(outdir, String(index).padStart(2, '0') + '.png');
+ await page.screenshot({ path: file });
+ notes[index] = await page.evaluate(slideNumber => {
+ const slide = document.querySelectorAll('.slide')[slideNumber - 1];
+ const title = slide.querySelector('.title, .cover-mark');
+ const text = title ? title.innerText.trim().replace(/\s+/g, ' ') : '';
+ return text || slide.getAttribute('aria-label') || '';
+ }, index);
+ console.log('rendered', file);
+ }
+
+ writeFileSync(
+ path.join(outdir, 'notes.json'),
+ JSON.stringify(notes, null, 2),
+ );
+ console.log('done:', count, 'slides ->', outdir);
+} finally {
+ await browser?.close();
+}