diff --git a/.gitignore b/.gitignore
index b547b0e..ed7db95 100644
--- a/.gitignore
+++ b/.gitignore
@@ -9,6 +9,11 @@ venv/
 # Node/browser tooling
 node_modules/
 
+# Playwright e2e output
+test-results/
+playwright-report/
+playwright/.cache/
+
 # Build and local output
 build/
 dist/
diff --git a/AGENTS.md b/AGENTS.md
index 53aa6f5..f5db780 100644
--- a/AGENTS.md
+++ b/AGENTS.md
@@ -37,3 +37,12 @@ pytest -q
 ```
 
 For visual or print changes, also run a local static server and inspect the site root (`/`) in a browser.
+
+Cross-browser end-to-end tests live in `e2e/` (Playwright; Chromium, Firefox, WebKit, plus mobile emulations). Run them after changes that touch rendering, print, key generation, URL/redirect handling, or the loading state:
+
+```bash
+npm install && npx playwright install
+npm run test:e2e
+```
+
+WebKit/Safari on Linux needs `sudo npx playwright install-deps` once. See `e2e/README.md`. Test tooling is a dev dependency only — it must not pull runtime frontend dependencies from CDNs or otherwise weaken the static, host-agnostic client.
diff --git a/README.md b/README.md
index cde6e57..64a3bbc 100644
--- a/README.md
+++ b/README.md
@@ -1,11 +1,24 @@
 # VoxVera
 
-VoxVera is now a static Nostr-powered flyer client.
+VoxVera is a static, Nostr-powered flyer client.
 
-The active app lives at the site root ([`site/`](site/)). It lets a user author flyer content, publish it as a public Nostr event, and render the flyer later from an event ID or Nostr address. The frontend is intentionally self-contained: relays store the content, and any static host can serve the client.
+The active app lives at the site root ([`site/`](site/)). It lets anyone author flyer content, publish it as a public Nostr event, and re-render or reprint the flyer later from a Nostr address or event ID — no application server. The frontend is intentionally self-contained: Nostr relays store the content, and any static host can serve the client.
 
 The previous Tor/OnionShare CLI version is preserved on the `legacy-tor` branch.
 
+## Features
+
+- **Author and publish.** Fill in the flyer fields and publish them as a Nostr `30078` parameterized replaceable event. Republishing with the same flyer name replaces the previous version.
+- **Anonymous by default.** The client generates an anonymous browser-side key to sign events. A NIP-07 browser extension is detected and used if present, but is never required.
+- **Open from a link or ID.** Load a flyer from an `naddr`, `nevent1`, `note1`, raw 64-char event ID, or `nostr:` URL. The lookup field tolerates copy/paste whitespace and newlines, so an event ID copied off a printed tear-off (where it wraps across two lines) still resolves.
+- **Short, scannable poster URLs.** Each poster URL is a standard NIP-19 `naddr` carrying a single relay hint, placed in the URL `#fragment` (no `?addr=` query). Shorter URLs make the tear-off QR code easier to scan. Older relay-list `naddr`s and `?addr=` URLs still resolve.
+- **Tear-off tabs.** The printable flyer has ten tear-off tabs. Each tab is a single hyperlinked call to action (the URL is the link, not printed as text) and prints the full event ID so anyone can re-find the flyer by typing it.
+- **Loading state on shared links.** Opening a poster/event link shows a localized "Loading content…" placeholder (and a "Could not load this flyer." state on failure) instead of the default flyer; the default sample content appears only on the bare site URL.
+- **14 languages with RTL support.** Flyer content and UI are localized; right-to-left scripts render correctly. Letter-spacing is applied per script so cursive (Arabic/Persian) and combining (Devanagari) scripts are not broken — see [the spec](docs/nostr-static-client-spec.md#letter-spacing-by-script).
+- **Fits-the-page editing.** Fields that would overflow the printable sheet are rejected as you type, with an inline error under the affected field. See the [field length cheat sheet](docs/flyer-field-limits.md) for how much text fits each field per language.
+- **QR codes.** The tear-off QR points at the poster URL (re-open and reprint); the main flyer QR points at the creator's content URL.
+- **Self-contained.** No build step and no CDNs — Nostr and QR libraries are vendored under `site/vendor/`.
+
 ## What Is In `main`
 
 - `site/index.html`, `site/nostr-client.js`, `site/nostr-client.css`, `site/locales.js`: static editor/viewer client
@@ -14,6 +27,7 @@ The previous Tor/OnionShare CLI version is preserved on the `legacy-tor` branch.
 - `site/CNAME`: custom-domain target
 - `voxvera/nostr/`: small Python schema/validation helpers
 - `docs/nostr-static-client-spec.md`: design notes and development plan
+- `docs/flyer-field-limits.md`: per-language field length cheat sheet
 
 ## Local Development
 
@@ -45,11 +59,23 @@ The client is served from the domain root (`site/index.html`). `site/nostr/index
 ## Verification
 
 ```bash
-node --check site/nostr-client.js
-pytest -q
+node --check site/nostr-client.js   # client syntax
+pytest -q                           # Nostr source schema
 ```
 
-The Python tests only cover the Nostr source schema. The frontend is static and should be checked in-browser for layout and print behavior after UI changes.
+### Cross-browser end-to-end tests
+
+[Playwright](https://playwright.dev) smoke tests run the client on Chromium, Firefox, and WebKit (Safari's engine), plus Android/iOS mobile emulations — covering rendering, the `@media print` path, WebCrypto key generation, the `/nostr/` redirect, and the loading state.
+
+```bash
+npm install
+npx playwright install     # download the browser engines
+npm run test:e2e
+```
+
+See [`e2e/README.md`](e2e/README.md) for per-engine coverage and the one-time Linux step for WebKit (`sudo npx playwright install-deps`).
+
+The Python tests only cover the Nostr source schema. The frontend is static; the Playwright suite covers engine behavior, but real Safari/iOS print and clipboard behavior is still worth a manual pass before a release.
 
 ## License
 
diff --git a/docs/flyer-field-limits.md b/docs/flyer-field-limits.md
new file mode 100644
index 0000000..927ffe8
--- /dev/null
+++ b/docs/flyer-field-limits.md
@@ -0,0 +1,70 @@
+# Flyer Field Length Cheat Sheet
+
+How much text fits in each flyer field, by script.
+
+VoxVera does **not** impose a fixed character count. The editor measures the
+rendered flyer live and rejects a keystroke the moment a field would overflow
+the printable sheet (you'll see an inline "too long" error under that field).
+So the real limit is enforced for you as you type — the numbers below are
+practical guidance for drafting copy, sizing translations, or prompting an LLM
+to write flyer text that will fit on the first try.
+
+Capacity varies by **script**, not by individual language, for three reasons:
+
+1. The flyer body font is monospace (`Courier New`), so within a script every
+   character takes the same width regardless of upper/lowercase.
+2. Per-script letter-spacing policy (`ls-full` / `ls-cjk` / `ls-none`, see
+   [`nostr-static-client-spec.md`](nostr-static-client-spec.md#letter-spacing-by-script)).
+3. Glyph width differs by script — CJK glyphs are full-width (≈2× a Latin
+   character), Devanagari fallback glyphs are narrower, etc.
+
+## Single-line fields (hard caps)
+
+**Title**, **Subtitle**, and **Headline** are single-line: they never wrap, so
+these are the limits people actually run into. Counts are characters
+(codepoints).
+
+| Languages | Title | Headline | Subtitle |
+|---|---|---|---|
+| Latin & Cyrillic & Hebrew — en, es, de, fr, pt, sw, tr, ru, he | ~28 | ~28 | ~32 |
+| Arabic & Persian — ar, fa | ~28 | ~28 | ~38 |
+| Devanagari — hi | ~36 | ~36 | ~51 |
+| CJK — ja, zh | ~17 | ~17 | ~23 |
+
+## Multi-line fields (generous)
+
+**Body** (content), **Link message** (`url_message`), and **Footer**
+(`footer_message`) wrap across multiple lines, so they hold far more and are
+bounded only by the remaining height of the sheet.
+
+| Languages | Body (content) |
+|---|---|
+| Latin & Cyrillic & Hebrew | ~1,900 (a few hundred words) |
+| Arabic & Persian | ~1,850 |
+| Devanagari — hi | ~2,450 |
+| CJK — ja, zh | ~1,170 |
+
+`url_message` and `footer_message` share the lower portion of the sheet and can
+hold roughly 1,200–4,800 characters depending on script, but for a readable
+flyer keep the link message to a sentence and the footer to a short line.
+
+The **URL** field is a link, not body copy — keep it short both because it's
+shown verbatim on the flyer and because it becomes the main QR code (shorter
+URLs scan more reliably).
+
+## Notes and caveats
+
+- **Approximate.** These come from rendering each script in a headless browser
+  at true print size (8.5in × 11in, content column 4.75in). The
+  Latin/Cyrillic numbers (`Courier New`) are the most reliable; numbers for
+  Hebrew, Arabic, Persian, Devanagari, and CJK depend on the system fallback
+  font, which can differ slightly between devices and from print output.
+- **The app is authoritative.** If the editor accepts your text it fits; if it
+  rejects it, shorten it. Treat this sheet as a target, not a contract.
+- **Redaction markup counts.** Wrapping text in `~~double tildes~~` renders it
+  struck-through; the four `~` characters count toward the field length even
+  though they don't appear on the flyer.
+- **Re-measuring.** If the flyer layout, font, or letter-spacing policy
+  changes, these numbers should be re-derived by rendering each script at print
+  size and binary-searching each field for the largest run of characters that
+  does not overflow the field target or the sheet.
diff --git a/e2e/README.md b/e2e/README.md
new file mode 100644
index 0000000..8f3a429
--- /dev/null
+++ b/e2e/README.md
@@ -0,0 +1,58 @@
+# Cross-browser end-to-end tests
+
+[Playwright](https://playwright.dev) smoke tests that exercise the static client
+on every major browser engine and on mobile emulations, so a change that works
+in Chrome can be confirmed to work in Firefox and Safari (WebKit) too.
+
+## Coverage
+
+Projects are defined in [`../playwright.config.js`](../playwright.config.js):
+
+| Project | Engine | Notes |
+|---|---|---|
+| `chromium-desktop` | Chromium | Chrome / Brave / Edge |
+| `firefox-desktop` | Gecko | Firefox |
+| `webkit-desktop` | WebKit | Safari on macOS |
+| `chrome-android` | Chromium | Pixel 5 emulation (touch, mobile UA) |
+| `safari-ios` | WebKit | iPhone 13 emulation — proxy for iOS Safari |
+| `firefox-mobileviewport` | Gecko | Mobile **viewport only** (Playwright Firefox has no touch/isMobile emulation) |
+
+WebKit is the engine behind Safari and **every** iOS browser, so the WebKit
+projects are our stand-in for the Apple ecosystem without a Mac in the loop.
+They are not a perfect substitute for real Safari/iOS (notably print dialog
+behavior and clipboard gesture rules), so a real-device pass is still worth
+doing before a release.
+
+The specs in [`flyer.spec.js`](flyer.spec.js) check the genuinely
+engine-sensitive surfaces:
+
+- default flyer renders with **no uncaught JS / console errors**
+- `@media print` hides the app chrome and keeps the flyer (a print-media
+  screenshot of the sheet is attached per engine for visual diffing)
+- anonymous key generation works (the **WebCrypto** path)
+- the legacy `/nostr/` redirect preserves the query string and `#hash`
+- an event-lookup URL shows the localized loading state, never the default flyer
+
+## Running
+
+```bash
+npm install
+npx playwright install            # download Chromium, Firefox, WebKit
+npm run test:e2e                  # all projects
+npx playwright test --project=firefox-desktop   # one engine
+npm run report                    # open the HTML report (with print screenshots)
+```
+
+Playwright starts and stops the static server itself (`python3 -m http.server`),
+so you do not need a server running first.
+
+### Linux: WebKit system dependency
+
+On a fresh Linux box WebKit needs extra system libraries. If the WebKit
+projects fail to launch, install them once:
+
+```bash
+sudo npx playwright install-deps   # or: sudo apt-get install -y libavif16
+```
+
+The Chromium and Firefox projects run without this step.
diff --git a/e2e/flyer.spec.js b/e2e/flyer.spec.js
new file mode 100644
index 0000000..e543abe
--- /dev/null
+++ b/e2e/flyer.spec.js
@@ -0,0 +1,89 @@
+// @ts-check
+const { test, expect } = require("@playwright/test");
+
+// These run once per project (engine/device) defined in playwright.config.js,
+// so every assertion below is validated on Chromium, Firefox, WebKit, and the
+// Android/iOS mobile emulations.
+
+/** Collect uncaught errors + console.error so we can fail on JS that only one
+ *  engine throws (the classic "works in Chrome" trap). */
+function trackErrors(page) {
+  const errors = [];
+  page.on("pageerror", (e) => errors.push(`pageerror: ${e.message}`));
+  page.on("console", (m) => {
+    if (m.type() === "error") errors.push(`console.error: ${m.text()}`);
+  });
+  return errors;
+}
+
+test.describe("VoxVera static client", () => {
+  test("loads the default flyer with no JS errors", async ({ page }) => {
+    const errors = trackErrors(page);
+    await page.goto("/");
+    const sheet = page.locator("#flyer-preview .container").first();
+    await expect(sheet).toBeVisible();
+    // Default sample content should render on the bare URL.
+    await expect(page.locator(".content h1").first()).toContainText("TOP SECRET");
+    // A real Letter sheet is taller than it is wide.
+    const box = await sheet.boundingBox();
+    expect(box && box.height).toBeGreaterThan(box ? box.width : 0);
+    expect(errors, errors.join("\n")).toHaveLength(0);
+  });
+
+  test("print media hides app chrome and keeps the flyer", async ({ page }, testInfo) => {
+    await page.goto("/");
+    await page.emulateMedia({ media: "print" });
+    // App header/toolbars must not print.
+    await expect(page.locator("body > header")).toBeHidden();
+    const sheet = page.locator(".container").first();
+    await expect(sheet).toBeVisible();
+    // Attach the printed-media render of the sheet for visual cross-engine diff.
+    const shot = await sheet.screenshot();
+    await testInfo.attach(`print-${testInfo.project.name}`, { body: shot, contentType: "image/png" });
+  });
+
+  test("generates an anonymous npub (WebCrypto path)", async ({ page }) => {
+    const errors = trackErrors(page);
+    // The identity controls live in the editor panel (hidden in viewer mode).
+    await page.goto("/#editor");
+    await page.locator("#generate-anon-identity").click();
+    await expect(page.locator("#author-npub-output")).toContainText(/^npub1[0-9a-z]+/);
+    expect(errors, errors.join("\n")).toHaveLength(0);
+  });
+
+  test("legacy /nostr/ redirect preserves query + hash", async ({ page }) => {
+    await page.goto("/nostr/?ref=qr#hello");
+    await page.waitForURL((url) => url.pathname === "/" && url.hash === "#hello");
+    expect(new URL(page.url()).pathname).toBe("/");
+    expect(new URL(page.url()).search).toBe("?ref=qr");
+    expect(new URL(page.url()).hash).toBe("#hello");
+  });
+
+  test("event-lookup URL shows the loading state, not default content", async ({ page }) => {
+    await page.goto("/");
+    // Build a well-formed naddr in-page so we don't depend on the network.
+    const naddr = await page.evaluate(() => {
+      const t = window.NostrTools;
+      return t.nip19.naddrEncode({
+        identifier: "voxvera:crossbrowser-smoke",
+        pubkey: "0".repeat(64),
+        kind: 30078,
+        relays: []
+      });
+    });
+    expect(naddr).toMatch(/^naddr1/);
+    // Navigating to the fragment should immediately swap in the localized
+    // "Loading content..." placeholder rather than the default TOP SECRET flyer.
+    // Go via about:blank so this is a full document load (a bare #hash change
+    // on the same URL would not re-run the URL-event handler).
+    await page.goto("about:blank");
+    await page.goto(`/#${naddr}`);
+    // The default flyer (with its h1 headings) must never appear; only the
+    // status placeholder. Accept either loading or the eventual load-failed
+    // message, since the offline fetch may resolve before we assert.
+    await expect(page.locator(".flyer-status-message")).toContainText(
+      /Loading content|Could not load this flyer/i
+    );
+    await expect(page.locator(".content h1")).toHaveCount(0);
+  });
+});
diff --git a/package-lock.json b/package-lock.json
new file mode 100644
index 0000000..0e78d07
--- /dev/null
+++ b/package-lock.json
@@ -0,0 +1,78 @@
+{
+  "name": "voxvera-e2e",
+  "version": "1.0.0",
+  "lockfileVersion": 3,
+  "requires": true,
+  "packages": {
+    "": {
+      "name": "voxvera-e2e",
+      "version": "1.0.0",
+      "devDependencies": {
+        "@playwright/test": "^1.49.0"
+      }
+    },
+    "node_modules/@playwright/test": {
+      "version": "1.60.0",
+      "resolved": "https://registry.npmjs.org/@playwright/test/-/test-1.60.0.tgz",
+      "integrity": "sha512-O71yZIbAh/PxDMNGns37GHBIfrVkEVyn+AXyIa5dOTfb4/xNvRWV+Vv/NMbNCtODB/pO7vLlF2OTmMVLhmr7Ag==",
+      "dev": true,
+      "license": "Apache-2.0",
+      "dependencies": {
+        "playwright": "1.60.0"
+      },
+      "bin": {
+        "playwright": "cli.js"
+      },
+      "engines": {
+        "node": ">=18"
+      }
+    },
+    "node_modules/fsevents": {
+      "version": "2.3.2",
+      "resolved": "https://registry.npmjs.org/fsevents/-/fsevents-2.3.2.tgz",
+      "integrity": "sha512-xiqMQR4xAeHTuB9uWm+fFRcIOgKBMiOBP+eXiyT7jsgVCq1bkVygt00oASowB7EdtpOHaaPgKt812P9ab+DDKA==",
+      "dev": true,
+      "hasInstallScript": true,
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "darwin"
+      ],
+      "engines": {
+        "node": "^8.16.0 || ^10.6.0 || >=11.0.0"
+      }
+    },
+    "node_modules/playwright": {
+      "version": "1.60.0",
+      "resolved": "https://registry.npmjs.org/playwright/-/playwright-1.60.0.tgz",
+      "integrity": "sha512-hheHdokM8cdqCb0lcE3s+zT4t4W+vvjpGxsZlDnikarzx8tSzMebh3UiFtgqwFwnTnjYQcsyMF8ei2mCO/tpeA==",
+      "dev": true,
+      "license": "Apache-2.0",
+      "dependencies": {
+        "playwright-core": "1.60.0"
+      },
+      "bin": {
+        "playwright": "cli.js"
+      },
+      "engines": {
+        "node": ">=18"
+      },
+      "optionalDependencies": {
+        "fsevents": "2.3.2"
+      }
+    },
+    "node_modules/playwright-core": {
+      "version": "1.60.0",
+      "resolved": "https://registry.npmjs.org/playwright-core/-/playwright-core-1.60.0.tgz",
+      "integrity": "sha512-9bW6zvX/m0lEbgTKJ6YppOKx8H3VOPBMOCFh2irXFOT4BbHgrx5hPjwJYLT40Lu+4qtD36qKc/Hn56StUW57IA==",
+      "dev": true,
+      "license": "Apache-2.0",
+      "bin": {
+        "playwright-core": "cli.js"
+      },
+      "engines": {
+        "node": ">=18"
+      }
+    }
+  }
+}
diff --git a/package.json b/package.json
new file mode 100644
index 0000000..3d2a634
--- /dev/null
+++ b/package.json
@@ -0,0 +1,14 @@
+{
+  "name": "voxvera-e2e",
+  "version": "1.0.0",
+  "private": true,
+  "description": "Cross-browser end-to-end tests for the VoxVera static Nostr flyer client.",
+  "scripts": {
+    "test:e2e": "playwright test",
+    "test:e2e:headed": "playwright test --headed",
+    "report": "playwright show-report"
+  },
+  "devDependencies": {
+    "@playwright/test": "^1.49.0"
+  }
+}
diff --git a/playwright.config.js b/playwright.config.js
new file mode 100644
index 0000000..0c1764f
--- /dev/null
+++ b/playwright.config.js
@@ -0,0 +1,52 @@
+// @ts-check
+const { defineConfig, devices } = require("@playwright/test");
+
+// Cross-browser + cross-device coverage for the static client. The same site
+// is exercised on each desktop engine (Chromium/Firefox/WebKit) and on mobile
+// emulations (Android Chrome, iOS Safari, and a mobile-viewport Firefox).
+//
+// WebKit is the engine behind Safari (macOS) and every iOS browser, so the
+// `webkit` and `Mobile Safari` projects are our proxy for the Apple ecosystem
+// without a Mac in the loop. Playwright manages the static server itself.
+
+const PORT = 8799;
+
+module.exports = defineConfig({
+  testDir: "./e2e",
+  timeout: 30000,
+  expect: { timeout: 7000 },
+  fullyParallel: true,
+  forbidOnly: !!process.env.CI,
+  reporter: [["list"], ["html", { open: "never" }]],
+  use: {
+    baseURL: `http://127.0.0.1:${PORT}`,
+    trace: "on-first-retry",
+    screenshot: "only-on-failure"
+  },
+  webServer: {
+    command: `python3 -m http.server ${PORT} --directory site`,
+    url: `http://127.0.0.1:${PORT}/`,
+    reuseExistingServer: !process.env.CI,
+    timeout: 30000
+  },
+  projects: [
+    // ---- Desktop engines ----
+    { name: "chromium-desktop", use: { ...devices["Desktop Chrome"] } },
+    { name: "firefox-desktop", use: { ...devices["Desktop Firefox"] } },
+    { name: "webkit-desktop", use: { ...devices["Desktop Safari"] } },
+
+    // ---- Mobile emulations ----
+    { name: "chrome-android", use: { ...devices["Pixel 5"] } },
+    { name: "safari-ios", use: { ...devices["iPhone 13"] } },
+
+    // Playwright's Firefox engine does not support touch/isMobile device
+    // descriptors, so this is a mobile-viewport layout check only (no touch).
+    {
+      name: "firefox-mobileviewport",
+      use: {
+        ...devices["Desktop Firefox"],
+        viewport: { width: 412, height: 915 }
+      }
+    }
+  ]
+});