diff --git a/src/lib/clean-pdf/__tests__/api-key.test.ts b/src/lib/clean-pdf/__tests__/api-key.test.ts
new file mode 100644
index 0000000..1c74a96
--- /dev/null
+++ b/src/lib/clean-pdf/__tests__/api-key.test.ts
@@ -0,0 +1,15 @@
+import { describe, expect, it } from "vitest";
+import { PDF_KEY_PREFIX, generatePdfKey } from "@/lib/clean-pdf/api-key";
+
+describe("generatePdfKey", () => {
+  it("формат sbpdf_<base64url>, достаточная длина", () => {
+    const key = generatePdfKey();
+    expect(key.startsWith(PDF_KEY_PREFIX)).toBe(true);
+    expect(key.length).toBeGreaterThanOrEqual(PDF_KEY_PREFIX.length + 32);
+    expect(key.slice(PDF_KEY_PREFIX.length)).toMatch(/^[A-Za-z0-9_-]+$/);
+  });
+
+  it("две генерации различаются", () => {
+    expect(generatePdfKey()).not.toBe(generatePdfKey());
+  });
+});
diff --git a/src/lib/clean-pdf/__tests__/zotero-script.test.ts b/src/lib/clean-pdf/__tests__/zotero-script.test.ts
new file mode 100644
index 0000000..22ca45f
--- /dev/null
+++ b/src/lib/clean-pdf/__tests__/zotero-script.test.ts
@@ -0,0 +1,12 @@
+import { describe, expect, it } from "vitest";
+import { buildZoteroScript } from "@/lib/clean-pdf/zotero-script";
+
+describe("buildZoteroScript", () => {
+  it("подставляет ключ и адрес школы", () => {
+    const s = buildZoteroScript({ apiKey: "sbpdf_test123", baseUrl: "https://school.second-brain.ru" });
+    expect(s).toContain("'sbpdf_test123'");
+    expect(s).toContain("'https://school.second-brain.ru'");
+    expect(s).toContain("/api/pdf?url=");
+    expect(s).not.toContain("YOUR_KEY");
+  });
+});
diff --git a/src/lib/clean-pdf/api-key.ts b/src/lib/clean-pdf/api-key.ts
new file mode 100644
index 0000000..4278ce1
--- /dev/null
+++ b/src/lib/clean-pdf/api-key.ts
@@ -0,0 +1,7 @@
+import { randomBytes } from "node:crypto";
+
+export const PDF_KEY_PREFIX = "sbpdf_";
+
+export function generatePdfKey(): string {
+  return PDF_KEY_PREFIX + randomBytes(24).toString("base64url");
+}
diff --git a/src/lib/clean-pdf/zotero-script.ts b/src/lib/clean-pdf/zotero-script.ts
new file mode 100644
index 0000000..bac113b
--- /dev/null
+++ b/src/lib/clean-pdf/zotero-script.ts
@@ -0,0 +1,80 @@
+// Адаптация скрипта Clean PDF (pdf.brainysnipe.ru/zotero-script.js) под школу.
+export function buildZoteroScript({ apiKey, baseUrl }: { apiKey: string; baseUrl: string }): string {
+  return `// ── Настройки ──────────────────────────────────────────────────────────────
+const API_KEY     = '${apiKey}'; // персональный ключ из school.second-brain.ru/tools/clean-pdf
+const SERVICE_URL = '${baseUrl}';
+const FORMAT      = 'A4';    // 'A4' или 'Letter'
+const THEME       = 'light'; // 'light' или 'dark'
+// ───────────────────────────────────────────────────────────────────────────
+
+if (typeof item === "undefined" || !item) return;
+(async function () {
+  let tempFilePath = null;
+  try {
+    function joinPath(dir, filename) {
+      if (typeof OS !== "undefined" && OS.Path && OS.Path.join) return OS.Path.join(dir, filename);
+      const separator = dir.includes("\\\\") ? "\\\\" : "/";
+      return dir.replace(/[\\\\/]+$/, "") + separator + filename;
+    }
+
+    let targetItem = item;
+    if (!targetItem.isRegularItem()) {
+      if (targetItem.isAttachment() || targetItem.isNote())
+        targetItem = Zotero.Items.get(targetItem.parentID);
+    }
+    if (!targetItem?.isRegularItem()) {
+      Zotero.alert(null, "Чистый PDF", "Выберите обычную запись Zotero.");
+      return;
+    }
+    const url = targetItem.getField("url");
+    if (!url) { Zotero.alert(null, "Чистый PDF", "У записи нет URL."); return; }
+
+    const pw = new Zotero.ProgressWindow();
+    pw.changeHeadline("Чистый PDF");
+    const progress = new pw.ItemProgress(targetItem.getImageSrc(), targetItem.getField("title"));
+    pw.show();
+    pw.addDescription("Генерируем PDF…");
+
+    const response = await Zotero.getMainWindow().fetch(
+      SERVICE_URL + "/api/pdf?url=" + encodeURIComponent(url) + "&format=" + FORMAT + "&theme=" + THEME,
+      { headers: { 'Authorization': 'Bearer ' + API_KEY } }
+    );
+    if (!response.ok) {
+      const body = await response.json().catch(() => ({}));
+      progress.setError();
+      pw.addDescription("Ошибка: " + (body.error || ("HTTP " + response.status)));
+      pw.startCloseTimer(8000);
+      return;
+    }
+
+    const uint8Array = new Uint8Array(await (await response.blob()).arrayBuffer());
+    if (uint8Array.length < 1000) {
+      progress.setError(); pw.addDescription("Пришёл пустой PDF."); pw.startCloseTimer(8000); return;
+    }
+
+    const safeTitle = (targetItem.getField("title") || "Document").replace(/[\\\\/:"*?<>|]+/g, "_").slice(0, 140);
+    tempFilePath = joinPath(Zotero.getTempDirectory().path, safeTitle + ".pdf");
+    await Zotero.getMainWindow().IOUtils.write(tempFilePath, uint8Array);
+    await Zotero.Attachments.importFromFile({ file: tempFilePath, parentItemID: targetItem.id, contentType: "application/pdf" });
+
+    for (const attId of targetItem.getAttachments()) {
+      const att = Zotero.Items.get(attId);
+      const ct = att?.attachmentContentType || "";
+      if (ct === "text/html" || ct === "application/zip") await att.eraseTx();
+    }
+
+    progress.setProgress(100);
+    const usesCount = response.headers.get('X-Uses-Count');
+    const maxUses   = response.headers.get('X-Max-Uses');
+    const usageInfo = (usesCount && maxUses) ? (" (" + usesCount + "/" + maxUses + " за месяц)") : "";
+    pw.addDescription("PDF прикреплён." + usageInfo);
+    pw.startCloseTimer(4000);
+  } catch (e) {
+    Zotero.alert(null, "Ошибка", e.toString());
+  } finally {
+    if (tempFilePath) {
+      await Zotero.getMainWindow().IOUtils.remove(tempFilePath, { ignoreAbsent: true }).catch(() => {});
+    }
+  }
+})();`;
+}