diff --git a/.changeset/feat-libreoffice-extension.md b/.changeset/feat-libreoffice-extension.md
new file mode 100644
index 00000000000..ac1da2ddf96
--- /dev/null
+++ b/.changeset/feat-libreoffice-extension.md
@@ -0,0 +1,8 @@
+---
+"@trigger.dev/build": minor
+"references/libreoffice-convert": patch
+---
+
+feat(build): add `libreoffice()` build extension for docx/pptx to PDF conversion
+
+Adds a `libreoffice(options?)` BuildExtension that installs LibreOffice system packages and `libreoffice-convert` npm package at deploy time, enabling direct Office-to-PDF conversion in Trigger.dev tasks.
diff --git a/packages/build/src/extensions/core.ts b/packages/build/src/extensions/core.ts
index 62671dfd571..971cf83ca68 100644
--- a/packages/build/src/extensions/core.ts
+++ b/packages/build/src/extensions/core.ts
@@ -5,3 +5,5 @@ export * from "./core/aptGet.js";
 export * from "./core/ffmpeg.js";
 export * from "./core/neonSyncEnvVars.js";
 export * from "./core/vercelSyncEnvVars.js";
+export * from "./core/syncSupabaseEnvVars.js";
+export * from "./core/libreoffice.js";
diff --git a/packages/build/src/extensions/core/libreoffice.ts b/packages/build/src/extensions/core/libreoffice.ts
new file mode 100644
index 00000000000..87eaa2458ae
--- /dev/null
+++ b/packages/build/src/extensions/core/libreoffice.ts
@@ -0,0 +1,109 @@
+import { BuildExtension } from "@trigger.dev/core/v3/build";
+import { dirname } from "node:path";
+import { readPackageJSON } from "pkg-types";
+
+export type LibreOfficeOptions = {
+  /**
+   * Use the minimal LibreOffice writer package (libreoffice-writer) instead of full LibreOffice.
+   * Sufficient for docx/pptx/xlsx to PDF conversion. Saves ~400MB vs. full install.
+   * @default false
+   */
+  minimal?: boolean;
+};
+
+/**
+ * Build extension that installs LibreOffice for docx/pptx/xlsx → PDF conversion.
+ *
+ * Adds the `libreoffice-convert` npm package and the required system packages
+ * to the Docker build image. The extension is scoped to "deploy" target only
+ * (dev uses the host machine's LibreOffice if available).
+ *
+ * @example
+ * ```ts
+ * // In trigger.config.ts
+ * import { libreoffice } from "@trigger.dev/build/extensions/core";
+ *
+ * build: {
+ *   extensions: [
+ *     libreoffice(),
+ *   ]
+ * }
+ * ```
+ *
+ * Then in your task:
+ * ```ts
+ * import libreofficeConvert from "libreoffice-convert";
+ * // Convert docx → PDF
+ * const pdfBuffer = await libreofficeConvert(docxBuffer, "pdf");
+ * ```
+ */
+export function libreoffice(options: LibreOfficeOptions = {}): BuildExtension {
+  const { minimal = false } = options;
+
+  // The npm package used for conversion
+  const NPM_PACKAGE = "libreoffice-convert";
+
+  return {
+    name: "libreoffice",
+
+    async onBuildStart(context) {
+      if (context.target !== "deploy") {
+        return;
+      }
+
+      // ── System packages (apt) ─────────────────────────────────────────────
+      // `aptGet` is defined in the same core directory.
+      // We delegate to it by registering an apt-get layer.
+      const systemPackages = minimal
+        ? [
+            "libreoffice-writer",
+            "libreoffice-calc",
+            "libreoffice-impress",
+            "fonts-liberation",
+            "--no-install-recommends",
+          ]
+        : [
+            "libreoffice",
+            "--no-install-recommends",
+          ];
+
+      context.addLayer({
+        id: "libreoffice-apt",
+        image: {
+          pkgs: systemPackages,
+        },
+      });
+
+      // ── npm package ────────────────────────────────────────────────────────
+      // Resolve the locally installed version of libreoffice-convert if present,
+      // otherwise fall back to "latest".
+      let version = "latest";
+      try {
+        const modulePath = await context.resolvePath(NPM_PACKAGE);
+        if (modulePath) {
+          const packageJSON = await readPackageJSON(dirname(modulePath));
+          version = packageJSON.version ?? "latest";
+          context.logger.debug(
+            `[libreoffice] Resolved ${NPM_PACKAGE} version: ${version}`
+          );
+        }
+      } catch (error) {
+        context.logger.debug(
+          `[libreoffice] Could not resolve ${NPM_PACKAGE} version, using "latest"`,
+          { error }
+        );
+      }
+
+      context.addLayer({
+        id: "libreoffice-npm",
+        dependencies: {
+          [NPM_PACKAGE]: version,
+        },
+      });
+
+      context.logger.debug(
+        `[libreoffice] Added LibreOffice layer (minimal=${minimal})`
+      );
+    },
+  };
+}
\ No newline at end of file
diff --git a/references/libreoffice-convert/.gitignore b/references/libreoffice-convert/.gitignore
new file mode 100644
index 00000000000..c2658d7d1b3
--- /dev/null
+++ b/references/libreoffice-convert/.gitignore
@@ -0,0 +1 @@
+node_modules/
diff --git a/references/libreoffice-convert/package.json b/references/libreoffice-convert/package.json
new file mode 100644
index 00000000000..e6feac1bfe8
--- /dev/null
+++ b/references/libreoffice-convert/package.json
@@ -0,0 +1,18 @@
+{
+  "name": "references-libreoffice-convert",
+  "private": true,
+  "type": "module",
+  "devDependencies": {
+    "trigger.dev": "workspace:*"
+  },
+  "dependencies": {
+    "@trigger.dev/build": "workspace:*",
+    "@trigger.dev/sdk": "workspace:*",
+    "libreoffice-convert": "^1.4.3",
+    "zod": "3.25.76"
+  },
+  "scripts": {
+    "dev": "trigger dev",
+    "deploy": "trigger deploy"
+  }
+}
\ No newline at end of file
diff --git a/references/libreoffice-convert/src/index.ts b/references/libreoffice-convert/src/index.ts
new file mode 100644
index 00000000000..30707490e72
--- /dev/null
+++ b/references/libreoffice-convert/src/index.ts
@@ -0,0 +1,41 @@
+import { createTask } from "@trigger.dev/sdk/v3";
+import libreofficeConvert from "libreoffice-convert";
+import { z } from "zod";
+
+/**
+ * Task that converts Office documents (docx, pptx, xlsx) to PDF using LibreOffice.
+ * Requires the `libreoffice()` build extension in trigger.config.ts.
+ *
+ * @example
+ * ```ts
+ * await client.tasks.call("libreoffice-convert", {
+ *   params: {
+ *     input: docxBuffer,   // Buffer containing the Office document
+ *     outputFormat: "pdf",  // Output format (default: "pdf")
+ *   }
+ * });
+ * ```
+ */
+export const libreofficeConvertTask = createTask({
+  rpc: "libreoffice/convert",
+  queue: {
+    name: "libreoffice-convert",
+    parallelLimit: 2,
+  },
+  schema: z.object({
+    /** Buffer containing the Office document (docx, pptx, xlsx) */
+    input: z.string().describe("Base64-encoded document buffer"),
+    /** Output format. Only "pdf" is supported by libreoffice-convert. */
+    outputFormat: z.string().optional().default("pdf"),
+  }),
+  async run(params): Promise<{ output: string }> {
+    const inputBuffer = Buffer.from(params.input, "base64");
+    const format = (params.outputFormat || "pdf") as Parameters<typeof libreofficeConvert>[1];
+
+    const pdfBuffer = await libreofficeConvert(inputBuffer, format);
+
+    return {
+      output: pdfBuffer.toString("base64"),
+    };
+  },
+});
\ No newline at end of file
diff --git a/references/libreoffice-convert/trigger.config.ts b/references/libreoffice-convert/trigger.config.ts
new file mode 100644
index 00000000000..8cb1ae9bc6d
--- /dev/null
+++ b/references/libreoffice-convert/trigger.config.ts
@@ -0,0 +1,15 @@
+import { defineConfig } from "@trigger.dev/sdk/v3";
+import { syncEnvVars } from "@trigger.dev/build/extensions/core";
+import { libreoffice } from "@trigger.dev/build/extensions/core";
+
+export default defineConfig({
+  compatibilityFlags: ["run_engine_v2"],
+  project: "proj_rrkpdguyagvsoktglnod",
+  logLevel: "debug",
+  build: {
+    extensions: [
+      syncEnvVars(),
+      libreoffice(),
+    ],
+  },
+});
\ No newline at end of file
diff --git a/references/libreoffice-convert/tsconfig.json b/references/libreoffice-convert/tsconfig.json
new file mode 100644
index 00000000000..9a5ee0b9d68
--- /dev/null
+++ b/references/libreoffice-convert/tsconfig.json
@@ -0,0 +1,15 @@
+{
+  "compilerOptions": {
+    "target": "ES2023",
+    "module": "Node16",
+    "moduleResolution": "Node16",
+    "esModuleInterop": true,
+    "strict": true,
+    "skipLibCheck": true,
+    "customConditions": ["@triggerdotdev/source"],
+    "jsx": "preserve",
+    "lib": ["DOM", "DOM.Iterable"],
+    "noEmit": true
+  },
+  "include": ["./src/**/*.ts", "trigger.config.ts"]
+}