diff --git a/cli.py b/cli.py
index edf259a..a8e47e2 100644
--- a/cli.py
+++ b/cli.py
@@ -40,7 +40,7 @@ def serve(args):
     """serve the documentation and reload on changes"""
     parser = argparse.ArgumentParser(description='Serve the documentation and reload changes', prog="cli.py serve")
     parser.add_argument('-v', '--verbose', action='store_true', help='verbose mode')
-    parser.add_argument('-p', '--port', default=8000, help='port')
+    parser.add_argument('-p', '--port', default=3000, help='port')
     parser.add_argument('--update_issues', action='store_true', help='update issues')
     outDir = "build"
     issuePath = os.path.join(outDir,"issues.json")
@@ -68,11 +68,32 @@ def issueUpdate(args):
     issuePath = os.path.join(args.outDir,"issues.json")
     updateIssue(issuePath, args.verbose)
 
+def buildPdf(args):
+    parser = argparse.ArgumentParser(description='Print to pdf', prog="cli.py buildPdf")
+    parser.add_argument('-v', '--verbose', action='store_true', help='verbose mode')
+    parser.add_argument('--outDir', default="build/doc.pdf", help='output directory')
+    parser.add_argument('--browser-path', help='path to the browser')
+    args = parser.parse_args(args)
+    absPath = os.path.normpath(os.path.join( os.getcwd(),'book' , 'print.html' )).replace('\\', '/')
+    url = f"file://{absPath}"
+    if args.verbose:
+        print("build start")
+        print("print url", url)
+    cmd = ["deno", "run","--unstable" ,"-A","tools/printPdf.ts", "--outDir", args.outDir, "--url", url]
+    if args.browser_path:
+        cmd.append("--chromeDir")
+        cmd.append(args.browser_path)
+    if args.verbose:
+        print("cmd: ", " ".join(cmd))
+    p = subprocess.run(cmd)
+    p.check_returncode()
+
 commandList = {
     'build': build,
     'help': help,
     'issueUpdate': issueUpdate,
-    'serve': serve
+    'serve': serve,
+    'buildPdf': buildPdf
 }
 
 def main():
diff --git a/tools/printPdf.ts b/tools/printPdf.ts
new file mode 100644
index 0000000..1a935f0
--- /dev/null
+++ b/tools/printPdf.ts
@@ -0,0 +1,69 @@
+import puppeteer from "https://deno.land/x/puppeteer@9.0.2/mod.ts";
+import { parse as argParse } from "https://deno.land/std@0.136.0/flags/mod.ts";
+import {join as pathJoin} from "https://deno.land/std@0.136.0/path/mod.ts"; 
+
+const executablePathMap = {
+    windows: "C:\\Program Files (x86)\\Microsoft\\Edge\\Application\\msedge.exe",
+            //"C:\\Program Files (x86)\\Google\\Chrome\\Application\\chrome.exe",
+    darwin: "/Applications/Google Chrome.app/Contents/MacOS/Google Chrome",
+    linux: "/usr/bin/chromium-browser",
+};
+
+function findChromeDir(){
+    const dir = executablePathMap[Deno.build.os];
+    if (Deno.build.os === "linux"){
+        const pathes = Deno.env.get("PATH")?.split(";");
+        if(!pathes){
+            return dir;
+        }
+        for (const path of pathes){
+            const entries = [...Deno.readDirSync(path)];
+            const chrome = entries.find((entry) => entry.name === "chrome");
+            if(chrome) {
+                return pathJoin(path, chrome.name);
+            }
+        }
+    }
+    return dir;
+}
+
+async function main() {
+    const args = argParse(Deno.args);
+    let { url, outDir, chromeDir } = args;
+    if (!url) {
+        console.error("No url provided.");
+        Deno.exit(1);
+    }
+    outDir = outDir ?? "out.pdf";
+    if(!chromeDir) {
+        console.log("No chromeDir provided. Try to find chrome.");
+        chromeDir = findChromeDir();
+        console.log(`chromeDir: ${chromeDir}`);
+    }
+
+    const browser = await puppeteer.launch({
+        product: "chrome",
+        headless: true,
+        executablePath: chromeDir,
+    });
+
+    const page = await browser.newPage();
+    console.log(`goto url ${url}`);
+    await page.goto(url, {
+        waitUntil: "networkidle2",
+      });
+    await page.pdf({
+        path: outDir,
+        margin: {
+            bottom: "1cm",
+            left: "1cm",
+            right: "1cm",
+            top: "1cm",
+        }
+    });
+    await browser.close();
+}
+
+if (import.meta.main) {
+    main();
+}
\ No newline at end of file