diff --git a/src/commands/apps/bundles/create.ts b/src/commands/apps/bundles/create.ts
index 50971ab..4d26a19 100644
--- a/src/commands/apps/bundles/create.ts
+++ b/src/commands/apps/bundles/create.ts
@@ -9,7 +9,9 @@ import appsService from '../../../services/apps';
 import appBundlesService from '../../../services/app-bundles';
 import { getMessageFromUnknownError } from '../../../utils/error';
 import { createHash } from '../../../utils/hash';
-import { createBuffer } from '../../../utils/buffer';
+import { createBuffer, createBufferFromPath } from '../../../utils/buffer';
+import { createSignature } from '../../../utils/signature';
+import { fileExistsAtPath } from '../../../utils/file';
 
 export default defineCommand({
   meta: {
@@ -44,6 +46,10 @@ export default defineCommand({
       type: 'string',
       description: 'Path to the bundle to upload. Must be a folder (e.g. `www` or `dist`) or a zip file.',
     },
+    privateKey: {
+      type: 'string',
+      description: 'The path to the private key file to sign the bundle with.',
+    },
     rollout: {
       type: 'string',
       description: 'The percentage of devices to deploy the bundle to. Must be a number between 0 and 1 (e.g. 0.5).',
@@ -59,7 +65,7 @@ export default defineCommand({
       return;
     }
 
-    const { androidMax, androidMin, rollout, iosMax, iosMin } = ctx.args;
+    const { androidMax, androidMin, privateKey, rollout, iosMax, iosMin } = ctx.args;
     let appId = ctx.args.appId;
     let channelName = ctx.args.channel;
     let path = ctx.args.path;
@@ -92,22 +98,41 @@ export default defineCommand({
         }
       }
     }
+    let privateKeyBuffer;
+    if (privateKey) {
+      if (privateKey.endsWith('.pem')) {
+        const fileExists = await fileExistsAtPath(privateKey);
+        if (fileExists) {
+          privateKeyBuffer = await createBufferFromPath(privateKey);
+        } else {
+          consola.error('Private key file not found.');
+          return;
+        }
+      } else {
+        consola.error('Private key must be a path to a .pem file.');
+        return;
+      }
+    }
 
     // Create form data
     const formData = new FormData();
     if (path) {
+      let fileBuffer;
       if (zip.isZipped(path)) {
         const readStream = createReadStream(path);
-        const buffer = await createBuffer(readStream);
-        const hash = await createHash(buffer);
-        formData.append('file', buffer, { filename: 'bundle.zip' });
-        formData.append('checksum', hash);
+        fileBuffer = await createBuffer(readStream);
       } else {
         consola.start('Zipping folder...');
-        const zipBuffer = await zip.zipFolder(path);
-        const hash = await createHash(zipBuffer);
-        formData.append('file', zipBuffer, { filename: 'bundle.zip' });
-        formData.append('checksum', hash);
+        fileBuffer = await zip.zipFolder(path);
+      }
+      consola.start('Generating checksum...');
+      const hash = await createHash(fileBuffer);
+      formData.append('file', fileBuffer, { filename: 'bundle.zip' });
+      formData.append('checksum', hash);
+      if (privateKeyBuffer) {
+        consola.start('Signing bundle...');
+        const signature = await createSignature(privateKeyBuffer, fileBuffer);
+        formData.append('signature', signature);
       }
     }
     if (url) {
diff --git a/src/utils/buffer.ts b/src/utils/buffer.ts
index b296d81..0abc1ad 100644
--- a/src/utils/buffer.ts
+++ b/src/utils/buffer.ts
@@ -15,3 +15,9 @@ export const createBuffer = async (data: ReadStream): Promise<Buffer> => {
     data.on('error', reject);
   });
 };
+
+export const createBufferFromPath = async (path: string): Promise<Buffer> => {
+  const fs = await import('fs');
+  const stream = fs.createReadStream(path);
+  return createBuffer(stream);
+};
diff --git a/src/utils/file.ts b/src/utils/file.ts
new file mode 100644
index 0000000..4f441a0
--- /dev/null
+++ b/src/utils/file.ts
@@ -0,0 +1,8 @@
+export const fileExistsAtPath = async (path: string): Promise<boolean> => {
+  const fs = await import('fs');
+  return new Promise((resolve) => {
+    fs.access(path, fs.constants.F_OK, (err) => {
+      resolve(!err);
+    });
+  });
+};
diff --git a/src/utils/signature.ts b/src/utils/signature.ts
new file mode 100644
index 0000000..1184bb2
--- /dev/null
+++ b/src/utils/signature.ts
@@ -0,0 +1,7 @@
+export const createSignature = async (privateKey: Buffer, data: Buffer): Promise<string> => {
+  const crypto = await import('crypto');
+  const sign = crypto.createSign('sha256');
+  sign.update(data);
+  sign.end();
+  return sign.sign(privateKey).toString('base64');
+};