diff --git a/.babelrc b/.babelrc
new file mode 100644
index 0000000..1320b9a
--- /dev/null
+++ b/.babelrc
@@ -0,0 +1,3 @@
+{
+  "presets": ["@babel/preset-env"]
+}
diff --git a/.eslintrc.cjs b/.eslintrc.cjs
index 03e137e..24c8715 100644
--- a/.eslintrc.cjs
+++ b/.eslintrc.cjs
@@ -2,6 +2,7 @@ module.exports = {
   env: {
     es2021: true,
     node: true,
+    jest: true,
   },
   extends: ["eslint:recommended", "prettier"],
   plugins: ["prettier"],
diff --git a/__tests__/utils/utils.test.js b/__tests__/utils/utils.test.js
new file mode 100644
index 0000000..cc4eab5
--- /dev/null
+++ b/__tests__/utils/utils.test.js
@@ -0,0 +1,20 @@
+import { jsonToSrt } from "../../src/utils/utils.js";
+
+describe("utils", () => {
+  it("conver YandexSubtitles json to srt", () => {
+    const jsonYS = [
+      { text: "Привет", startMs: 2222.0, durationMs: 3610.0 },
+      { text: "мир", startMs: 26050.0, durationMs: 970.0 },
+    ];
+
+    const expectedSRT = `1
+00:00:02,222 --> 00:00:05,832
+Привет
+
+2
+00:00:26,050 --> 00:00:27,020
+мир`;
+
+    expect(jsonToSrt(jsonYS)).toBe(expectedSRT);
+  });
+});
diff --git a/package.json b/package.json
index 453253c..880e629 100644
--- a/package.json
+++ b/package.json
@@ -10,7 +10,8 @@
     "lint": "npx eslint .",
     "lint-fix": "npx eslint . --fix",
     "format": "prettier --write --ignore-unknown \"src/**/*.{js,ts,json}\"",
-    "prepare": "husky"
+    "prepare": "husky",
+    "test": "jest"
   },
   "repository": {
     "type": "git",
@@ -44,10 +45,14 @@
     "uuid": "^10.0.0"
   },
   "devDependencies": {
+    "@babel/core": "^7.24.9",
+    "@babel/preset-env": "^7.24.8",
+    "babel-jest": "^29.7.0",
     "eslint": "^8.56.0",
     "eslint-config-prettier": "^9.1.0",
     "eslint-plugin-prettier": "^5.1.3",
     "husky": "^9.0.11",
+    "jest": "^29.7.0",
     "prettier": "^3.3.2"
   }
 }
diff --git a/src/download.js b/src/download.js
index cede1a2..ec6e190 100644
--- a/src/download.js
+++ b/src/download.js
@@ -1,5 +1,7 @@
 import fs from "fs";
+import { Writable } from "stream";
 import axios from "axios";
+import { jsonToSrt } from "./utils/utils.js";
 
 function calcPercents(current, max) {
   return ((current / max) * 100).toFixed(1);
@@ -9,7 +11,7 @@ export default async function downloadFile(url, outputPath, subtask, videoId) {
   if (!url) {
     throw new Error("Invalid download link");
   }
-
+  const IS_NEED_CONVERT = outputPath.endsWith(".srt");
   const writer = fs.createWriteStream(outputPath);
   const { data, headers } = await axios({
     method: "get",
@@ -31,7 +33,23 @@ export default async function downloadFile(url, outputPath, subtask, videoId) {
     // console.log(calcPercents(downloadedLength, totalLength))
   });
 
-  data.pipe(writer);
+  if (IS_NEED_CONVERT) {
+    let dataBuffer = "";
+    const writableStream = new Writable({
+      write(chunk, encoding, callback) {
+        dataBuffer += chunk.toString();
+        callback();
+      },
+    });
+    data.pipe(writableStream);
+    data.on("end", () => {
+      const jsonData = JSON.parse(dataBuffer);
+      writer.write(jsonToSrt(jsonData["subtitles"]));
+      writer.end();
+    });
+  } else {
+    data.pipe(writer);
+  }
 
   return new Promise((resolve, reject) => {
     writer.on("finish", resolve);
diff --git a/src/index.js b/src/index.js
index 3cabcaa..e963619 100644
--- a/src/index.js
+++ b/src/index.js
@@ -49,7 +49,9 @@ const argv = parseArgs(process.argv.slice(2));
 const ARG_LINKS = argv._;
 const OUTPUT_DIR = argv.output;
 const OUTPUT_FILE = argv["output-file"];
-const IS_SUBS_REQ = argv.subs || argv.subtitles;
+const IS_SUBS_FORMAT_SRT = argv["subs-srt"] || argv["subtitles-srt"];
+const RESPONSE_SUBTITLES_FORMAT = IS_SUBS_FORMAT_SRT ? "srt" : "json";
+const IS_SUBS_REQ = argv.subs || argv.subtitles || IS_SUBS_FORMAT_SRT;
 const ARG_HELP = argv.help || argv.h;
 const ARG_VERSION = argv.version || argv.v;
 const PROXY_STRING = argv.proxy;
@@ -398,12 +400,12 @@ async function main() {
 
                   const taskSubTitle = `(ID: ${videoId})`;
                   const filename = OUTPUT_FILE
-                    ? OUTPUT_FILE.endsWith(".json")
+                    ? OUTPUT_FILE.endsWith(`.${RESPONSE_SUBTITLES_FORMAT}`)
                       ? OUTPUT_FILE
-                      : `${OUTPUT_FILE}.json`
+                      : `${OUTPUT_FILE}.${RESPONSE_SUBTITLES_FORMAT}`
                     : `${subOnReqLang.language}---${clearFileName(
                         videoId,
-                      )}---${uuidv4()}.json`;
+                      )}---${uuidv4()}.${RESPONSE_SUBTITLES_FORMAT}`;
                   await downloadFile(
                     subOnReqLang.url,
                     `${OUTPUT_DIR}/${filename}`,
diff --git a/src/utils/utils.js b/src/utils/utils.js
index b18e25a..5ef71da 100644
--- a/src/utils/utils.js
+++ b/src/utils/utils.js
@@ -2,4 +2,25 @@ function clearFileName(name) {
   return name.replace(/[^\w.-]/g, "");
 }
 
-export { clearFileName };
+function convertToSrtTimeFormat(ms) {
+  const date = new Date(ms);
+  const hours = String(date.getUTCHours()).padStart(2, "0");
+  const minutes = String(date.getUTCMinutes()).padStart(2, "0");
+  const seconds = String(date.getUTCSeconds()).padStart(2, "0");
+  const milliseconds = String(date.getUTCMilliseconds()).padStart(3, "0");
+  return `${hours}:${minutes}:${seconds},${milliseconds}`;
+}
+
+function jsonToSrt(subtitles) {
+  return subtitles
+    .map((s, index) => {
+      const { text, startMs, durationMs } = s;
+      const startTime = convertToSrtTimeFormat(startMs);
+      const endTime = convertToSrtTimeFormat(startMs + durationMs);
+      return `${index + 1}\n${startTime} --> ${endTime}\n${text}\n`;
+    })
+    .join("\n")
+    .trim();
+}
+
+export { clearFileName, jsonToSrt };