How to Add Subtitles into MP4 Videos in Detail

How to Add Subtitles into MP4 Videos in Detail

Selena Thomas

June 17, 2021 08:30Posted by to Edit Video, MP4

Movies are very important in modern people’s life. We may take the subtitles in the movies for granted. But as a movie maker, or when you downloaded a movie without subtitles, you will find it needed to add subtitles to MP4 by yourself. This article will talk about how to add subtitles to MP4 video and why you need to do so.

Add Subtitles into MP4

Part 1: Why You Need to Add Subtitles to MP4 Videos

1. Bring more views to your video posts

If you are going to post your MP4 video to social media platforms, it would be much better for you to add subtitles to your MP4 videos. You should know that not everyone turns on the audio. For instance, many people watch videos on the subway and don’t want to make any noise for the public. Some people even cannot hear your video sounds due to disability or noisy environments. More than that, subtitles can improve comprehension, especially when the speech in the video is at a high speed.

2. Help understand the language in the video

It is also possible that the MP4 movie you just downloaded from the Internet does not contain subtitles. Maybe you are learning a second language by watching movies in that language and badly rely on the subtitles. In this kind of case, you need to download and add subtitles to the MP4 videos. If your video becomes important and some people want to create subtitles in other languages for your video, basing on your original subtitle will make things easier.

3. For hardware and software that can’t use external subtitle files

Most machines and media player programs today are compatible with external subtitle files. But some old machines and software don’t. To make them play videos with subtitles, you can embed subtitles into the MP4 video. By doing so, the subtitles are like welded to the video and they cannot be separated. The subtitles become part of the images of the video like a watermark so that whenever the video is played, the subtitle will show with it.

Part 2: How to Add Subtitles to MP4 Videos

Before you post MP4 videos to social media platforms, how to add subtitles to them? The platforms won’t prompt you to upload a video file and a subtitle file respectively. Thus, you need to integrate subtitles into the MP4 videos.

Doing so involves subtitle tools. Here we will use Video Converter Ultimate. It is easy to use and powerful in customizing the subtitles.

Key Features

Steps to merge subtitles with MP4 video:

Step 1

Free download, install and launch Video Converter Ultimate on your Windows or Mac. When you see the interface, click the Add File(s) button in the top left corner of the interface. A file explorer or Finder window will pop up and you can import your video file using it.

Add file

Step 2

After importing your MP4 video, click to drop down the Subtitle menu for it. Then click the Add Subtitle button on the menu and open the subtitle file on your computer in the pop-up file explorer. If there is any subtitle pre-sealed in the video file, you can directly select it on the menu.

Find and Click Add Subtitle

Step 3 (Optional):

If you want to customize how your subtitle will look in the video, you can use the advanced subtitle feature in the program. In the main interface, click the Edit button on the file whose subtitle(s) you want to customize. Then head to the Subtitle tab at the top of the interface. Here you can customize the style of the subtitle before you encode subtitles to the MP4 video. The playback screen allows you to preview the embedded subtitle.

Subtitle Interface

Step 4

If you want to maintain the video as MP4 format, you need to set MP4 as the output format before you start recoding the subtitles and the video. Clicking the Convert All to drop-down button will prompt the output format menu. Find MP4 from the menu and click to set it as the output format.

Select Output Format as MP4

Step 5

At the bottom of the main interface, you can set the output destination. At last, you need to click the Convert button in the bottom right corner of the main interface to start integrating the subtitles into the MP4 video. When you see a notice informing you that the processing is completed successfully, you can go to the destination folder to view the output MP4 video.

Select destination and Click Convert All

Now, you have learned about how to add subtitles to MP4 video files. However, where do you get the subtitle from? Below are some recommendations.

5 Websites to download subtitles

Part 3: FAQs about Adding Subtitles to MP4 Video

What Subtitle File Format Should I Use?

As for external subtitles, it is recommended to use SRT format which is the most widely supported. Almost all video distribution platforms accept it.

Will adding subtitles reduce the video quality?

In most cases, it will not. Attaching soft subtitles to the video won’t change, recode or damage the video itself. However, burning in hard subtitles will recode the video, which damages the video quality. Moreover, the hard subtitle will cover part of the image permanently.

What are the differences between hard subtitles and soft subtitles?

Hard subtitles are also called burned-in subtitles. When they are burned into the video, they become part of it. You cannot make it disappear. Soft subtitles are hidden somewhere in the video file. You can turn on and turn off the subtitle and shift between multiple subtitles if there are.


You may want to add subtitles to your MP4 videos to get a better viewing experience for yourself or your video’s audience. This article introduced how to permanently add subtitles to MP4. Video Converter Ultimate is the best tool to do it. It also supports you to customize the font, color, outline, position and other settings for the subtitles. Have a free try now!

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